Usage (signatures)
board.create('reflection', [p, l]);
The resulting element is the reflection of an element p across the line l.
Parameters
| Name | Type | Description |
|---|---|---|
p |
Point | Line | Circle | Curve | Polygon | |
l |
Line |
Examples
Reflect point p3 on line l1
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 rp1 = board.create('reflection', [p3, l1]);
Reflection of various elements on line li
// reflection line
var li = board.create('line', [1,1,1], {strokeColor: '#aaaaaa'});
var p1 = board.create('point', [-3,-1], {name: "A"});
var q1 = board.create('reflection', [p1, li], {name: "A'"});
var l1 = board.create('line', [1,-5,1]);
var l2 = board.create('reflection', [l1, li]);
var cu1 = board.create('curve', [[-3, -3, -2.5, -3, -3, -2.5], [-3, -2, -2, -2, -2.5, -2.5]], {strokeWidth:3});
var cu2 = board.create('reflection', [cu1, li], {strokeColor: 'red', strokeWidth:3});
var pol1 = board.create('polygon', [[-6,-3], [-4,-5], [-5,-1.5]]);
var pol2 = board.create('reflection', [pol1, li]);
var c1 = board.create('circle', [[-2,-2], [-2, -1]]);
var c2 = board.create('reflection', [c1, li]);
var a1 = board.create('arc', [[1, 1], [0, 1], [1, 0]], {strokeColor: 'red'});
var a2 = board.create('reflection', [a1, li], {strokeColor: 'red'});
var s1 = board.create('sector', [[-3.5,-3], [-3.5, -2], [-3.5,-4]], {
anglePoint: {visible:true}, center: {visible: true}, radiusPoint: {visible: true},
fillColor: 'yellow', strokeColor: 'black'});
var s2 = board.create('reflection', [s1, li], {fillColor: 'yellow', strokeColor: 'black', fillOpacity: 0.5});
var an1 = board.create('angle', [[-4,3.9], [-3, 4], [-3, 3]]);
var an2 = board.create('reflection', [an1, li]);
Attributes
Own
center
- Description
Attributes of circle center, i.e. the center of the circle, if a circle is the mirror element and the transformation type is 'Euclidean'
- Type
- center
- Source
- options.js, line 8470
type
- Description
Type of transformation. Possible values are 'Euclidean', 'projective'.
If the value is 'Euclidean', the reflected element of a circle is again a circle, otherwise it is a conic section.
- Type
- String
- Overrides
- JXG.GeometryElement#type
- Default Value
- 'Euclidean'
- Source
- options.js, line 8480
Inherited
Members
Own
none
Inherited
Methods
Own
none
Inherited
Events
Own
none
Inherited
Throws
-
If the element cannot be constructed with the given parent objects an exception is thrown.
- Type
- Error
Details
- Type
- JXG.GeometryElement
- Source
- element/composition.js, line 1944