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added Render.startViewTransform and Render.endViewTransform

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liabru 2016-11-20 23:27:05 +00:00
parent 47443b3362
commit c8e5d5c3b0
1 changed files with 26 additions and 8 deletions
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34
src/render/Render.js
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@ -256,6 +256,30 @@ var Vector = require('../geometry/Vector');
}
};
/**
* Applies viewport transforms based on `render.bounds` to a render context.
* @method startViewTransform
* @param {render} render
*/
Render.startViewTransform = function(render) {
var boundsWidth = render.bounds.max.x - render.bounds.min.x,
boundsHeight = render.bounds.max.y - render.bounds.min.y,
boundsScaleX = boundsWidth / render.options.width,
boundsScaleY = boundsHeight / render.options.height;
render.context.scale(1 / boundsScaleX, 1 / boundsScaleY);
render.context.translate(-render.bounds.min.x, -render.bounds.min.y);
};
/**
* Resets all transforms on the render context.
* @method endViewTransform
* @param {render} render
*/
Render.endViewTransform = function(render) {
render.context.setTransform(render.options.pixelRatio, 0, 0, render.options.pixelRatio, 0, 0);
};
/**
* Renders the given `engine`'s `Matter.World` object.
* This is the entry point for all rendering and should be called every time the scene changes.
@ -293,11 +317,6 @@ var Vector = require('../geometry/Vector');
// handle bounds
if (options.hasBounds) {
var boundsWidth = render.bounds.max.x - render.bounds.min.x,
boundsHeight = render.bounds.max.y - render.bounds.min.y,
boundsScaleX = boundsWidth / options.width,
boundsScaleY = boundsHeight / options.height;
// filter out bodies that are not in view
for (i = 0; i < allBodies.length; i++) {
var body = allBodies[i];
@ -324,8 +343,7 @@ var Vector = require('../geometry/Vector');
}
// transform the view
context.scale(1 / boundsScaleX, 1 / boundsScaleY);
context.translate(-render.bounds.min.x, -render.bounds.min.y);
Render.startViewTransform(render);
} else {
constraints = allConstraints;
bodies = allBodies;
@ -379,7 +397,7 @@ var Vector = require('../geometry/Vector');
if (options.hasBounds) {
// revert view transforms
context.setTransform(options.pixelRatio, 0, 0, options.pixelRatio, 0, 0);
Render.endViewTransform(render);
}
Events.trigger(render, 'afterRender', event);