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+goog.provide('ol.style.Arrow');
+
+goog.require('goog.asserts');
+goog.require('ol');
+goog.require('ol.color');
+goog.require('ol.dom');
+goog.require('ol.has');
+goog.require('ol.render.canvas');
+goog.require('ol.style.AtlasManager');
+goog.require('ol.style.Fill');
+goog.require('ol.style.Image');
+goog.require('ol.style.ImageState');
+goog.require('ol.style.Stroke');
+
+
+
+/**
+ * @classdesc
+ * Set arrow style for vector features.
+ *
+ * @constructor
+ * @param {olx.style.ArrowOptions} options Options.
+ * @extends {ol.style.Image}
+ * @api
+ */
+ol.style.Arrow = function(options) {
+
+ goog.asserts.assert(options.radius !== undefined,
+ 'must provide "radius"');
+
+ /**
+ * @private
+ * @type {Array.<string>}
+ */
+ this.checksums_ = null;
+
+ /**
+ * @private
+ * @type {HTMLCanvasElement}
+ */
+ this.canvas_ = null;
+
+ /**
+ * @private
+ * @type {HTMLCanvasElement}
+ */
+ this.hitDetectionCanvas_ = null;
+
+ /**
+ * @private
+ * @type {ol.style.Fill}
+ */
+ this.fill_ = options.fill !== undefined ? options.fill : null;
+
+ /**
+ * @private
+ * @type {Array.<number>}
+ */
+ this.origin_ = [0, 0];
+
+ /**
+ * @private
+ * @type {number}
+ */
+ this.radius_ = /** @type {number} */ (options.radius !== undefined ?
+ options.radius : options.radius1);
+
+ /**
+ * @private
+ * @type {number}
+ */
+ this.frontAngle_ = options.frontAngle !== undefined ?
+ options.frontAngle : Math.PI / 5;
+
+ /**
+ * @private
+ * @type {number}
+ */
+ this.backAngle_ = options.backAngle !== undefined ?
+ options.backAngle : 4 * Math.PI / 5;
+
+ /**
+ * @private
+ * @type {ol.style.Stroke}
+ */
+ this.stroke_ = options.stroke !== undefined ? options.stroke : null;
+
+ /**
+ * @private
+ * @type {Array.<number>}
+ */
+ this.anchor_ = null;
+
+ /**
+ * @private
+ * @type {ol.Size}
+ */
+ this.size_ = null;
+
+ /**
+ * @private
+ * @type {ol.Size}
+ */
+ this.imageSize_ = null;
+
+ /**
+ * @private
+ * @type {ol.Size}
+ */
+ this.hitDetectionImageSize_ = null;
+
+ this.render_(options.atlasManager);
+
+ /**
+ * @type {boolean}
+ */
+ var snapToPixel = options.snapToPixel !== undefined ?
+ options.snapToPixel : true;
+
+ /**
+ * @type {boolean}
+ */
+ var rotateWithView = options.rotateWithView !== undefined ?
+ options.rotateWithView : false;
+
+ ol.style.Image.call(this, {
+ opacity: 1,
+ rotateWithView: rotateWithView,
+ rotation: options.rotation !== undefined ? options.rotation : 0,
+ scale: 1,
+ snapToPixel: snapToPixel
+ });
+
+};
+ol.inherits(ol.style.Arrow, ol.style.Image);
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.style.Arrow.prototype.getAnchor = function() {
+ return this.anchor_;
+};
+
+
+/**
+ * Get front angle of the arrow.
+ * @return {number} Angle in radians.
+ * @api
+ */
+ol.style.Arrow.prototype.getFrontAngle = function() {
+ return this.frontAngle_;
+};
+
+
+/**
+ * Get back angle of the arrow.
+ * @return {number} Angle in radians.
+ * @api
+ */
+ol.style.Arrow.prototype.getBackAngle = function() {
+ return this.backAngle_;
+};
+
+
+/**
+ * Get the fill style for the arrow.
+ * @return {ol.style.Fill} Fill style.
+ * @api
+ */
+ol.style.Arrow.prototype.getFill = function() {
+ return this.fill_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Arrow.prototype.getHitDetectionImage = function(pixelRatio) {
+ return this.hitDetectionCanvas_;
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.style.Arrow.prototype.getImage = function(pixelRatio) {
+ return this.canvas_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Arrow.prototype.getImageSize = function() {
+ return this.imageSize_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Arrow.prototype.getHitDetectionImageSize = function() {
+ return this.hitDetectionImageSize_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Arrow.prototype.getImageState = function() {
+ return ol.style.ImageState.LOADED;
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.style.Arrow.prototype.getOrigin = function() {
+ return this.origin_;
+};
+
+
+/**
+ * Get the (primary) radius for the arrow.
+ * @return {number} Radius.
