title: jsxShapeCreate date: 2016-09-28 12:21:20 tags: [jxggraph,shape]

形状create constructor JSXGraph元素篇

Angle 角度 JXG.GeometryElement -> JXG.Curve -> Sector -> angle

Defined in sector.js Extends Sector JXG.Board#create type:angle

param array p1----JXG.Point p2----JXG.Point p3----JXG.Point 以p2为角点 p1到p3的角度逆时针
example

  // Create an angle out of three free points 创建一个三个自由点的角度
  var p1 = board.create('point', [5.0, 3.0]),
  p2 = board.create('point', [1.0, 0.5]),
  p3 = board.create('point', [1.5, 5.0]),
  a = board.create('angle', [p1, p2, p3]);

这是创建一个角度的代码 A/B/C三点 A/C为控制角大小的点 B为实际的角度点

  // Create an angle out of three free points 从两条线和两个方向创建一个角度
  var p1 = board.create('point', [-1, 4]),
  p2 = board.create('point', [4, 1]),
  q1 = board.create('point', [-2, -3]),
  q2 = board.create('point', [4,3]),
  li1 = board.create('line', [p1,p2], {strokeColor:'black', lastArrow:true}),
  li2 = board.create('line', [q1,q2], {lastArrow:true}),
  a1 = board.create('angle', [li1, li2, [5.5, 0], [4, 3]], { radius:1 }),
  a2 = board.create('angle', [li1, li2, 1, -1], { radius:2 });

这是两条直线与点的夹角

  var p1, p2, p3, c, a, s;

  p1 = board.create('point',[0,0]);
  p2 = board.create('point',[5,0]);
  p3 = board.create('point',[0,5]);

  c1 = board.create('circle',[p1, p2]);

  a = board.create('angle',[p2, p1, p3], {radius:3});

  a.setAngle(function() {
      return Math.PI / 3;
  });
  board.update();

  var p1, p2, p3, c, a, s;

  p1 = board.create('point',[0,0]);
  p2 = board.create('point',[5,0]);
  p3 = board.create('point',[0,5]);

  c1 = board.create('circle',[p1, p2]);

  a = board.create('angle',[p2, p1, p3], {radius:3});
  s = board.create('slider',[[-2,1], [2,1], [0, Math.PI*0.5, 2*Math.PI]]);

  a.setAngle(function() {
      return s.Value();
  });
  board.update();

Attributes：
- orthoSensitivity
  default:1.0
- orthoType
  option value:sector/sectordot/square/none default:square
- radius 扇形半径 default:0.5
- type default:‘sector’
- 其他借用其他元素的属性：Sector、JXG.Curve、JXG.GeometryElement
Fields
- dot 预测一个直角
- point
- pointsquare
Methods
- free()
  释放一个由setAngle设置的角，转换为一个自由点 return （a object which） pointer to the angle element 返回一个指向这个角的对象
- setAngle(val) 设定一个角度以弧度为规定值。如果角的第三点，这是唯一可能的，即anglepoint是一个自由的点。
Events 借用其他元素的事件：JXG.GeometryElement

Arc 弧 JXG.GeometryElement -> JXG.Curve -> Curve -> Arc

Defined in arc.js Extends Curve

param array p1----JXG.Point p2----JXG.Point p3----JXG.Point 以p1位弧心从p2到p3的弧度逆时针
example

  // Create an arc out of three free points
  var p1 = board.create('point', [2.0, 2.0]);
  var p2 = board.create('point', [1.0, 0.5]);
  var p3 = board.create('point', [3.5, 1.0]);

  var a = board.create('arc', [p1, p2, p3]);

p1为弧度的中心点 p2到p3逆时针旋转

Attributes 借用其他元素的属性：Curve
Fields
- anglepoint
  这个点定义弧的度
- center 弧的中心点
- radiuspoint 这个点定义弧的半径
- 其他借用其他元素的属性：JXG.Curve、JXG.GeometryElement
Methods
- getRadius() 获取半径
- hasPointSector(x,y) 检查x，y这个点是否在定义的弧扇形内 x，y为屏幕坐标系
- Radius() 确定弧的当前半径
- value 返回弧长
- 其他借用其他元素的方法：JXG.Curve、JXG.GeometryElement
事件借用其他元素的事件：JXG.GeometryElement

Arraw 箭头 JXG.JXG.GeometryElement -> JXG.Line -> Arraw

Defined in line.js Extends JXG.line

param array point1---JXG.Point|array point2---JXG.Point|array 或者 a--------number b--------number c--------number ax + by + c*z = 0
example

  // Create an arrow providing two points.
  var p1 = board.create('point', [4.5, 2.0]);
  var p2 = board.create('point', [1.0, 1.0]);
  var l1 = board.create('arrow', [p1, p2]);

两点确定一条有方向的线 JXG.GeometryElement -> JXG.line -> Line -> parallel -> Arrowparallel

Attributes：借用其他元素的属性：JXG.GeometryElement
Fields 借用其他元素的字段：JXG.Line
Methods 借用其他元素的方法：JXG.Line、JXG.GeometryElement
Events 借用其他元素的事件：JXG.GeometryElement

Arrowparallel 平行箭头 JXG.GeometryElement -> JXG.Line -> Line -> Parallel -> Arrowparallel

Defined in composition.js Extends Parallel 这个元素没有构造器，需要通过 JXG.Board#create -> type:‘Arrowparallel’创建

param array l----JXG.Line p----JXG.Point

所构建的箭包含P和具有相同的斜率为l

example

  // Create a parallel
  var p1 = board.create('point', [0.0, 2.0]);
  var p2 = board.create('point', [2.0, 1.0]);
  var l1 = board.create('line', [p1, p2]);

  var p3 = board.create('point', [3.0, 3.0]);
  var pl1 = board.create('arrowparallel', [l1, p3]);

Attributes：借用其他元素的属性：Parallel、Line、JXG.GeometryElement
Fields 借用其他元素的字段：JXG.Line、JXG.GeometryElement
Methods 借用其他元素的方法：JXG.Line、JXG.GeometryElement
Events 借用其他元素的事件：JXG.GeometryElement

Axis 轴 JXG.GeometryElement -> JXG.Line -> Axis

Defined in line.js Extends JXG.Line 通过JXG.Board#Create type：‘axis’

param array point1----JXG.Line|array point2----JXG.Line|array 或者 a----number b----number c----number ax+by+c*c=0
example

  // Create an axis providing two coord pairs.
  var l1 = board.create('axis', [[0.0, 1.0], [1.0, 1.3]]);

Attributes
- label 轴的标签
- point1 轴的第一个点
- point2 轴的第二个点
- ticks 轴的记号
- 其他借用其他元素的属性：JXG.GeometryElement
Fields
- defaultTicks 附在轴上的记号
- 其他借用其他元素的字段：JXG.Line
Methods 借用其他元素的方法：JXG.Line
Events 借用其他元素的事件：JXG.GeometryElement

