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<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office">
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<head>
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<title>dojo.gfx: 100 draggable circles</title>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
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<script language="JavaScript" type="text/javascript">
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//djConfig = { isDebug: true };
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</script>
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<script type="text/javascript" src="../../dojo.js"></script>
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<script type="text/javascript">
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dojo.require("dojo.gfx.*");
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dojo.require("dojo.event.*");
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dojo.require("dojo.html.layout");
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dojo.require("dojo.html.style");
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dojo.require('dojo.debug.console');
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var container = null;
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var container_position = null;
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var surface = null;
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var surface_size = null;
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function getRand(from, to)
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{
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return Math.random() * (to - from) + from;
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}
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var skew_stat_factor = 15;
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function getRandSkewed(from, to)
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{
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// let skew stats to smaller values
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var seed = 0;
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for(var i = 0; i < skew_stat_factor; ++i){
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seed += Math.random();
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}
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seed = 2 * Math.abs(seed / skew_stat_factor - 0.5);
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return seed * (to - from) + from;
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}
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function randColor(alpha)
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{
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var red = Math.floor(getRand(0, 255));
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var green = Math.floor(getRand(0, 255));
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var blue = Math.floor(getRand(0, 255));
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var opacity = 1;
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if (alpha) {
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opacity = getRand(0.1, 1);
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}
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return [red, green, blue, opacity];
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}
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var gShapes = {}
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var gShapeCounter = 0;
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function makeCircleGrid(itemCount)
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{
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var minR = 10, maxR = surface_size.width / 3;
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for (var j = 0; j < itemCount; ++j) {
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var r = getRandSkewed(minR, maxR);
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var cx = getRand(r, surface_size.width - r);
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var cy = getRand(r, surface_size.height - r);
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var id = "shape_" + (gShapeCounter++);
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var aShape = surface.createCircle({cx: cx, cy: cy, r: r})
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.setFill(randColor(true))
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.setStroke({color: randColor(1), width: getRand(3)})
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;
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aShape.getEventSource().setAttribute('shapeid', id);
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dojo.html.setClass(aShape.getEventSource(), "movable");
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gShapes[id] = aShape;
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}
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}
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var current_shape = null;
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var current_shape_window = null;
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var last_position = null;
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function getShape(event)
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{
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var id = event.target.getAttribute('shapeid');
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var s = id ? gShapes[id] : null;
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return s;
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}
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function handleMouseDown(event)
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{
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var shape = getShape(event);
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if (shape) {
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current_shape = shape;
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last_position = {
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x: event.clientX - container_position.x,
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y: event.clientY - container_position.y
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};
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var params = shape.getShape();
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var center = dojo.gfx.matrix.multiplyPoint(shape.getTransform(), params.cx, params.cy);
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var dx = last_position.x - center.x;
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var dy = last_position.y - center.y;
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var r = params.r;
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current_shape_window = {
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x1: r + dx,
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y1: r + dy,
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x2: surface_size.width - r + dx,
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y2: surface_size.height - r + dy
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};
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}
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dojo.event.browser.stopEvent(event);
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}
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function handleMouseMove(event)
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{
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if(!current_shape) return;
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var x = Math.min(Math.max(event.clientX - container_position.x, current_shape_window.x1), current_shape_window.x2);
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var y = Math.min(Math.max(event.clientY - container_position.y, current_shape_window.y1), current_shape_window.y2);
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current_shape.applyTransform({dx: x - last_position.x, dy: y - last_position.y});
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last_position = {x: x, y: y};
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dojo.event.browser.stopEvent(event);
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}
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function handleMouseUp(event)
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{
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current_shape = null;
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dojo.event.browser.stopEvent(event);
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}
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function initGfx() {
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container = dojo.byId("gfx_holder");
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container_position = dojo.html.abs(container);
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surface = dojo.gfx.createSurface(container, 500, 500);
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surface_size = surface.getDimensions();
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surface_size.width = parseInt(surface_size.width);
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surface_size.height = parseInt(surface_size.height);
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makeCircleGrid(100);
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dojo.event.connect(container, 'onmousedown', handleMouseDown);
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dojo.event.connect(container, 'onmousemove', handleMouseMove);
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dojo.event.connect(container, 'onmouseup', handleMouseUp);
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}
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dojo.addOnLoad(initGfx);
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</script>
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<style type="text/css">
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.movable { cursor: hand; }
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</style>
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</head>
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|
|
|
<body>
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<h1>dojo.gfx: 100 draggable circles</h1>
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<div id="gfx_holder" style="width: 500px; height: 500px;"></div>
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</body>
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</html>
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