Element Inequality
JXG.GeometryElement
↳ JXG.Curve
↳ Inequality
Creates an area indicating the solution of a linear inequality or an inequality
of a function graph, i.e. an inequality of type y <= f(x).
Defined in: composition.js.
Extends
JXG.Curve.
| Constructor Attributes | Constructor Name and Description |
|---|---|
|
Display the solution set of a linear inequality (less than or equal to).
|
| Field Attributes | Field Name and Description |
|---|---|
|
By default an inequality is less (or equal) than.
|
- 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, setPositionDirectly, 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
Element Detail
Inequality
Display the solution set of a linear inequality (less than or equal to).
To be precise, the solution set of the inequality y <= b/a * x + c/a is shown.
In case a = 0, that is if the equation of the line is bx + c = 0,
the area of the inequality bx + c <= 0 is shown.
For function graphs the area below the function graph is filled, i.e. the area of the inequality y <= f(x). With the attribute inverse:true the area of the inequality y >= f(x) is filled.
-
This element has no direct constructor. To create an instance of this element you have to call JXG.Board#create
with type "inequality".
- Possible parent array combinations are:
-
{JXG.Line} l
- The area drawn will be the area below this line. With the attribute inverse:true, the inequality 'greater than or equal to' is shown.
- Throws:
- {Error}
- If the element cannot be constructed with the given parent objects an exception is thrown.
- Examples:
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});
var f = board.create('functiongraph', ['sin(x)', -2*Math.PI, 2*Math.PI]);
var ineq_lower = board.create('inequality', [f]);
var ineq_greater = board.create('inequality', [f], {inverse: true, fillColor: 'yellow'});
Attribute Detail
{Boolean}
inverse
By default an inequality is less (or equal) than. Set inverse to true will consider the inequality
greater (or equal) than.
Defined in: options.js.
Defined in: options.js.
- Default Value:
- false
Attributes borrowed from other Elements
- 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 other Elements
- 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, type, visProp, visPropCalc
Methods borrowed from other Elements
- 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, setPositionDirectly, setProperty, show, showElement, snapToPoints, updateVisibility, useLocale
Events borrowed from other Elements