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