Bisector 二等分物（数二等分线） JXG.GeometryElement -> JXG.Line -> Bisector

Defined in composition.js Extends JXG.Line 这个元素没有构造函数通过JXG.Board#create type：‘bisector’创建

example

  var p1 = board.create('point', [6.0, 4.0]);
  var p2 = board.create('point', [3.0, 2.0]);
  var p3 = board.create('point', [1.0, 7.0]);

  var bi1 = board.create('bisector', [p1, p2, p3]);

Attributes
- point 平分线的辅助点
- 其他借用其他元素的属性：JXG.GeometryElement
Fields 借用其他元素的属性：JXG.Line
Methods 借用其他元素的属性：JXG.Line、JXG.GeometryElement
Events 借用其他元素的事件：JXG.GeometryElement

Bisectorlines 等分线 JXG.Composition -> Bisector

Defined in composition.js Extends JXG.Composition

param array l1----JXG.line l2----JXG.line throws: 如果不能由踢狗对象（两条线）构造会抛出一个异常
example

  var p1 = board.create('point', [6.0, 4.0]);
  var p2 = board.create('point', [3.0, 2.0]);
  var p3 = board.create('point', [1.0, 7.0]);
  var p4 = board.create('point', [3.0, 0.0]);
  var l1 = board.create('line', [p1, p2]);
  var l2 = board.create('line', [p3, p4]);

  var bi1 = board.create('bisectorlines', [l1, l2]);

Attributes
- line1 第一条线
- line2 第二条线
- 其他借用其他元素的属性：JXG.Composition
Fields
Methods
Events 借用其他元素：JXG.Composition

button 按钮 JXG.GeometryElement,JXG.CoordsElement -> JXG.Text -> Text -> Button

Defined button.js Extends Text
无直接构造器需要通过JXG.Board#create type:‘button’创建

param array x--------number | function y--------number | function label----label handle---function ps: X和Y是文本框的左下角的坐标。文本的位置是固定的， X和Y是数字。如果X或Y是函数，则该位置是可变的。 label 按钮里的内容 string handler optional 按钮按下的时候回调
example

  var p = board.create('point', [0.5, 0.5], {id: 'p1'});

  // Create a button element at position [1,2].
  var button1 = board.create('button', [1, 2, 'Change Y with JavaScript', function() {
      p.moveTo([p.X(), p.Y() + 0.5], 100);
  }], {});

  // Create a button element at position [1,4].
  var button2 = board.create('button', [1, 4, 'Change Y with JessieCode',
      "$('p1').Y = $('p1').Y() - 0.5;"
  ], {});

Attributes
- disabled HTML Button ‘disabled’ default:false
- 其他借用其他元素的属性：JXG.Text、JXG.GeometryElement、JXG.CoordsElement
Fields 借用其他元素的字段：JXG.GeometryElement
Methods 借用其他元素的方法：JXG.Text、JXG.Text、JXG.CoordsElement
Events 借用其他元素的事件：JXG.GeometryElement

Checkbox 多选框 JXG.GeometryElement,JXG.CoordsElement -> JXG.Text -> Text -> Checkbox

Defined in checkbox.js Extends Text 通过JXG.Board#create type:‘checkbox’创建

param x---------文本的左下角 x y 若为函数则位置可变
y---------文本的左下角 label-----文本显示
example

// Create a checkbox element at position [0,3].
var checkbox = board.create('checkbox', [0, 3, 'Change Y'], {});
var p = board.create('point', [
    function(){ return 0.5;}, // X-coordinate
    function() {
        y = 0.5;
        if (checkbox.Value()) {
            y += 0.5;
        }
        return y;
    }]);

var checkbox = board.create('checkbox', [0, 4, 'Click me']),
           p = board.create('point', [1, 1]);

JXG.addEvent(checkbox.rendNodeCheckbox, 'change', function() {
    if (this.Value()) {
        p.moveTo([4, 1]);
    } else {
        p.moveTo([1, 1]);
    }
}, checkbox);

Attributes
- disabled HTML Button ‘disabled’ default:false
- 其他借用其他元素的属性：JXG.Text、JXG.GeometryElement、JXG.CoordsElement
Fields 借用其他元素的字段：JXG.GeometryElement、JXG.CoordsElement
Methods 借用其他元素的方法：JXG.Text、JXG.Text、JXG.CoordsElement
Events 借用其他元素的事件：JXG.GeometryElement

Circle 圆 JXG.GeometryElement -> JXG.circle -> Circle

Defined in circle.js
Extends JXG.circle
JXG.Board#create type:'circle'

* param
center----JXG.Point 圆心
radius----number|JXG.Point|JXG.Line|JXG.Circle 半径：可为点或线或圆

* example
```javascript
// Create a circle providing two points
var p1 = board.create('point', [2.0, 2.0]),
    p2 = board.create('point', [2.0, 0.0]),
    c1 = board.create('circle', [p1, p2]);

// Create another circle using the above circle
var p3 = board.create('point', [3.0, 2.0]),
    c2 = board.create('circle', [p3, c1]);
```

```javascript
// Create a circle providing two points
var p1 = board.create('point', [2.0, 2.0]),
    c1 = board.create('circle', [p1, 3]);

// Create another circle using the above circle
var c2 = board.create('circle', [function() { return [p1.X(), p1.Y() + 1];}, function() { return c1.Radius(); }]);
```

* Attributes
  - center
  中心点
  - hasInnerPoints
  如果为true 鼠标移动到点内会触发hasPoint
  - label
  圆心的标签
  - point
  中心点 与center 有什么不同？
  - 其他
  借用其他元素的属性：JXG.GeometryElement
* Fields
借用其他元素的字段：JXG.Circle
* Methods
借用其他元素的方法：JXG.Circle、JXG.GeometryElement
* Events
借用其他元素的事件：JXG.GeometryElement

Circumcenter 外心（数学三角形中垂线交点） JXG.GeometryElement,JXG.CoordsElement -> JXG.Point -> Circumcenter

Defined in composition.js Extends JXG.point JXG.Board#create type:‘circumcenter’

param p1----JXG.Point p2----JXG.Point
p3----JXG.Point
example

var p1 = board.create('point', [0.0, 2.0]);
var p2 = board.create('point', [2.0, 1.0]);
var p3 = board.create('point', [3.0, 3.0]);

var cc1 = board.create('circumcenter', [p1, p2, p3]);

Attributes 借用其他元素的属性：JXG.GeometryElement
Fields 借用其他元素的字段：JXG.GeometryElement
Methods 借用其他元素的方法：JXG.point、JXG.GeometryElement、JXG.CoordsElement
Events 借用其他元素的事件：JXG.GeometryElement

Circumcircle 外接圆 JXG.GeometryElement -> JXG.Circle -> circumcircle

Defined in composition.js Extends JXG.Circle

param p1----JXG.Point 圆上的三点 p2----JXG.Point
p3----JXG.Point
example

var p1 = board.create('point', [0.0, 2.0]);
var p2 = board.create('point', [2.0, 1.0]);
var p3 = board.create('point', [3.0, 3.0]);

var cc1 = board.create('circumcircle', [p1, p2, p3]);

