Tom Payne
69 lines
2.1 KiB
JavaScript
69 lines
2.1 KiB
JavaScript
goog.provide('ol.renderer.canvas.Layer');
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goog.require('goog.vec.Mat4');
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goog.require('ol.layer.Layer');
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goog.require('ol.renderer.Layer');
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/**
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* @constructor
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* @extends {ol.renderer.Layer}
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* @param {ol.renderer.Map} mapRenderer Map renderer.
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* @param {ol.layer.Layer} layer Layer.
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*/
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ol.renderer.canvas.Layer = function(mapRenderer, layer) {
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goog.base(this, mapRenderer, layer);
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};
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goog.inherits(ol.renderer.canvas.Layer, ol.renderer.Layer);
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/**
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* @param {ol.FrameState} frameState Frame state.
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* @param {ol.layer.LayerState} layerState Layer state.
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* @param {CanvasRenderingContext2D} context Context.
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*/
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ol.renderer.canvas.Layer.prototype.composeFrame =
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function(frameState, layerState, context) {
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var image = this.getImage();
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if (!goog.isNull(image)) {
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var transform = this.getTransform();
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context.globalAlpha = layerState.opacity;
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// for performance reasons, context.setTransform is only used
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// when the view is rotated. see http://jsperf.com/canvas-transform
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if (frameState.view2DState.rotation === 0) {
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var dx = goog.vec.Mat4.getElement(transform, 0, 3);
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var dy = goog.vec.Mat4.getElement(transform, 1, 3);
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var dw = image.width * goog.vec.Mat4.getElement(transform, 0, 0);
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var dh = image.height * goog.vec.Mat4.getElement(transform, 1, 1);
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context.drawImage(image, 0, 0, +image.width, +image.height,
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Math.round(dx), Math.round(dy), Math.round(dw), Math.round(dh));
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} else {
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context.setTransform(
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goog.vec.Mat4.getElement(transform, 0, 0),
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goog.vec.Mat4.getElement(transform, 1, 0),
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goog.vec.Mat4.getElement(transform, 0, 1),
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goog.vec.Mat4.getElement(transform, 1, 1),
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goog.vec.Mat4.getElement(transform, 0, 3),
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goog.vec.Mat4.getElement(transform, 1, 3));
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context.drawImage(image, 0, 0);
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context.setTransform(1, 0, 0, 1, 0, 0);
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}
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}
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};
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/**
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* @return {HTMLCanvasElement|HTMLVideoElement|Image} Canvas.
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*/
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ol.renderer.canvas.Layer.prototype.getImage = goog.abstractMethod;
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/**
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* @return {!goog.vec.Mat4.Number} Transform.
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*/
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ol.renderer.canvas.Layer.prototype.getTransform = goog.abstractMethod;
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