+ * @api
+ */
+ol.style.Arrow.prototype.getRadius = function() {
+ return this.radius_;
+};
+
+
+/**
+ * @inheritDoc
+ * @api
+ */
+ol.style.Arrow.prototype.getSize = function() {
+ return this.size_;
+};
+
+
+/**
+ * Get the stroke style for the arrow.
+ * @return {ol.style.Stroke} Stroke style.
+ * @api
+ */
+ol.style.Arrow.prototype.getStroke = function() {
+ return this.stroke_;
+};
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Arrow.prototype.listenImageChange = ol.nullFunction;
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Arrow.prototype.load = ol.nullFunction;
+
+
+/**
+ * @inheritDoc
+ */
+ol.style.Arrow.prototype.unlistenImageChange = ol.nullFunction;
+
+
+/**
+ * @typedef {{
+ * strokeStyle: (string|undefined),
+ * strokeWidth: number,
+ * size: number,
+ * lineCap: string,
+ * lineDash: Array.<number>,
+ * lineJoin: string,
+ * miterLimit: number
+ * }}
+ */
+ol.ArrowRenderOptions;
+
+
+/**
+ * @private
+ * @param {ol.style.AtlasManager|undefined} atlasManager An atlas manager.
+ */
+ol.style.Arrow.prototype.render_ = function(atlasManager) {
+ var imageSize;
+ var lineCap = '';
+ var lineJoin = '';
+ var miterLimit = 0;
+ var lineDash = null;
+ var strokeStyle;
+ var strokeWidth = 0;
+
+ if (this.stroke_) {
+ strokeStyle = ol.color.asString(this.stroke_.getColor());
+ strokeWidth = this.stroke_.getWidth();
+ if (strokeWidth === undefined) {
+ strokeWidth = ol.render.canvas.defaultLineWidth;
+ }
+ lineDash = this.stroke_.getLineDash();
+ if (!ol.has.CANVAS_LINE_DASH) {
+ lineDash = null;
+ }
+ lineJoin = this.stroke_.getLineJoin();
+ if (lineJoin === undefined) {
+ lineJoin = ol.render.canvas.defaultLineJoin;
+ }
+ lineCap = this.stroke_.getLineCap();
+ if (lineCap === undefined) {
+ lineCap = ol.render.canvas.defaultLineCap;
+ }
+ miterLimit = this.stroke_.getMiterLimit();
+ if (miterLimit === undefined) {
+ miterLimit = ol.render.canvas.defaultMiterLimit;
+ }
+ }
+
+ var size = 2 * (this.radius_ + strokeWidth) + 1;
+
+ /** @type {ol.ArrowRenderOptions} */
+ var renderOptions = {
+ strokeStyle: strokeStyle,
+ strokeWidth: strokeWidth,
+ size: size,
+ lineCap: lineCap,
+ lineDash: lineDash,
+ lineJoin: lineJoin,
+ miterLimit: miterLimit
+ };
+
+ if (atlasManager === undefined) {
+ // no atlas manager is used, create a new canvas
+ var context = ol.dom.createCanvasContext2D(size, size);
+ this.canvas_ = context.canvas;
+
+ // canvas.width and height are rounded to the closest integer
+ size = this.canvas_.width;
+ imageSize = size;
+
+ this.draw_(renderOptions, context, 0, 0);
+
+ this.createHitDetectionCanvas_(renderOptions);
+ } else {
+ // an atlas manager is used, add the symbol to an atlas
+ size = Math.round(size);
+
+ var hasCustomHitDetectionImage = !this.fill_;
+ var renderHitDetectionCallback;
+ if (hasCustomHitDetectionImage) {
+ // render the hit-detection image into a separate atlas image
+ renderHitDetectionCallback =
+ this.drawHitDetectionCanvas_.bind(this, renderOptions);
+ }
+
+ var id = this.getChecksum();
+ var info = atlasManager.add(
+ id, size, size, this.draw_.bind(this, renderOptions),
+ renderHitDetectionCallback);
+ goog.asserts.assert(info, 'arrow size is too large');
+
+ this.canvas_ = info.image;
+ this.origin_ = [info.offsetX, info.offsetY];
+ imageSize = info.image.width;
+
+ if (hasCustomHitDetectionImage) {
+ this.hitDetectionCanvas_ = info.hitImage;
+ this.hitDetectionImageSize_ =
+ [info.hitImage.width, info.hitImage.height];
+ } else {
+ this.hitDetectionCanvas_ = this.canvas_;
+ this.hitDetectionImageSize_ = [imageSize, imageSize];
+ }
+ }
+
+ this.anchor_ = [size / 2, size / 2];
+ this.size_ = [size, size];
+ this.imageSize_ = [imageSize, imageSize];
+};
+
+
+/**
+ * @private
+ * @param {ol.ArrowRenderOptions} renderOptions Render options.
+ * @param {CanvasRenderingContext2D} context The rendering context.
+ * @param {number} x The origin for the symbol (x).
+ * @param {number} y The origin for the symbol (y).