Attributes
- center 圆心 -其他借用其他元素的属性：JXG.GeometryElement
Fields 借用其他元素的字段：JXG.Circle、JXG.GeometryElement
Methods 借用其他元素的方法：JXG.Circle、JXG.GeometryElement
Events 借用其他元素的事件：JXG.GeometryElement

CircumcircleArc 外接圆弧 JXG.GeometryElement -> JXG.Curve -> Curve -> Arc -> circumcircleArc

Defined in arc.js Extends Arc JXG.Board#create type:‘circumcirclearc’

param p1----JXG.Point 圆上的三点 p2----JXG.Point
p3----JXG.Point
example

var p1 = board.create('point', [0.0, 2.0]);
var p2 = board.create('point', [2.0, 1.0]);
var p3 = board.create('point', [3.0, 3.0]);

var cc1 = board.create('circumcircle', [p1, p2, p3]);

弧从p1->p2->p3

Attributes
- center 圆心
- 其他借用其他元素的属性：JXG.GeometryElement
Fields 借用其他元素的字段：JXG.Circle、JXG.GeometryElement
Methods 借用其他元素的方法：JXG.Arc、JXG.Curve、JXG.GeometryElement
Events 借用其他元素的事件：JXG.GeometryElement

Conic 圆锥曲线 JXG.GeometryElement -> JXG.Curve -> Conic

Defined in conic.js Extends JXG.Curve JXG.Borad#create type:‘conic’

param a----JXG.Point|array b----JXG.Point|array c----JXG.Point|array d----JXG.Point|array e----JXG.Point|array 或者 a00----number a11----number a22----number a01----number a12----number a22----number
example

// Create a conic section through the points A, B, C, D, and E.
var A = board.create('point', [1,5]);
var B = board.create('point', [1,2]);
var C = board.create('point', [2,0]);
var D = board.create('point', [0,0]);
var E = board.create('point', [-1,5]);
var conic = board.create('conic',[A,B,C,D,E]);

Attributes
- foci ??? 焦点
- 其他借用其他元素的属性：JXG.GeometryElement
Fields 借用其他元素的字段：JXG.Curve、JXG.GeometryElement
Methods 借用其他元素的方法：JXG.Curve、JXG.GeometryElement
Events 借用其他元素的事件：JXG.GeometryElement

Curve 曲线 JXG.GeometryElement -> JXG.Curve -> Curve

Defined in Curve.js Extends JXG.Curve JXG.Board#create type:‘curve’

param Parametric Curve 参数曲线 x----function|number y----function|number a----function|number optional b----function|number optional 或 Data plots 数据图 x----array y----array|function|number 或 Polar Curve 极坐标曲线 r--------function offset---function|array|number a--------function|number default:-10 b--------function|number default:10
example

// Parametric curve
// Create a curve of the form (t-sin(t), 1-cos(t), i.e.
// the cycloid curve.
var graph = board.create('curve',
                     [function(t){ return t-Math.sin(t);},
                      function(t){ return 1-Math.cos(t);},
                      0, 2*Math.PI]
                  );

// Data plots
// Connect a set of points given by coordinates with dashed line segments.
// The x- and y-coordinates of the points are given in two separate
// arrays.
var x = [0,1,2,3,4,5,6,7,8,9];
var y = [9.2,1.3,7.2,-1.2,4.0,5.3,0.2,6.5,1.1,0.0];
var graph = board.create('curve', [x,y], {dash:2});

// Polar plot
// Create a curve with the equation r(phi)= a*(1+phi), i.e.
// a cardioid.
var a = board.create('slider',[[0,2],[2,2],[0,1,2]]);
var graph = board.create('curve',
                     [function(phi){ return a.Value()*(1-Math.cos(phi));},
                      [1,0],
                      0, 2*Math.PI]
                  );

// Draggable Bezier curve
var col, p, c;
col = 'blue';
p = [];
p.push(board.create('point',[-2, -1 ], {size: 5, strokeColor:col, fillColor:col}));
p.push(board.create('point',[1, 2.5 ], {size: 5, strokeColor:col, fillColor:col}));
p.push(board.create('point',[-1, -2.5 ], {size: 5, strokeColor:col, fillColor:col}));
p.push(board.create('point',[2, -2], {size: 5, strokeColor:col, fillColor:col}));

c = board.create('curve', JXG.Math.Numerics.bezier(p),
            {strokeColor:'red', name:"curve", strokeWidth:5, fixed: false}); // Draggable curve
c.addParents(p);

Attributes
- curveType 在JXG.Curve#generateTerm中设置，在JXG.Curve#updateCurve中使用值：string
  - none
  - plot:Data plot
  - parameter:无法区分是功能函数还是参数曲线
  - functiongraph：图形函数
  - polar：极线
  - implicit：(not yet) 只有parameter和plot 可以直接设置，Polar只能通过JXG.GeometryElement#setAttribute
- doAdvancedPlot 如果为true，使用二分递归法 default:true
- doAdvancedPlotOld 如果为true，使用Gillam and Hohenwarter算法 default：false
- handDrawing 曲线的数据点相连不是用直线而是Bezier曲线 default:false
- numberPointsHigh 用于通过up events绘制曲线触发以防Curve#doAdvancedPlot为false default：1600
- numberPointsLow 用于通过move events绘制曲线触发以防Curve#doAdvancedPlot为false default：400
- RDPsmoothing 采用Ramer Douglas Peuker平滑 default:false
- 其他借用其他元素的属性：JXG.GeometryElement
Fields 借用其他元素的字段：JXG.Curve、JXG.GeometryElement
Methods JXG.Curve、JXG.GeometryElement
Events 借用其他元素的事件：JXG.GeometryElement

Ellipse 椭圆 JXG.GeometryElement -> JXG.Curve -> Conic -> Ellipse

Defined in conic.js Extends Conic JXG.Board#create type:‘ellipse’

param point1----JXG.Point|array point2----JXG.Point|array point3----JXG.Point|array 或者 point1----JXG.Point|array point2----JXG.Point|array number----function |number 主轴的长度可以参数第四和第五定义曲线长度默认值是-PI到PI
example

  // Create an Ellipse by three points
  var A = board.create('point', [-1,4]);
  var B = board.create('point', [-1,-4]);
  var C = board.create('point', [1,1]);
  var el = board.create('ellipse',[A,B,C]);

A B为椭圆焦点 C为椭圆上一点

Attributes 借用其他元素的属性：JXG.GeometryElement
Fields 借用其他元素的字段：JXG.Curve
Methods 借用其他元素的方法：JXG.Curve、JXG.GeometryElement
Events 借用其他元素的事件：JXG.GeometryElement

Functiongraph 图形函数

Glider （滑翔机）点 JXG.GeometryElement,JXG.CoordsElement -> JXG.Point -> Glider

Defined in point.js Extends JXG.Point JXG.Board#Create type:‘glider’

param z--------------number optional x--------------number optional y--------------number optional GliderObject---JXG.GeometryElement
example

// Create a glider with user defined coordinates. If the coordinates are not on
// the circle (like in this case) the point will be projected onto the circle.
var p1 = board.create('point', [2.0, 2.0]);
var c1 = board.create('circle', [p1, 2.0]);
var p2 = board.create('glider', [2.0, 1.5, c1]);

