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vectorlayer.js
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vectorlayer.js
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goog.provide('ol.renderer.canvas.VectorLayer');
goog.require('ol');
goog.require('ol.View');
goog.require('ol.dom');
goog.require('ol.extent');
goog.require('ol.render.Event');
goog.require('ol.render.canvas');
goog.require('ol.render.canvas.ReplayGroup');
goog.require('ol.renderer.canvas.Layer');
goog.require('ol.renderer.vector');
/**
* @constructor
* @extends {ol.renderer.canvas.Layer}
* @param {ol.layer.Vector} vectorLayer Vector layer.
*/
ol.renderer.canvas.VectorLayer = function(vectorLayer) {
ol.renderer.canvas.Layer.call(this, vectorLayer);
/**
* @private
* @type {boolean}
*/
this.dirty_ = false;
/**
* @private
* @type {number}
*/
this.renderedRevision_ = -1;
/**
* @private
* @type {number}
*/
this.renderedResolution_ = NaN;
/**
* @private
* @type {ol.Extent}
*/
this.renderedExtent_ = ol.extent.createEmpty();
/**
* @private
* @type {function(ol.Feature, ol.Feature): number|null}
*/
this.renderedRenderOrder_ = null;
/**
* @private
* @type {ol.render.canvas.ReplayGroup}
*/
this.replayGroup_ = null;
/**
* @private
* @type {CanvasRenderingContext2D}
*/
this.context_ = ol.dom.createCanvasContext2D();
};
ol.inherits(ol.renderer.canvas.VectorLayer, ol.renderer.canvas.Layer);
/**
* @inheritDoc
*/
ol.renderer.canvas.VectorLayer.prototype.composeFrame = function(frameState, layerState, context) {
var extent = frameState.extent;
var pixelRatio = frameState.pixelRatio;
var skippedFeatureUids = layerState.managed ?
frameState.skippedFeatureUids : {};
var viewState = frameState.viewState;
var projection = viewState.projection;
var rotation = viewState.rotation;
var projectionExtent = projection.getExtent();
var vectorSource = /** @type {ol.source.Vector} */ (this.getLayer().getSource());
var transform = this.getTransform(frameState, 0);
this.preCompose(context, frameState, transform);
// clipped rendering if layer extent is set
var clipExtent = layerState.extent;
var clipped = clipExtent !== undefined;
if (clipped) {
this.clip(context, frameState, /** @type {ol.Extent} */ (clipExtent));
}
var replayGroup = this.replayGroup_;
if (replayGroup && !replayGroup.isEmpty()) {
var layer = this.getLayer();
var drawOffsetX = 0;
var drawOffsetY = 0;
var replayContext;
if (layer.hasListener(ol.render.Event.Type.RENDER)) {
var drawWidth = context.canvas.width;
var drawHeight = context.canvas.height;
if (rotation) {
var drawSize = Math.round(Math.sqrt(drawWidth * drawWidth + drawHeight * drawHeight));
drawOffsetX = (drawSize - drawWidth) / 2;
drawOffsetY = (drawSize - drawHeight) / 2;
drawWidth = drawHeight = drawSize;
}
// resize and clear
this.context_.canvas.width = drawWidth;
this.context_.canvas.height = drawHeight;
replayContext = this.context_;
} else {
replayContext = context;
}
// for performance reasons, context.save / context.restore is not used
// to save and restore the transformation matrix and the opacity.
