phaser/src/gameobjects/particles/ParticleManagerCanvasRenderer.js

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/**
* @author Richard Davey <rich@photonstorm.com>
* @copyright 2018 Photon Storm Ltd.
* @license {@link https://github.com/photonstorm/phaser/blob/master/license.txt|MIT License}
*/
var GameObject = require('../GameObject');
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/**
* Renders this Game Object with the Canvas Renderer to the given Camera.
* The object will not render if any of its renderFlags are set or it is being actively filtered out by the Camera.
* This method should not be called directly. It is a utility function of the Render module.
*
* @method Phaser.GameObjects.Particles.EmitterManager#renderCanvas
* @since 3.0.0
* @private
*
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* @param {Phaser.Renderer.Canvas.CanvasRenderer} renderer - A reference to the current active Canvas renderer.
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* @param {Phaser.GameObjects.Particles} emitterManager - The Game Object being rendered in this call.
* @param {number} interpolationPercentage - Reserved for future use and custom pipelines.
* @param {Phaser.Cameras.Scene2D.Camera} camera - The Camera that is rendering the Game Object.
*/
var ParticleManagerCanvasRenderer = function (renderer, emitterManager, interpolationPercentage, camera)
{
var emitters = emitterManager.emitters.list;
if (emitters.length === 0 || GameObject.RENDER_MASK !== emitterManager.renderFlags || (emitterManager.cameraFilter > 0 && (emitterManager.cameraFilter & camera._id)))
{
return;
}
for (var i = 0; i < emitters.length; i++)
{
var emitter = emitters[i];
var particles = emitter.alive;
var length = particles.length;
if (!emitter.visible || length === 0)
{
continue;
}
var ctx = renderer.currentContext;
var lastAlpha = ctx.globalAlpha;
var cameraScrollX = camera.scrollX * emitter.scrollFactorX;
var cameraScrollY = camera.scrollY * emitter.scrollFactorY;
if (renderer.currentBlendMode !== emitter.blendMode)
{
renderer.currentBlendMode = emitter.blendMode;
ctx.globalCompositeOperation = renderer.blendModes[emitter.blendMode];
}
var roundPixels = renderer.config.roundPixels;
for (var index = 0; index < length; ++index)
{
var particle = particles[index];
var alpha = ((particle.color >> 24) & 0xFF) / 255.0;
if (alpha <= 0)
{
continue;
}
var frame = particle.frame;
var width = frame.width;
var height = frame.height;
var ox = width * 0.5;
var oy = height * 0.5;
var cd = frame.canvasData;
var x = -ox;
var y = -oy;
var tx = particle.x - cameraScrollX * particle.scrollFactorX;
var ty = particle.y - cameraScrollY * particle.scrollFactorY;
if (roundPixels)
{
tx |= 0;
ty |= 0;
}
ctx.globalAlpha = alpha;
ctx.save();
ctx.translate(tx, ty);
ctx.rotate(particle.rotation);
ctx.scale(particle.scaleX, particle.scaleY);
ctx.drawImage(frame.source.image, cd.sx, cd.sy, cd.sWidth, cd.sHeight, x, y, cd.dWidth, cd.dHeight);
ctx.restore();
}
ctx.globalAlpha = lastAlpha;
}
};
module.exports = ParticleManagerCanvasRenderer;