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Refactor and fix canvas tile layer renderer

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Éric Lemoine
2013-04-11 09:26:57 +02:00
parent a344e4af8c
commit d1021b6ee0
1 changed files with 22 additions and 15 deletions
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37
src/ol/renderer/canvas/canvastilelayerrenderer.js
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@@ -136,42 +136,50 @@ ol.renderer.canvas.TileLayer.prototype.renderFrame =
var canvas, context;
if (goog.isNull(this.canvas_)) {
goog.asserts.assert(goog.isNull(this.canvasSize_));
goog.asserts.assert(goog.isNull(this.context_));
goog.asserts.assert(goog.isNull(this.renderedCanvasTileRange_));
canvas = /** @type {HTMLCanvasElement} */
(goog.dom.createElement(goog.dom.TagName.CANVAS));
canvas.width = canvasWidth;
canvas.height = canvasHeight;
context = /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));
this.canvas_ = canvas;
this.canvasSize_ = new ol.Size(canvasWidth, canvasHeight);
this.context_ = context;
this.renderedCanvasTileRange_ = null;
} else {
goog.asserts.assert(!goog.isNull(this.canvasSize_));
goog.asserts.assert(!goog.isNull(this.context_));
canvas = this.canvas_;
context = this.context_;
if (this.canvasSize_.width < canvasWidth ||
this.canvasSize_.height < canvasHeight) {
// Canvas is too small, make it bigger
canvas.width = canvasWidth;
canvas.height = canvasHeight;
this.canvasSize_.width = canvasWidth;
this.canvasSize_.height = canvasHeight;
this.renderedCanvasTileRange_ = null;
} else if (z != this.renderedCanvasZ_ ||
!this.renderedCanvasTileRange_.containsTileRange(tileRange)) {
this.renderedCanvasTileRange_ = null;
} else {
canvasWidth = this.canvasSize_.width;
canvasHeight = this.canvasSize_.height;
if (z != this.renderedCanvasZ_ ||
!this.renderedCanvasTileRange_.containsTileRange(tileRange)) {
this.renderedCanvasTileRange_ = null;
}
}
if (goog.isNull(this.renderedCanvasTileRange_)) {
context.clearRect(0, 0, canvasWidth, canvasHeight);
}
}
var canvasTileRange, canvasTileRangeWidth, minX, minY;
if (z != this.renderedCanvasZ_ ||
goog.isNull(this.renderedCanvasTileRange_)) {
if (goog.isNull(this.canvasSize_)) {
this.canvasSize_ = new ol.Size(canvasWidth, canvasHeight);
} else {
this.canvasSize_.width = canvasWidth;
this.canvasSize_.height = canvasHeight;
}
if (goog.isNull(this.renderedCanvasTileRange_)) {
canvasTileRangeWidth = canvasWidth / tileSize.width;
var canvasTileRangeHeight = canvasHeight / tileSize.height;
minX = tileRange.minX +
minX = tileRange.minX -
Math.floor((canvasTileRangeWidth - tileRange.getWidth()) / 2);
minY = tileRange.minY +
minY = tileRange.minY -
Math.floor((canvasTileRangeHeight - tileRange.getHeight()) / 2);
this.renderedCanvasZ_ = z;
this.renderedCanvasTileRange_ = new ol.TileRange(
@@ -185,7 +193,6 @@ ol.renderer.canvas.TileLayer.prototype.renderFrame =
canvasTileRangeWidth = canvasTileRange.getWidth();
}
goog.asserts.assert(!goog.isNull(this.canvasSize_));
goog.asserts.assert(canvasTileRange.containsTileRange(tileRange));
/**