dojox
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Dojo eXtensions, a rollup of many useful sub-projects and varying states of maturity – from very stable and robust, to alpha and experimental. See individual projects contain README files for details.
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HTML
<html>
<head>
<title>Test Reflection and Projection matrices</title>
<style>
@import "../../../dojo/resources/dojo.css";
@import "../../../dijit/themes/tundra/tundra.css";
</style>
<script src="../../../dojo/dojo.js" data-dojo-config="isDebug: true, parseOnLoad: true"></script>
<script>
dojo.require("dojox.gfx");
dojo.require("dojo.colors");
dojo.require("dijit.form.HorizontalSlider");
dojo.require("dijit.form.HorizontalRule");
dojo.require("dijit.form.HorizontalRuleLabels");
var W = 500, H = 500, MARKER_SIZE = 5;
function makeGrid(group, size, step, stroke){
var g = group.createGroup();
stroke = stroke || {color: [0, 0, 0, 0.1], width: 1};
for(var i = step; i < size; i += step){
g.createLine({x1: 0, y1: i, x2: size, y2: i}).setStroke(stroke);
g.createLine({x1: i, y1: 0, x2: i, y2: size}).setStroke(stroke);
}
g.createRect({x: 0, y: 0, width: size - 1, height: size -1}).setStroke("black");
return g;
}
var surface, shape, line = {x1: 0, y1: 0, x2: W, y2: H},
rm, pm, pt, rpt, ppt, point, rpoint, ppoint, rline, pline;
function updatePoints(){
// get all transforms
rm = dojox.gfx.matrix.reflect(line.x2, line.y2);
pm = dojox.gfx.matrix.project(line.x2, line.y2);
// update points and lines
if(point){
rpt = dojox.gfx.matrix.multiplyPoint(rm, pt);
ppt = dojox.gfx.matrix.multiplyPoint(pm, pt);
point.setShape({cx: pt.x, cy: pt.y, r: MARKER_SIZE});
rpoint.setShape({cx: rpt.x, cy: rpt.y, r: MARKER_SIZE});
ppoint.setShape({cx: ppt.x, cy: ppt.y, r: MARKER_SIZE});
rline.setShape({x1: pt.x, y1: pt.y, x2: rpt.x, y2: rpt.y});
pline.setShape({x1: pt.x, y1: pt.y, x2: ppt.x, y2: ppt.y});
}
}
function shiftVector(value){
// update the line
if(value < 0){
line.y2 = H;
line.x2 = W + (W / 100) * value;
}else{
line.x2 = W;
line.y2 = H - (H / 100) * value;
}
shape.setShape(line);
updatePoints();
}
function setPoint(e){
var bbox = dojo.position("surf", true);
pt = {x: e.pageX - bbox.x, y: e.pageY - bbox.y};
if(!point){
point = surface.createCircle({cx: 0, cy: 0, r: MARKER_SIZE}).
setStroke("black").setFill("yellow");
rpoint = surface.createCircle({cx: 0, cy: 0, r: MARKER_SIZE}).
setStroke("black").setFill("red");
ppoint = surface.createCircle({cx: 0, cy: 0, r: MARKER_SIZE}).
setStroke("black").setFill("green");
rline = surface.createLine({x1: 0, y1: 0, x2: 0, y2: 0}).
setStroke("red");
pline = surface.createLine({x1: 0, y1: 0, x2: 0, y2: 0}).
setStroke({color: "green", style: "dash"});
}
updatePoints();
}
run = function(surface){
makeGrid(surface, W, 50);
shape = surface.createLine(line).setStroke("black");
dojo.connect(dijit.byId("shifter"), "onChange", shiftVector);
dojo.connect(dojo.byId("surf"), "onclick", setPoint);
shiftVector(0);
};
createSurface = function(){
surface = dojox.gfx.createSurface("surf", W, H);
surface.whenLoaded(run);
};
dojo.addOnLoad(createSurface);
</script>
</head>
<body class="tundra">
<h1>Test Reflection and Projection matrices</h1>
<div id="shifter" dojoType="dijit.form.HorizontalSlider"
value="0" minimum="-100" maximum="100" value="0" discreteValues="21" showButtons="false" intermediateChanges="true" style="width: 500px;">
<div dojoType="dijit.form.HorizontalRule" container="topDecoration" count="21" style="height: 5px;"></div>
<div dojoType="dijit.form.HorizontalRule" container="bottomDecoration" count="5" style="height: 5px;"></div>
<div dojoType="dijit.form.HorizontalRuleLabels" container="bottomDecoration" labels="-100,-50,0,50,100" style="height: 1.2em; font-size: 75%; color: gray;"></div>
</div>
<div id="surf"></div>
<p>Legend: <span style="background: yellow;">yellow</span> is your point, <span style="color: red;">red</span> is a reflected point,
<span style="color: green;">green</span> is a projected point.</p>
<p>Click anywhere on the surface to set a point and see its reflection and projection.</p>
</body>
</html>