// see http://jsperf.com/context-save-restore-versus-variable
var alpha = replayContext.globalAlpha;
replayContext.globalAlpha = layerState.opacity;
if (replayContext != context) {
replayContext.translate(drawOffsetX, drawOffsetY);
}
var width = frameState.size[0] * pixelRatio;
var height = frameState.size[1] * pixelRatio;
ol.render.canvas.rotateAtOffset(replayContext, -rotation,
width / 2, height / 2);
replayGroup.replay(replayContext, pixelRatio, transform, rotation,
skippedFeatureUids);
if (vectorSource.getWrapX() && projection.canWrapX() &&
!ol.extent.containsExtent(projectionExtent, extent)) {
var startX = extent[0];
var worldWidth = ol.extent.getWidth(projectionExtent);
var world = 0;
var offsetX;
while (startX < projectionExtent[0]) {
--world;
offsetX = worldWidth * world;
transform = this.getTransform(frameState, offsetX);
replayGroup.replay(replayContext, pixelRatio, transform, rotation,
skippedFeatureUids);
startX += worldWidth;
}
world = 0;
startX = extent[2];
while (startX > projectionExtent[2]) {
++world;
offsetX = worldWidth * world;
transform = this.getTransform(frameState, offsetX);
replayGroup.replay(replayContext, pixelRatio, transform, rotation,
skippedFeatureUids);
startX -= worldWidth;
}
// restore original transform for render and compose events
transform = this.getTransform(frameState, 0);
}
ol.render.canvas.rotateAtOffset(replayContext, rotation,
width / 2, height / 2);
if (replayContext != context) {
this.dispatchRenderEvent(replayContext, frameState, transform);
context.drawImage(replayContext.canvas, -drawOffsetX, -drawOffsetY);
replayContext.translate(-drawOffsetX, -drawOffsetY);
}
replayContext.globalAlpha = alpha;
}
if (clipped) {
context.restore();
}
this.postCompose(context, frameState, layerState, transform);
};
/**
* @inheritDoc
*/
ol.renderer.canvas.VectorLayer.prototype.forEachFeatureAtCoordinate = function(coordinate, frameState, hitTolerance, callback, thisArg) {
if (!this.replayGroup_) {
return undefined;
} else {
var resolution = frameState.viewState.resolution;
var rotation = frameState.viewState.rotation;
var layer = this.getLayer();
/** @type {Object.<string, boolean>} */
var features = {};
return this.replayGroup_.forEachFeatureAtCoordinate(coordinate, resolution,
rotation, hitTolerance, {},
/**
* @param {ol.Feature|ol.render.Feature} feature Feature.
* @return {?} Callback result.
*/
function(feature) {
var key = ol.getUid(feature).toString();
if (!(key in features)) {
features[key] = true;
return callback.call(thisArg, feature, layer);
}
});
}
};
/**
* Handle changes in image style state.
* @param {ol.events.Event} event Image style change event.
* @private
*/
ol.renderer.canvas.VectorLayer.prototype.handleStyleImageChange_ = function(event) {
this.renderIfReadyAndVisible();
};
/**
* @inheritDoc
*/
ol.renderer.canvas.VectorLayer.prototype.prepareFrame = function(frameState, layerState) {
var vectorLayer = /** @type {ol.layer.Vector} */ (this.getLayer());
var vectorSource = vectorLayer.getSource();
this.updateAttributions(
frameState.attributions, vectorSource.getAttributions());
this.updateLogos(frameState, vectorSource);
var animating = frameState.viewHints[ol.View.Hint.ANIMATING];
var interacting = frameState.viewHints[ol.View.Hint.INTERACTING];
var updateWhileAnimating = vectorLayer.getUpdateWhileAnimating();
var updateWhileInteracting = vectorLayer.getUpdateWhileInteracting();
if (!this.dirty_ && (!updateWhileAnimating && animating) ||
(!updateWhileInteracting && interacting)) {
return true;
}
var frameStateExtent = frameState.extent;
var viewState = frameState.viewState;
var projection = viewState.projection;
var resolution = viewState.resolution;
var pixelRatio = frameState.pixelRatio;
var vectorLayerRevision = vectorLayer.getRevision();
var vectorLayerRenderBuffer = vectorLayer.getRenderBuffer();
var vectorLayerRenderOrder = vectorLayer.getRenderOrder();
if (vectorLayerRenderOrder === undefined) {
vectorLayerRenderOrder = ol.renderer.vector.defaultOrder;
}
var extent = ol.extent.buffer(frameStateExtent,
vectorLayerRenderBuffer * resolution);
var projectionExtent = viewState.projection.getExtent();
if (vectorSource.getWrapX() && viewState.projection.canWrapX() &&
!ol.extent.containsExtent(projectionExtent, frameState.extent)) {
// For the replay group, we need an extent that intersects the real world
// (-180° to +180°). To support geometries in a coordinate range from -540°
// to +540°, we add at least 1 world width on each side of the projection
// extent. If the viewport is wider than the world, we need to add half of
// the viewport width to make sure we cover the whole viewport.