// Create a glider with default coordinates (1,0,0). Same premises as above.
var p1 = board.create('point', [2.0, 2.0]);
var c1 = board.create('circle', [p1, 2.0]);
var p2 = board.create('glider', [c1]);

Attributes 借用其他元素的属性：JXG.GeometryElement
Fields
- sliderObject 通过 JXG.Point#makeGlider 设置
- 其他借用其他元素的字段：JXG.GeometryElement、JXG.CoordsElement
Methods
- startAnimation(direction,stepCount) animate the point direction is animated +1 or -1----number stepCount steps ----number
- stopAnimation() Stop animation
- 其他借用其他元素的方法：JXG.Point、JXG.GeometryElement、JXG.CoordsElement
Events 借用其他元素的方法：JXG.GeometryElement

Grid 网格 JXG.GeometryElement -> JXG.Curve -> Grid

Defined in composition.js Extends JXG.Curve JXG.Board#Create type:‘grid’

grid = board.create('gird',[])

Group svg g元素 JXG.Group -> Group

Defined in composition.js Extends JXG.Curve JXG.Board#create type:‘group’

param board--------JXG.Board 在board上的点 parents------array 点的组合 Attributes---object 视觉特性（未使用的）
example

// Create some free points. e.g. A, B, C, D
// Create a group

var p, col, g;
col = 'blue';
p = [];
p.push(board.create('point',[-2, -1 ], {size: 5, strokeColor:col, fillColor:col}));
p.push(board.create('point',[2, -1 ], {size: 5, strokeColor:col, fillColor:col}));
p.push(board.create('point',[2, 1 ], {size: 5, strokeColor:col, fillColor:col}));
p.push(board.create('point',[-2, 1], {size: 5, strokeColor:col, fillColor:col}));
g = board.create('group', p);

// Create some free points. e.g. A, B, C, D
// Create a group
// If the points define a polygon and the polygon has the attribute hasInnerPoints:true,
// the polygon can be dragged around.
// hasInnerPoints 鼠标移上去 haspoint==true 表示可以拖动这个元素
var p, col, pol, g;
col = 'blue';
p = [];
p.push(board.create('point',[-2, -1 ], {size: 5, strokeColor:col, fillColor:col}));
p.push(board.create('point',[2, -1 ], {size: 5, strokeColor:col, fillColor:col}));
p.push(board.create('point',[2, 1 ], {size: 5, strokeColor:col, fillColor:col}));
p.push(board.create('point',[-2, 1], {size: 5, strokeColor:col, fillColor:col}));

pol = board.create('polygon', p, {hasInnerPoints: true});
g = board.create('group', p);

// Allow rotations:
// Define a center of rotation and declare points of the group as "rotation points".

var p, col, pol, g;
col = 'blue';
p = [];
p.push(board.create('point',[-2, -1 ], {size: 5, strokeColor:col, fillColor:col}));
p.push(board.create('point',[2, -1 ], {size: 5, strokeColor:'red', fillColor:'red'}));
p.push(board.create('point',[2, 1 ], {size: 5, strokeColor:'red', fillColor:'red'}));
p.push(board.create('point',[-2, 1], {size: 5, strokeColor:col, fillColor:col}));

pol = board.create('polygon', p, {hasInnerPoints: true});
g = board.create('group', p);
g.setRotationCenter(p[0]);
g.setRotationPoints([p[1], p[2]]);

// Allow rotations:
// As rotation center, arbitrary points, coordinate arrays,
// or functions returning coordinate arrays can be given.
// Another possibility is to use the predefined string 'centroid'.

// The methods to define the rotation points can be chained.

var p, col, pol, g;
col = 'blue';
p = [];
p.push(board.create('point',[-2, -1 ], {size: 5, strokeColor:col, fillColor:col}));
p.push(board.create('point',[2, -1 ], {size: 5, strokeColor:'red', fillColor:'red'}));
p.push(board.create('point',[2, 1 ], {size: 5, strokeColor:'red', fillColor:'red'}));
p.push(board.create('point',[-2, 1], {size: 5, strokeColor:col, fillColor:col}));

pol = board.create('polygon', p, {hasInnerPoints: true});
g = board.create('group', p).setRotationCenter('centroid').setRotationPoints([p[1], p[2]]);

// Allow scaling:
// As for rotation one can declare points of the group to trigger a scaling operation.
// For this, one has to define a scaleCenter, in analogy to rotations.

// Here, the yellow  point enables scaling, the red point a rotation.

var p, col, pol, g;
col = 'blue';
p = [];
p.push(board.create('point',[-2, -1 ], {size: 5, strokeColor:col, fillColor:col}));
p.push(board.create('point',[2, -1 ], {size: 5, strokeColor:'yellow', fillColor:'yellow'}));
p.push(board.create('point',[2, 1 ], {size: 5, strokeColor:'red', fillColor:'red'}));
p.push(board.create('point',[-2, 1], {size: 5, strokeColor:col, fillColor:col}));

pol = board.create('polygon', p, {hasInnerPoints: true});
g = board.create('group', p).setRotationCenter('centroid').setRotationPoints([p[2]]);
g.setScaleCenter(p[0]).setScalePoints(p[1]);

// Allow Translations:
// By default, every point of a group triggers a translation.
// There may be situations, when this is not wanted.

// In this example, E triggers nothing, but itself is rotation center
// and is translated, if other points are moved around.

var p, q, col, pol, g;
col = 'blue';
p = [];
p.push(board.create('point',[-2, -1 ], {size: 5, strokeColor:col, fillColor:col}));
p.push(board.create('point',[2, -1 ], {size: 5, strokeColor:'yellow', fillColor:'yellow'}));
p.push(board.create('point',[2, 1 ], {size: 5, strokeColor:'red', fillColor:'red'}));
p.push(board.create('point',[-2, 1], {size: 5, strokeColor:col, fillColor:col}));
q = board.create('point',[0, 0], {size: 5, strokeColor:col, fillColor:col});

pol = board.create('polygon', p, {hasInnerPoints: true});
g = board.create('group', p.concat(q)).setRotationCenter('centroid').setRotationPoints([p[2]]);
g.setScaleCenter(p[0]).setScalePoints(p[1]);
g.removeTranslationPoint(q);

Attributes
Fields
Methods 借用其他元素：JXG.Group

Hatch

Hyperbola 双曲线 JXG.GeometryElement -> JXG.Curve -> Conic -> Hyperbola

Define in conic.js Extends Conic JXG.Board#create type:‘hypebola’

param point1----JXG.Point|array point2----JXG.Point|array point3----JXG.Point|array 或 point1----JXG.Point|array point1----JXG.Point|array number----function |number
example

// Create an Hyperbola by three points
var A = board.create('point', [-1,4]);
var B = board.create('point', [-1,-4]);
var C = board.create('point', [1,1]);
var el = board.create('hyperbola',[A,B,C]);

