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liabru-matter-js/examples/softBody.js

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JavaScript

var Example = Example || {};
Example.softBody = function() {
var Engine = Matter.Engine,
Render = Matter.Render,
Runner = Matter.Runner,
Composites = Matter.Composites,
MouseConstraint = Matter.MouseConstraint,
Mouse = Matter.Mouse,
Composite = Matter.Composite,
Bodies = Matter.Bodies;
// create engine
var engine = Engine.create(),
world = engine.world;
// create renderer
var render = Render.create({
element: document.body,
engine: engine,
options: {
width: 800,
height: 600,
showAngleIndicator: false
}
});
Render.run(render);
// create runner
var runner = Runner.create();
Runner.run(runner, engine);
// add bodies
var particleOptions = {
friction: 0.05,
frictionStatic: 0.1,
render: { visible: true }
};
Composite.add(world, [
// see softBody function defined later in this file
Example.softBody.softBody(250, 100, 5, 5, 0, 0, true, 18, particleOptions),
Example.softBody.softBody(400, 300, 8, 3, 0, 0, true, 15, particleOptions),
Example.softBody.softBody(250, 400, 4, 4, 0, 0, true, 15, particleOptions),
// walls
Bodies.rectangle(400, 0, 800, 50, { isStatic: true }),
Bodies.rectangle(400, 600, 800, 50, { isStatic: true }),
Bodies.rectangle(800, 300, 50, 600, { isStatic: true }),
Bodies.rectangle(0, 300, 50, 600, { isStatic: true })
]);
// add mouse control
var mouse = Mouse.create(render.canvas),
mouseConstraint = MouseConstraint.create(engine, {
mouse: mouse,
constraint: {
stiffness: 0.9,
render: {
visible: false
}
}
});
Composite.add(world, mouseConstraint);
// keep the mouse in sync with rendering
render.mouse = mouse;
// fit the render viewport to the scene
Render.lookAt(render, {
min: { x: 0, y: 0 },
max: { x: 800, y: 600 }
});
// context for MatterTools.Demo
return {
engine: engine,
runner: runner,
render: render,
canvas: render.canvas,
stop: function() {
Matter.Render.stop(render);
Matter.Runner.stop(runner);
}
};
};
Example.softBody.title = 'Soft Body';
Example.softBody.for = '>=0.14.2';
/**
* Creates a simple soft body like object.
* @method softBody
* @param {number} xx
* @param {number} yy
* @param {number} columns
* @param {number} rows
* @param {number} columnGap
* @param {number} rowGap
* @param {boolean} crossBrace
* @param {number} particleRadius
* @param {} particleOptions
* @param {} constraintOptions
* @return {composite} A new composite softBody
*/
Example.softBody.softBody = function(xx, yy, columns, rows, columnGap, rowGap, crossBrace, particleRadius, particleOptions, constraintOptions) {
var Common = Matter.Common,
Composites = Matter.Composites,
Bodies = Matter.Bodies;
particleOptions = Common.extend({ inertia: Infinity }, particleOptions);
constraintOptions = Common.extend({ stiffness: 0.2, render: { type: 'line', anchors: false } }, constraintOptions);
var softBody = Composites.stack(xx, yy, columns, rows, columnGap, rowGap, function(x, y) {
return Bodies.circle(x, y, particleRadius, particleOptions);
});
Composites.mesh(softBody, columns, rows, crossBrace, constraintOptions);
softBody.label = 'Soft Body';
return softBody;
};
if (typeof module !== 'undefined') {
module.exports = Example.softBody;
}