var worldWidth = ol.extent.getWidth(projectionExtent);
var buffer = Math.max(ol.extent.getWidth(extent) / 2, worldWidth);
extent[0] = projectionExtent[0] - buffer;
extent[2] = projectionExtent[2] + buffer;
}
if (!this.dirty_ &&
this.renderedResolution_ == resolution &&
this.renderedRevision_ == vectorLayerRevision &&
this.renderedRenderOrder_ == vectorLayerRenderOrder &&
ol.extent.containsExtent(this.renderedExtent_, extent)) {
return true;
}
this.replayGroup_ = null;
this.dirty_ = false;
var replayGroup =
new ol.render.canvas.ReplayGroup(
ol.renderer.vector.getTolerance(resolution, pixelRatio), extent,
resolution, vectorSource.getOverlaps(), vectorLayer.getRenderBuffer());
vectorSource.loadFeatures(extent, resolution, projection);
/**
* @param {ol.Feature} feature Feature.
* @this {ol.renderer.canvas.VectorLayer}
*/
var renderFeature = function(feature) {
var styles;
var styleFunction = feature.getStyleFunction();
if (styleFunction) {
styles = styleFunction.call(feature, resolution);
} else {
styleFunction = vectorLayer.getStyleFunction();
if (styleFunction) {
styles = styleFunction(feature, resolution);
}
}
if (styles) {
var dirty = this.renderFeature(
feature, resolution, pixelRatio, styles, replayGroup);
this.dirty_ = this.dirty_ || dirty;
}
};
if (vectorLayerRenderOrder) {
/** @type {Array.<ol.Feature>} */
var features = [];
vectorSource.forEachFeatureInExtent(extent,
/**
* @param {ol.Feature} feature Feature.
*/
function(feature) {
features.push(feature);
}, this);
features.sort(vectorLayerRenderOrder);
features.forEach(renderFeature, this);
} else {
vectorSource.forEachFeatureInExtent(extent, renderFeature, this);
}
replayGroup.finish();
this.renderedResolution_ = resolution;
this.renderedRevision_ = vectorLayerRevision;
this.renderedRenderOrder_ = vectorLayerRenderOrder;
this.renderedExtent_ = extent;
this.replayGroup_ = replayGroup;
return true;
};
/**
* @param {ol.Feature} feature Feature.
* @param {number} resolution Resolution.
* @param {number} pixelRatio Pixel ratio.
* @param {(ol.style.Style|Array.<ol.style.Style>)} styles The style or array of
* styles.
* @param {ol.render.canvas.ReplayGroup} replayGroup Replay group.
* @return {boolean} `true` if an image is loading.
*/
ol.renderer.canvas.VectorLayer.prototype.renderFeature = function(feature, resolution, pixelRatio, styles, replayGroup) {
if (!styles) {
return false;
}
var loading = false;
if (Array.isArray(styles)) {
for (var i = 0, ii = styles.length; i < ii; ++i) {
loading = ol.renderer.vector.renderFeature(
replayGroup, feature, styles[i],
ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
this.handleStyleImageChange_, this) || loading;
}
} else {
loading = ol.renderer.vector.renderFeature(
replayGroup, feature, styles,
ol.renderer.vector.getSquaredTolerance(resolution, pixelRatio),
this.handleStyleImageChange_, this) || loading;
}
return loading;
};