Image 图片 JXG.GeometryElement -> JXG.Image -> Image

Define in JXG.Image Extends JXG.Image JXG.Board#create type:‘image’

param url----string|function coords-array size---array
example

var im = board.create('image', ['http://jsxgraph.uni-bayreuth.de/jsxgraph/distrib/images/uccellino.jpg', [-3,-2], [3,3]]);

Attributes
- attractor List of attractor elements. If the distance of the image is less than attractorDistance the image is made to glider of this element. default:empty
- rotate 旋转角度 default:0
- snapSizeX Defines together with Image#snapSizeY the grid the image snaps on to. The image will only snap on integer multiples to snapSizeX in x and snapSizeY in y direction. If this value is equal to or less than 0, it will use the grid displayed by the major ticks of the default ticks of the default x axes of the board.
- snapSizeY
- 其他借用其他元素的属性：JXG.GeometryElement
Fields 借用其他元素的字段：JXG.GeometryElement
Methods 借用其他元素的方法：JXG.Image、JXG.GeometryElement、JXG.CoordsElement
Events 借用其他元素的事件：JXG.CoordsElement

Incenter 内心，内切圆心 JXG.GeometryElement,JXG.CoordsElement -> JXG.Point -> Incenter

Defined in composition.js Extends JXG.Point JXG.Board#create type:‘incenter’

param p1----JXG.Point p2----JXG.Point p3----JXG.Point
example

var p1 = board.create('point', [0.0, 2.0]);
var p2 = board.create('point', [2.0, 1.0]);
var p3 = board.create('point', [3.0, 3.0]);

var ic1 = board.create('incenter', [p1, p2, p3]);

Attributes 借用其他元素的属性：JXG.GeometryElement
Fields JXG.GeometryElement、JXG.CoordsElement
Methods JXG.Point、JXG.GeometryElement
Events JXG.GeometryElement

Incircle 内切圆 JXG.GeometryElement -> JXG.Circle -> Incircle

Defined in composition.js Extends JXG.Circle JXG.Board#create type:‘Incircle’

param p1----JXG.Point p2----JXG.Point p3----JXG.Point
example

var p1 = board.create('point', [0.0, 2.0]);
var p2 = board.create('point', [2.0, 1.0]);
var p3 = board.create('point', [3.0, 3.0]);

var ic1 = board.create('incircle', [p1, p2, p3]);

Attributes 借用其他元素的属性：JXG.GeometryElement
Fields JXG.GeometryElement、JXG.Circle
Methods JXG.Circle、JXG.GeometryElement
Events JXG.GeometryElement

Inqueually 线性不等式表示区域 JXG.GeometryElement -> JXG.Curve -> Inequality

Defined in composition.js Extends JXG.Curve JXG.Board#create type:‘inequality’

param l----JXG.Line
example

var p = board.create('point', [1, 3]),
    q = board.create('point', [-2, -4]),
    l = board.create('line', [p, q]),
    ineq = board.create('inequality', [l]);
    ineq = board.create('inequality', [l]);

  // Plot the inequality 
  //     y >= 2/3 x + 1 
  // or 
  //     0 >= -3y + 2x +1
  var l = board.create('line', [1, 2, -3]),
  ineq = board.create('inequality', [l], {inverse:true});

Attributes
- inverse 显示区域默认为false 显示线的下方区

Input input标签(提供输入) JXG.GeometryElement,JXG.CoordsElement -> JXG.Text ->Text ->Input

Defined in input.js Extends Text JXG.Board#create type:‘input’

param x----number|function y----number|function value----string label----string
example

  // Create an input element at position [1,4].
  var input = board.create('input', [0, 1, 'sin(x)*x', 'f(x)='], {});
  var f = board.jc.snippet(input.Value(), true, 'x', false);
  var graph = board.create('functiongraph',[f,
       function() {
         var c = new JXG.Coords(JXG.COORDS_BY_SCREEN,[0,0],board);
         return c.usrCoords[1];
       },
       function() {
         var c = new JXG.Coords(JXG.COORDS_BY_SCREEN,[board.canvasWidth,0],board);
         return c.usrCoords[1];
       }
     ]);

  board.create('text', [1, 3, updateGraph()]);

  var updateGraph = function() {
    graph.Y = board.jc.snippet(input.Value(), true, 'x', false);
    graph.updateCurve();
    board.update();
  }

Integral 给定时间间隔的曲线积分 JXG.GeometryElement -> JXG.Curve -> Integral

Intersection 交叉 JXG.GeometryElement,JXG.CoordsElement -> JXG.Point -> Intersection

Defined in point.js Extends JXG.Point JXG.Board#create type:‘Intersection’

param el1----JXG.Line el2----JXG.Line i------number i==0 用正的平方根 i==1 用负的平方根
example

// Create an intersection point of circle and line
var p1 = board.create('point', [2.0, 2.0]);
var c1 = board.create('circle', [p1, 2.0]);

var p2 = board.create('point', [2.0, 2.0]);
var p3 = board.create('point', [3.0, 2.0]);
var l1 = board.create('line', [p2, p3]);

var i = board.create('intersection', [c1, l1, 0]);

Line 线 JXG.GeometryElement -> JXG.Line -> Line

Defined in line.js Extends JXG.Line JXG.Borad#create type:‘line’

param point1-----JXG.Point|array|function point2-----JXG.Point|array|function or c----number|function a----number|function b----number|function ax+by+c=0 or f----function
example

  // Create a line using point and coordinates/
  // The second point will be fixed and invisible.
  var p1 = board.create('point', [4.5, 2.0]);
  var l1 = board.create('line', [p1, [1.0, 1.0]]);

  // Create a line using three coordinates
  var l1 = board.create('line', [1.0, -2.0, 3.0]);

Attributes
- firstArrow 起点箭头
- label 线的标签
- lastArrow 结束点箭头
- point1 线的第一个点
- point2 线的第二个点
- snapSizeX Defines together with JXG.Point#snapSizeY the grid the point snaps on to 线段的x JXG.Point#snapSizeX
- snapSizeY Defines together with JXG.Point#snapSizeY the grid the point snaps on to 线段的y JXG.Point#snapSizeY
- snapToGrid If set to true, the point will snap to a grid defined by JXG.Point#snapSizeX and JXG.Point#snapSizeY. 如果设置为true,通过1和2 点将捕获一个网格
- straightFirst If true, line stretches infinitely in direction of its first point. 如果设置为true 通过第一个点无限延长射线
- straightLast 与第一个点相反
- ticks 线的记号
- touchFirstPoint If set to true and Line#firstArrow is set to true, the arrow head will just touch the circle line of the start point of the line.
- touchLastPoint If set to true and Line#lastArrow is set to true, the arrow head will just touch the circle line of the start point of the line.
- 其他 JXG.Line
Fields JXG.Line JXG.GeometryElement
Methods JXG.Line、JXG.GeometryElement
Events JXG.GeometryElement

