JSXGraph 1.9.2 Reference

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Element Angle

JXG.GeometryElement
   ↳ JXG.Curve
      ↳ Sector
            ↳ Angle

The angle element is used to denote an angle defined by three points. Visually it is just a Sector element with a radius not defined by the parent elements but by an attribute radius. As opposed to the sector, an angle has two angle points and no radius point. Sector is displayed if type=="sector". If type=="square", instead of a sector a parallelogram is displayed. In case of type=="auto", a square is displayed if the angle is near orthogonal. If no name is provided the angle label is automatically set to a lower greek letter.

Defined in: sector.js.
Extends Sector.

Methods borrowed from class Sector:

Area, autoRadius, hasPointSector, L, Perimeter, Radius, setPositionDirectly, setRadius

Methods borrowed from class JXG.Curve:

addTransform, allocatePoints, generateTerm, getTransformationSource, hasPoint, interpolationFunctionFromArray, maxX, minX, moveTo, notifyParents, update, updateCurve, updateDataArray, updateRenderer, updateTransform, X, Y, Z

Methods borrowed from class JXG.GeometryElement:

_set, addChild, addDescendants, addParents, addParentsFromJCFunctions, addRotation, addTicks, animate, bounds, clearTrace, cloneToBackground, countChildren, createGradient, createLabel, draggable, formatNumberLocale, fullUpdate, generatePolynomial, getAttribute, getAttributes, getLabelAnchor, getName, getParents, getProperty, getSnapSizes, getTextAnchor, getType, handleSnapToGrid, hide, hideElement, noHighlight, normalize, prepareUpdate, remove, removeAllTicks, removeChild, removeDescendants, removeTicks, resolveShortcuts, setArrow, setAttribute, setDash, setDisplayRendNode, setLabel, setLabelText, setName, setParents, setPosition, setProperty, show, showElement, snapToPoints, updateVisibility, useLocale

Events borrowed from class JXG.GeometryElement:

attribute, attribute:key, down, drag, keydrag, mousedown, mousedrag, mousemove, mouseout, mouseover, mouseup, move, out, over, pendown, pendrag, penup, touchdown, touchdrag, touchup, up

Default Value:

'{visible:false}'

Default Value:

{face: 'o', size: 2}

See:

Angle#orthoType

Default Value:

1.0

See:

Angle#orthoSensitivity

Default Value:

square

Default Value:

'auto'

Default Value:

'sector'

Returns:

{Object} Pointer to the angle element..

See:

Angle#setAngle

angle.setAngle(Math.PI / 6);
// ...
angle.free().setAngle(Math.PI / 4);

Parameters:

{Number|Function} val

Number or Function which returns the size of the angle in Radians

Returns:

{Object} Pointer to the angle element..

See:

Angle#free

Examples:

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();

Parameters:

{String} unit Optional, Default: 'length'

Unit of the returned values. Possible units are

• 'radians' (default): angle value in radians
• 'degrees': angle value in degrees
• 'semicircle': angle value in radians as a multiple of π, e.g. if the angle is 1.5π, 1.5 will be returned.
• 'circle': angle value in radians as a multiple of 2π
• 'length': length of the arc line of the angle

It is sufficient to supply the first three characters of the unit, e.g. 'len'.

Returns:

{Number} angle value in various units.

See:

Sector#L

Arc#Value

Examples:

var A, B, C, ang,
    r = 0.5;
A = board.create("point", [3, 0]);
B = board.create("point", [0, 0]);
C = board.create("point", [2, 2]);
ang = board.create("angle", [A, B, C], {radius: r});

console.log(ang.Value());
// Output Math.PI * 0.25

console.log(ang.Value('radian'));
// Output Math.PI * 0.25

console.log(ang.Value('degree');
// Output 45

console.log(ang.Value('semicircle'));
// Output 0.25

console.log(ang.Value('circle'));
// Output 0.125

console.log(ang.Value('length'));
// Output r * Math.PI * 0.25

console.log(ang.L());
// Output r * Math.PI * 0.25

Attributes borrowed from class Sector:

anglePoint, center, label, radiusPoint, selection

Attributes borrowed from class JXG.Curve:

lineCap

Attributes borrowed from class JXG.GeometryElement:

dash, dashScale, draft, dragToTopOfLayer, fillColor, fillOpacity, fixed, frozen, gradient, gradientAngle, gradientCX, gradientCY, gradientEndOffset, gradientFR, gradientFX, gradientFY, gradientR, gradientSecondColor, gradientSecondOpacity, gradientStartOffset, highlight, highlightFillColor, highlightFillOpacity, highlightStrokeColor, highlightStrokeOpacity, highlightStrokeWidth, isLabel, layer, needsRegularUpdate, nonnegativeOnly, precision, priv, rotatable, scalable, shadow, snapToGrid, strokeColor, strokeOpacity, strokeWidth, tabindex, trace, traceAttributes, transitionDuration, transitionProperties, viewport, visible, withLabel

Fields borrowed from class Sector:

point1, point2, point3, point4

Fields borrowed from class JXG.Curve:

dataX, dataY, numberPoints, qdt, ticks

Fields borrowed from class JXG.GeometryElement:

_org_type, _pos, ancestors, baseElement, board, childElements, descendants, dump, elementClass, elType, hasLabel, highlighted, id, inherits, isDraggable, isReal, lastDragTime, methodMap, mouseover, name, needsUpdate, notExistingParents, numTraces, parents, quadraticform, rendNode, stdform, subs, symbolic, traces, transformations, visProp, visPropCalc

Methods borrowed from class Sector:

Area, autoRadius, hasPointSector, L, Perimeter, Radius, setPositionDirectly, setRadius

Methods borrowed from class JXG.Curve:

addTransform, allocatePoints, generateTerm, getTransformationSource, hasPoint, interpolationFunctionFromArray, maxX, minX, moveTo, notifyParents, update, updateCurve, updateDataArray, updateRenderer, updateTransform, X, Y, Z

Methods borrowed from class JXG.GeometryElement:

_set, addChild, addDescendants, addParents, addParentsFromJCFunctions, addRotation, addTicks, animate, bounds, clearTrace, cloneToBackground, countChildren, createGradient, createLabel, draggable, formatNumberLocale, fullUpdate, generatePolynomial, getAttribute, getAttributes, getLabelAnchor, getName, getParents, getProperty, getSnapSizes, getTextAnchor, getType, handleSnapToGrid, hide, hideElement, noHighlight, normalize, prepareUpdate, remove, removeAllTicks, removeChild, removeDescendants, removeTicks, resolveShortcuts, setArrow, setAttribute, setDash, setDisplayRendNode, setLabel, setLabelText, setName, setParents, setPosition, setProperty, show, showElement, snapToPoints, updateVisibility, useLocale

Events borrowed from class JXG.GeometryElement:

attribute, attribute:key, down, drag, keydrag, mousedown, mousedrag, mousemove, mouseout, mouseover, mouseup, move, out, over, pendown, pendrag, penup, touchdown, touchdrag, touchup, up