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| goog.provide('ol.renderer.canvas.Layer');
goog.require('ol');
goog.require('ol.extent');
goog.require('ol.functions');
goog.require('ol.render.Event');
goog.require('ol.render.EventType');
goog.require('ol.render.canvas');
goog.require('ol.render.canvas.Immediate');
goog.require('ol.renderer.Layer');
goog.require('ol.transform');
/**
* @constructor
* @abstract
* @extends {ol.renderer.Layer}
* @param {ol.layer.Layer} layer Layer.
*/
ol.renderer.canvas.Layer = function(layer) {
ol.renderer.Layer.call(this, layer);
/**
* @protected
* @type {number}
*/
this.renderedResolution;
/**
* @private
* @type {ol.Transform}
*/
this.transform_ = ol.transform.create();
};
ol.inherits(ol.renderer.canvas.Layer, ol.renderer.Layer);
/**
* @param {CanvasRenderingContext2D} context Context.
* @param {olx.FrameState} frameState Frame state.
* @param {ol.Extent} extent Clip extent.
* @protected
*/
ol.renderer.canvas.Layer.prototype.clip = function(context, frameState, extent) {
var pixelRatio = frameState.pixelRatio;
var width = frameState.size[0] * pixelRatio;
var height = frameState.size[1] * pixelRatio;
var rotation = frameState.viewState.rotation;
var topLeft = ol.extent.getTopLeft(/** @type {ol.Extent} */ (extent));
var topRight = ol.extent.getTopRight(/** @type {ol.Extent} */ (extent));
var bottomRight = ol.extent.getBottomRight(/** @type {ol.Extent} */ (extent));
var bottomLeft = ol.extent.getBottomLeft(/** @type {ol.Extent} */ (extent));
ol.transform.apply(frameState.coordinateToPixelTransform, topLeft);
ol.transform.apply(frameState.coordinateToPixelTransform, topRight);
ol.transform.apply(frameState.coordinateToPixelTransform, bottomRight);
ol.transform.apply(frameState.coordinateToPixelTransform, bottomLeft);
context.save();
ol.render.canvas.rotateAtOffset(context, -rotation, width / 2, height / 2);
context.beginPath();
context.moveTo(topLeft[0] * pixelRatio, topLeft[1] * pixelRatio);
context.lineTo(topRight[0] * pixelRatio, topRight[1] * pixelRatio);
context.lineTo(bottomRight[0] * pixelRatio, bottomRight[1] * pixelRatio);
context.lineTo(bottomLeft[0] * pixelRatio, bottomLeft[1] * pixelRatio);
context.clip();
ol.render.canvas.rotateAtOffset(context, rotation, width / 2, height / 2);
};
/**
* @param {ol.render.EventType} type Event type.
* @param {CanvasRenderingContext2D} context Context.
* @param {olx.FrameState} frameState Frame state.
* @param {ol.Transform=} opt_transform Transform.
* @private
*/
ol.renderer.canvas.Layer.prototype.dispatchComposeEvent_ = function(type, context, frameState, opt_transform) {
var layer = this.getLayer();
if (layer.hasListener(type)) {
var width = frameState.size[0] * frameState.pixelRatio;
var height = frameState.size[1] * frameState.pixelRatio;
var rotation = frameState.viewState.rotation;
ol.render.canvas.rotateAtOffset(context, -rotation, width / 2, height / 2);
var transform = opt_transform !== undefined ?
opt_transform : this.getTransform(frameState, 0);
var render = new ol.render.canvas.Immediate(
context, frameState.pixelRatio, frameState.extent, transform,
frameState.viewState.rotation);
var composeEvent = new ol.render.Event(type, render, frameState,
context, null);
layer.dispatchEvent(composeEvent);
ol.render.canvas.rotateAtOffset(context, rotation, width / 2, height / 2);
}
};
/**
* @param {ol.Coordinate} coordinate Coordinate.
* @param {olx.FrameState} frameState FrameState.
* @param {function(this: S, ol.layer.Layer, (Uint8ClampedArray|Uint8Array)): T} callback Layer
* callback.
* @param {S} thisArg Value to use as `this` when executing `callback`.
* @return {T|undefined} Callback result.
* @template S,T,U
*/
ol.renderer.canvas.Layer.prototype.forEachLayerAtCoordinate = function(coordinate, frameState, callback, thisArg) {
var hasFeature = this.forEachFeatureAtCoordinate(
coordinate, frameState, 0, ol.functions.TRUE, this);
if (hasFeature) {
return callback.call(thisArg, this.getLayer(), null);
} else {
return undefined;
}
};
/**
* @param {CanvasRenderingContext2D} context Context.
* @param {olx.FrameState} frameState Frame state.
* @param {ol.LayerState} layerState Layer state.
* @param {ol.Transform=} opt_transform Transform.
* @protected
*/
ol.renderer.canvas.Layer.prototype.postCompose = function(context, frameState, layerState, opt_transform) {
this.dispatchComposeEvent_(ol.render.EventType.POSTCOMPOSE, context,
frameState, opt_transform);
};
/**
* @param {CanvasRenderingContext2D} context Context.
* @param {olx.FrameState} frameState Frame state.
* @param {ol.Transform=} opt_transform Transform.
* @protected
*/
ol.renderer.canvas.Layer.prototype.preCompose = function(context, frameState, opt_transform) {
this.dispatchComposeEvent_(ol.render.EventType.PRECOMPOSE, context,
frameState, opt_transform);
};
/**
* @param {CanvasRenderingContext2D} context Context.
* @param {olx.FrameState} frameState Frame state.
* @param {ol.Transform=} opt_transform Transform.
* @protected
*/
ol.renderer.canvas.Layer.prototype.dispatchRenderEvent = function(context, frameState, opt_transform) {
this.dispatchComposeEvent_(ol.render.EventType.RENDER, context,
frameState, opt_transform);
};
/**
* @param {olx.FrameState} frameState Frame state.
* @param {number} offsetX Offset on the x-axis in view coordinates.
* @protected
* @return {!ol.Transform} Transform.
*/
ol.renderer.canvas.Layer.prototype.getTransform = function(frameState, offsetX) {
var viewState = frameState.viewState;
var pixelRatio = frameState.pixelRatio;
var dx1 = pixelRatio * frameState.size[0] / 2;
var dy1 = pixelRatio * frameState.size[1] / 2;
var sx = pixelRatio / viewState.resolution;
var sy = -sx;
var angle = -viewState.rotation;
var dx2 = -viewState.center[0] + offsetX;
var dy2 = -viewState.center[1];
return ol.transform.compose(this.transform_, dx1, dy1, sx, sy, angle, dx2, dy2);
};
/**
* @abstract
* @param {olx.FrameState} frameState Frame state.
* @param {ol.LayerState} layerState Layer state.
* @param {CanvasRenderingContext2D} context Context.
*/
ol.renderer.canvas.Layer.prototype.composeFrame = function(frameState, layerState, context) {};
/**
* @abstract
* @param {olx.FrameState} frameState Frame state.
* @param {ol.LayerState} layerState Layer state.
* @return {boolean} whether composeFrame should be called.
*/
ol.renderer.canvas.Layer.prototype.prepareFrame = function(frameState, layerState) {};
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