Locus 轨迹 JXG.GeometryElement -> JXG.Curve -> Locus

MajorArc 大弧 JXG.GeometryElement -> JXG.Curve -> Curve-> MajorArc

Defined in arc.js Extends Curve JXG.Borad#create type:‘majorarc’

param p1----JXG.Point p2----JXG.Point p3----JXG.Point
example

  // Create an arc out of three free points
  var p1 = board.create('point', [2.0, 2.0]);
  var p2 = board.create('point', [1.0, 0.5]);
  var p3 = board.create('point', [3.5, 1.0]);

  var a = board.create('majorarc', [p1, p2, p3]);

MajorSector 大扇区 JXG.GeometryElement -> JXG.Curve -> Curve -> MajorSector

Defined in sector.js Extends Curve JXG.Borad#create type:‘majorsector’

param p1----JXG.Point p2----JXG.Point p3----JXG.Point
example

// Create an arc out of three free points
var p1 = board.create('point', [2.0, 2.0]);
var p2 = board.create('point', [1.0, 0.5]);
var p3 = board.create('point', [3.5, 1.0]);

var a = board.create('majorsector', [p1, p2, p3]);

Midpoint 中点 JXG.GeometryElement -> JXG.Point -> Midpoint

Defined in composition.js Extends JXG.Point JXG.Board#create type:‘midpoint’

param p1----JXG.Point p2----JXG.Point or l-----JXG.Line
example

// Create base elements: 2 points and 1 line
var p1 = board.create('point', [0.0, 2.0]);
var p2 = board.create('point', [2.0, 1.0]);
var l1 = board.create('segment', [[0.0, 3.0], [3.0, 3.0]]);

var mp1 = board.create('midpoint', [p1, p2]);
var mp2 = board.create('midpoint', [l1]);

MinorArc 小狐 JXG.GeometryElement -> JXG.Curve -> Curve-> MinorArc

MinorSector 小扇区 JXG.GeometryElement -> JXG.Curve -> Curve -> MinorSector

Mirrorpoint 镜像点 JXG.GeometryElement,JXG.CoordsElement -> JXG.Point -> Mirrorpoint

example

var p1 = board.create('point', [3.0, 3.0]);
var p2 = board.create('point', [6.0, 1.0]);
var mp1 = board.create('mirrorpoint', [p1, p2]);

NonReflexAngle 无反射性角 JXG.GeometryElement -> JXG.Curve -> Sector -> Angle -> NonReflexAngle

example

// Create a non-reflex angle out of three free points
var p1 = board.create('point', [5.0, 3.0]),
    p2 = board.create('point', [1.0, 0.5]),
    p3 = board.create('point', [1.5, 5.0]),

    a = board.create('nonreflexangle', [p1, p2, p3], {radius: 2});

Normal (数)法线 JXG.GeometryElement -> JXG.Line -> Normal

param o----JXG.Line|JXG.Circle|JXG.Curve|JXG.Turtle p----JXG.Point
example

// Create a normal to a circle.
var p1 = board.create('point', [2.0, 2.0]);
var p2 = board.create('point', [3.0, 2.0]);
var c1 = board.create('circle', [p1, p2]);

var norm1 = board.create('normal', [c1, p2]);

Orthogonalprojection 正交投影 JXG.CoordsElement,JXG.GeometryElement -> JXG.Point -> Orthogonalprojection

Defined in composition.js Extends JXG.Point JXG.Board#create type:‘orthogonalprojection’ 点到线的垂点

param p----JXG.Point l----JXG.line
example

var p1 = board.create('point', [0.0, 4.0]);
var p2 = board.create('point', [6.0, 1.0]);
var l1 = board.create('line', [p1, p2]);
var p3 = board.create('point', [3.0, 3.0]);

var pp1 = board.create('orthogonalprojection', [p3, l1]);

OtherIntersection 其他的交叉 JXG.CoordsElement,JXG.CoordsElement -> JXG.Point -> OtherIntersection

example

// Create an intersection point of circle and line 
// 和原图有区别？？？？
var p1 = board.create('point', [2.0, 2.0]);
var c1 = board.create('circle', [p1, 2.0]);

var p2 = board.create('point', [2.0, 2.0]);
var p3 = board.create('point', [2.0, 2.0]);
var l1 = board.create('line', [p2, p3]);

var i = board.create('intersection', [c1, l1, 0]);
var j = board.create('otherintersection', [c1, l1, i]);

Parabola 抛物线 JXG.GeometryElement -> JXG.Curve -> Conic -> Parabola

param point----JXG.Point|array Line-----JXG.line
example

// Create a parabola by a point C and a line l.
var A = board.create('point', [-1,4]);
var B = board.create('point', [-1,-4]);
var l = board.create('line', [A,B]);
var C = board.create('point', [1,1]);
var el = board.create('parabola',[C,l]);

Parallel 平行线 JXG.GeometryElement -> JXG.Line -> Line -> Parallel

param l----JXG.Line p----JXG.Point
example

// Create a parallel
var p1 = board.create('point', [0.0, 2.0]);
var p2 = board.create('point', [2.0, 1.0]);
var l1 = board.create('line', [p1, p2]);

var p3 = board.create('point', [3.0, 3.0]);
var pl1 = board.create('parallel', [l1, p3]);

Parallelpoint 平行点 JXG.GeometryElement,JXG.CoordsElement -> JXG.Point -> Parallelpoint

param p1----JXG.Point p2----JXG.Point p3----JXG.Point
example l----JXG.Line p----JXG.Point
example

var p1 = board.create('point', [0.0, 2.0]);
var p2 = board.create('point', [2.0, 1.0]);
var p3 = board.create('point', [3.0, 3.0]);

var pp1 = board.create('parallelpoint', [p1, p2, p3]);

Perpendicular 垂直线 JXG.GeometryElement -> JXG.Line -> Segment -> Perpendicular

Defined in composition.js Extends Segment JXG.Borad#create type:‘perpendicular’

param l----JXG.Line p----JXG.Point
example

// Create a perpendicular
var p1 = board.create('point', [0.0, 2.0]);
var p2 = board.create('point', [2.0, 1.0]);
var l1 = board.create('line', [p1, p2]);

var p3 = board.create('point', [3.0, 3.0]);
var perp1 = board.create('perpendicular', [l1, p3]);

PerpendicularPoint 垂直点 JXG.CoordsElement,JXG.GeometryElement -> JXG.Point -> PerpendicularPoint

param p----JXG.Line l----JXG.Point
example

  var p1 = board.create('point', [0.0, 4.0]);
  var p2 = board.create('point', [6.0, 1.0]);
  var l1 = board.create('line', [p1, p2]);
  var p3 = board.create('point', [3.0, 3.0]);

  var pp1 = board.create('perpendicularpoint', [p3, l1]);

PerpendicularSegment 垂线段 JXG.GeometryElement -> JXG.Line -> Segment -> PerpendicularSegment

param l----JXG.Line p----JXG.Point
example

// Create a perpendicular
var p1 = board.create('point', [0.0, 2.0]);
var p2 = board.create('point', [2.0, 1.0]);
var l1 = board.create('line', [p1, p2]);

var p3 = board.create('point', [3.0, 3.0]);
var perp1 = board.create('perpendicularsegment', [l1, p3]);

Point 点 JXG.CoordsElement,JXG.GeometryElement -> JXG.Point -> Point

Defined in point.js Extends JXG.Point JXG.Board#create type:‘point’

param z----number|string|function optional x----number|string|function y----number|string|function
example

// Create a free point using affine euclidean coordinates
var p1 = board.create('point', [3.5, 2.0]);

// Create a constrained point using anonymous function
var p2 = board.create('point', [3.5, function () { return p1.X(); }]);

// Create a point using transformations
var trans = board.create('transform', [2, 0.5], {type:'scale'});
var p3 = board.create('point', [p2, trans]);

Attributes
- attractorDistance If the distance of the point to one of its attractors is less than this number the point will be a glider on this attracting element. If set to zero nothing happens default:0
- attractors List of attractor elements. If the distance of the point is less than attractorDistance the point is made to glider of this element default:empty
- attractorUnit Unit for attractorDistance and snatchDistance, used for magnetized points and for snapToPoints Value ‘screen’ and ‘user’ default:‘user’
- face 点的样式 There are different point styles which differ in appearance Value：cross、circle、square、plus、diamond、triangleUp、triangleDown、triangleLeft、triangleRight
- ignoreSnapToPoints List of elements which are ignored by snapToPoints default:empty array
- infoboxDigits
  - ‘auto’ done automatically by JXG#autoDigits
  - ‘none’ no truncation
  - ‘number’ user String.toFixed(); default:auto
- showInfobox infobox在鼠标移上去的时候会显示 default:true
- size 点的大小 default:3
- snapSizeX Defines together with Point#snapSizeY the grid the point snaps on to. The point will only snap on integer multiples to snapSizeX in x and snapSizeY in y direction. If this value is equal to or less than 0, it will use the grid displayed by the major ticks of the default ticks of the default x axes of the board default:1
- snapSizeY default:1
- snapToGrid If set to true, the point will snap to a grid defined by Point#snapSizeX and Point#snapSizeY. default:false
- snapToPoints If set to true, the point will snap to the nearest point in distance of Point#attractorDistance. default:false
- snatchDistance If the distance of the point to one of its attractors is at least this number the point will be released from being a glider on the attracting element. If set to zero nothing happens. default:0.0
- style 确定点布局，defaul:5
- zoom 如果为true，点得大小可以通过zoom events改变 default:false

PolarLine 极线 JXG.GeometryElement -> JXG.Line -> PolarLine

PolePoint 极点 JXG.GeometryElement,JXG.CoordsElement -> JXG.Point -> PolePoint

Polygon 多边形 JXG.GeometryElement -> JXG.Polygon -> Polygon

Defined in polygon.js Extends JXG.Polygon JXG.Board#create type:‘polygon’

param list points a list of points or a list of coordinate arrays or a function returning a list of coordinate arrays.
example

var p1 = board.create('point', [0.0, 2.0]);
var p2 = board.create('point', [2.0, 1.0]);
var p3 = board.create('point', [4.0, 6.0]);
var p4 = board.create('point', [1.0, 4.0]);
var pol = board.create('polygon', [p1, p2, p3, p4]);

var p = [[0.0, 2.0], [2.0, 1.0], [4.0, 6.0], [4.0, 6.0], [4.0, 6.0], [1.0, 3.0]];
var pol = board.create('polygon', p, {hasInnerPoints: true});

var f1 = function() { return [0.0, 2.0]; }, 
    f2 = function() { return [2.0, 1.0]; }, 
    f3 = function() { return [4.0, 6.0]; }, 
    f4 = function() { return [1.0, 4.0]; }, 
    cc1 = board.create('polygon', [f1, f2, f3, f4]);

RadicalAxis 根轴 JXG.GeometryElement -> JXG.Line -> RadicalAxis

defined in line.js Extends JXG.Line JXG.Board#create type:‘line’

example

// Create the radical axis line with respect to two circles
var board = JXG.JSXGraph.initBoard('7b7233a0-f363-47dd-9df5-5018d0d17a98', {boundingbox: [-1, 9, 9, -1], axis: true, showcopyright: false, shownavigation: false});
var p1 = board.create('point', [2, 3]);
var p2 = board.create('point', [1, 4]);
var c1 = board.create('circle', [p1, p2]);
var p3 = board.create('point', [6, 5]);
var p4 = board.create('point', [8, 6]);
var c2 = board.create('circle', [p3, p4]);
var r1 = board.create('radicalaxis', [c1, c2]);

Reflection 反射 JXG.GeometryElement -> JXG.Point -> Reflection

ReflexAngle 反射角 JXG.GeometryElement -> JXG.Curve -> Sector -> ReflexAngle

RegularPolygon 正多边形 JXG.GeometryElement -> JXG.polygon -> Polygon -> RegularPolygon

Defined In Polygon.js Extends Polygon JXG.Board#create type:‘regularpolygon’

param p1----JXG.Point p2----JXG.Point n-----number
example

  var p1 = board.create('point', [0.0, 2.0]);
  var p2 = board.create('point', [2.0, 1.0]);
  var pol = board.create('regularpolygon', [p1, p2, 5]);

  var p1 = board.create('point', [0.0, 2.0]);
  var p2 = board.create('point', [4.0,4.0]);
  var p3 = board.create('point', [2.0,0.0]);
  var pol = board.create('regularpolygon', [p1, p2, p3]);

Attributes
- borders 多边形的边
- hasInnerPoints 鼠标经过点内时触发hasPoint事件 default:false
- vertices 多边形的顶点
- withLines 多边形的边由通过线连接？？？
- 其他借用其他元素的属性：Polygon
Fields JXG.GeometryElement
Methods JXG.Polygon、JXG.GeometryElement
Events JXG.GeometryElement

Riemannsum 黎曼和(高等数学积分) JXG.GeometryElement -> JXG.curve -> Riemannsum

Sector 扇形 JXG.GeometryElement -> JXG.Curve -> Sector

Defined in sector.js Extends JXG.Curve JXG.Borad#create type:‘sector’

param p1----JXG.Point 弧心 p2----JXG.Point 弧的起点（p1到p2的距离—半径） p3----JXG.Point 弧的终点
example

  // Create a sector out of three free points
  var p1 = board.create('point', [1.5, 5.0]),
      p2 = board.create('point', [1.0, 0.5]),
      p3 = board.create('point', [5.0, 3.0]),
      a = board.create('sector', [p1, p2, p3]);

// Create a sector out of two lines, two directions and a radius
  var p1 = board.create('point', [-1, 4]),
  p2 = board.create('point', [4, 1]),
  q1 = board.create('point', [-2, -3]),
  q2 = board.create('point', [4,3]),

  li1 = board.create('line', [p1,p2], {strokeColor:'black', lastArrow:true}),
  li2 = board.create('line', [q1,q2], {lastArrow:true}),

  sec1 = board.create('sector', [li1, li2, [5.5, 0], [4, 3], 3]),
  sec2 = board.create('sector', [li1, li2, 1, -1, 4]);

Attributes
- anglepoint helper point anglepoint 辅助点anglepoint
- arc sub-element arc
- center helper point center
- label the sector label
- radiuspoint helper point radiuspoint
Fields
- point1 Midpoint of the sector
- point2 This point together with Sector#point1 defines the radius
- point3 Defines the sector’s angle
- point4 Defines the sectors orientation in case of circumCircleSectors
Methods
- hasPointSector(x,y) Checks whether (x,y) is within the area defined by the sector.
  - x Coordinate in x direction, screen coordinates.
  - y Coordinate in y direction, screen coordinates.
- Radius() the distance between Sector#point1 and Sector#point2 p1到p2的距离

Segment 段 JXG.GeometryElement -> JXG.Line -> Segment

Defined in line.js Extends JXG.Line JXG.Board#create type:‘segment’

param point1----JXG.Point|array point2
example

// Create a segment providing two points.
var p1 = board.create('point', [4.5, 2.0]);
var p2 = board.create('point', [1.0, 1.0]);
var l1 = board.create('segment', [p1, p2]);

// Create a segment providing two points.
var p1 = board.create('point', [4.0, 1.0]);
var p2 = board.create('point', [1.0, 1.0]);
var l1 = board.create('segment', [p1, p2]);
var p3 = board.create('point', [4.0, 2.0]);
var p4 = board.create('point', [1.0, 2.0]);
var l2 = board.create('segment', [p3, p4, 3]);
var p5 = board.create('point', [4.0, 3.0]);
var p6 = board.create('point', [1.0, 4.0]);
var l3 = board.create('segment', [p5, p6, function(){ return l1.L();} ]);

Semicircle 半圆形 JXG.GeometryElement -> JXG.Curve -> Curve -> Arc -> Semicircle

example

  // Create an arc out of three free points
  var p1 = board.create('point', [4.5, 2.0]);
  var p2 = board.create('point', [1.0, 0.5]);
  var a = board.create('semicircle', [p1, p2]);

Attributes
- midpoint center point of the semicircle
- 其他借用其他元素的属性：JXG.Curve
Fields 借用其他元素的属性：JXG.Curve、Arc

Slider 滑动块 JXG.CoordsElement,JXG.GeometryElement -> JXG.Point -> Glider -> Slider

Defined in slider.js Extends Glider JXG.Board#create type:‘slider’

param
- start----array
- end------array
- data-----array The first two arrays give the start and the end where the slider is drawn on the board. The third array gives the start and the end of the range the slider operates as the first resp. the third component of the array. The second component of the third array gives its start value
example

  // Create a slider with values between 1 and 10, initial position is 5.
  var s = board.create('slider', [[1, 2], [3, 2], [1, 5, 10]]);

  // Create a slider taking integer values between 1 and 50. Initial value is 50.
  var s = board.create('slider', [[1, 3], [3, 1], [1, 10, 50]], {snapWidth: 1});

Attributes
- baseline Attributes for the base line of the slider
- highline Attributes for the highlighting line of the slider
- label Attributes for the slider label.
- point1 Attributes for first (left) helper point defining the slider position.
- point2 Attributes for second (right) helper point defining the slider position.
- precision The precision of the slider value displayed in the optional text.
- size Size of slider point.
- snapWidth The slider only returns integer multiples of this value, e.g.
- ticks Attributes for the ticks of the base line of the slider.
- withLabel Show slider label.
- withTicks Show slider ticks.
Fields
- _smax End value of the slider range
- _smin Start value of the slider range.
- Value Returns the current slider value.
- 其他 Glider、JXG.GeometryElement、JXG.CoordsElement
Methods Glider JXG.Point JXG.GeometryElement JXG.CoordsElement
Events JXG.GeometryElement

Slopetriangle 斜三角形 JXG.GeometryElement -> JXG.Line -> Slopetriangle

Spline 样条 JXG.GeometryElement -> JXG.Curve -> Spline

Stepfunction 阶跃函数 JXG.GeometryElement -> JXG.Curve -> Stepfunction

example

  // Create step function.
  var curve = board.create('stepfunction', [[0,1,2,3,4,5], [1,3,0,2,2,1]]);

Tangent (数)正切 JXG.GeometryElement -> JXG.Line -> Tangent

example

// Create a tangent providing a glider on a function graph
var c1 = board.create('curve', [function(t){return t},function(t){return t*t*t;}]);
var g1 = board.create('glider', [0.6, 1.2, c1]);
var t1 = board.create('tangent', [g1]);

Tapemeasure 卷尺 JXG.GeometryElement -> JXG.Line -> Segment -> Tapemeasure

Text 文本 JXG.CoordsElement,JXG.GeometryElement -> JXG.Text -> Text

Defined in text.js Extends JXG.Text JXG.Board#create type:‘text’

param z------number|function optional x------number|function y------number|function str----string|function
example

  // Create a fixed text at position [0,1].
  var t1 = board.create('text',[0,1,"Hello World"]);

  // Create a variable text at a variable position.
  var s = board.create('slider',[[0,4],[3,4],[-2,0,2]]);
  var graph = board.create(
                    'text',
                    [
                      function(x){ return s.Value();},
                      1,
                      function(){return "The value of s is"+s.Value().toFixed(2);}
                    ]
                  );

Attributes
- anchor default:null Anchor element Point, Text or Image of the text. If it exists, the coordinates of the text are relative to this anchor elemen
- anchorX default:‘left’(left/middle/right) The horizontal alignment of the text
- anchorY default:‘middle’(top/middle/right) The vertical alignment of the text.
- attractors default:empty List of attractor elements. If the distance of the text is less than attractorDistance the text is made to glider of this element
- cssClass The precision of the slider value displayed in the optional text
- digits default:2 Used to round texts given by a number
- display default:‘html’ Determines the rendering method of the text. Possible values include ‘html’ and ‘internal’
- dragArea default:‘all’ Sensitive area for dragging the text. Possible values are ‘all’, or something else. This may be extended to left, right, … in the future
- fontSize default:12 字号
- highlightCssClass The precision of the slider value displayed in the optional text

Ticks 记号 JXG.GeometryElement -> JXG.Ticks -> Ticks

example

// Create an axis providing two coord pairs.
var p1 = board.create('point', [0, 3]);
var p2 = board.create('point', [1, 3]);
var l1 = board.create('line', [p1, p2]);
var t = board.create('ticks', [l1], {ticksDistance: 2});

  // Create an axis providing two coord pairs.
  var p1 = board.create('point', [0, 0]);
  var p2 = board.create('point', [50, 25]);
  var l1 = board.create('line', [p1, p2]);
  var t = board.create('ticks', [l1, 1], {
    insertTicks: true,
    majorHeight: -1,
    label: {
        offset: [4, -9]
    },
    drawLabels: true
  });

Attributes
- anchor default:‘left’
- drawLabels default:false
- drawZero default:false
- generateLabelText
- generateLabelValue
- includeBoundaries default:false
- insertTicks default:false
- labels default:[]
- majorHeight default:10
- maxLabelLenght default:5
- minorHeight default:4
- minorTicks default:4
- precision default:3
- scale default:1
- scaleSymbol default:”
- tickEndings default:[1,1]
- ticksDistance default:1

Jsxshapescreate