+ */
+ol.style.Arrow.prototype.draw_ = function(renderOptions, context, x, y) {
+ var innerRadius = this.radius_ / Math.sin(Math.PI - this.backAngle_ / 2) *
+ Math.sin(this.backAngle_ / 2 - this.frontAngle_);
+
+ // reset transform
+ context.setTransform(1, 0, 0, 1, 0, 0);
+
+ // then move to (x, y)
+ context.translate(x, y);
+
+
+ context.beginPath();
+
+ function lineTo(radius, angle) {
+ context.lineTo(
+ renderOptions.size / 2 + radius * Math.cos(angle + Math.PI / 2),
+ renderOptions.size / 2 - radius * Math.sin(angle + Math.PI / 2));
+ }
+
+ lineTo(this.radius_, 0);
+ lineTo(this.radius_, Math.PI - this.frontAngle_);
+ lineTo(innerRadius, Math.PI);
+ lineTo(this.radius_, this.frontAngle_ - Math.PI);
+ lineTo(this.radius_, 0);
+
+ if (this.fill_) {
+ context.fillStyle = ol.colorlike.asColorLike(this.fill_.getColor());
+ context.fill();
+ }
+ if (this.stroke_) {
+ context.strokeStyle = renderOptions.strokeStyle;
+ context.lineWidth = renderOptions.strokeWidth;
+ if (renderOptions.lineDash) {
+ context.setLineDash(renderOptions.lineDash);
+ }
+ context.lineCap = renderOptions.lineCap;
+ context.lineJoin = renderOptions.lineJoin;
+ context.miterLimit = renderOptions.miterLimit;
+ context.stroke();
+ }
+ context.closePath();
+};
+
+
+/**
+ * @private
+ * @param {ol.ArrowRenderOptions} renderOptions Render options.
+ */
+ol.style.Arrow.prototype.createHitDetectionCanvas_ = function(renderOptions) {
+ this.hitDetectionImageSize_ = [renderOptions.size, renderOptions.size];
+ if (this.fill_) {
+ this.hitDetectionCanvas_ = this.canvas_;
+ return;
+ }
+
+ // if no fill style is set, create an extra hit-detection image with a
+ // default fill style
+ var context = ol.dom.createCanvasContext2D(renderOptions.size, renderOptions.size);
+ this.hitDetectionCanvas_ = context.canvas;
+
+ this.drawHitDetectionCanvas_(renderOptions, context, 0, 0);
+};
+
+
+/**
+ * @private
+ * @param {ol.ArrowRenderOptions} renderOptions Render options.
+ * @param {CanvasRenderingContext2D} context The context.
+ * @param {number} x The origin for the symbol (x).
+ * @param {number} y The origin for the symbol (y).
+ */
+ol.style.Arrow.prototype.drawHitDetectionCanvas_ = function(renderOptions, context, x, y) {
+ var innerRadius = this.radius_ / Math.sin(Math.PI - this.backAngle_ / 2) *
+ Math.sin(this.backAngle_ / 2 - this.frontAngle_);
+
+ // reset transform
+ context.setTransform(1, 0, 0, 1, 0, 0);
+
+ // then move to (x, y)
+ context.translate(x, y);
+
+ context.beginPath();
+
+ function lineTo(radius, angle) {
+ context.lineTo(
+ renderOptions.size / 2 + radius * Math.cos(angle + Math.PI / 2),
+ renderOptions.size / 2 - radius * Math.sin(angle + Math.PI / 2));
+ }
+
+ lineTo(this.radius_, 0);
+ lineTo(this.radius_, Math.PI - this.frontAngle_);
+ lineTo(innerRadius / 2, Math.PI);
+ lineTo(this.radius_, this.frontAngle_ - Math.PI);
+ lineTo(this.radius_, 0);
+
+ context.fillStyle = ol.render.canvas.defaultFillStyle;
+ context.fill();
+ if (this.stroke_) {
+ context.strokeStyle = renderOptions.strokeStyle;
+ context.lineWidth = renderOptions.strokeWidth;
+ if (renderOptions.lineDash) {
+ context.setLineDash(renderOptions.lineDash);
+ }
+ context.stroke();
+ }
+ context.closePath();
+};
+
+
+/**
+ * @return {string} The checksum.
+ */
+ol.style.Arrow.prototype.getChecksum = function() {
+ var strokeChecksum = this.stroke_ ?
+ this.stroke_.getChecksum() : '-';
+ var fillChecksum = this.fill_ ?
+ this.fill_.getChecksum() : '-';
+
+ var recalculate = !this.checksums_ ||
+ (strokeChecksum != this.checksums_[1] ||
+ fillChecksum != this.checksums_[2] ||
+ this.radius_ != this.checksums_[3] ||
+ this.frontAngle_ != this.checksums_[4] ||
+ this.backAngle_ != this.checksums_[5]);
+
+ if (recalculate) {
+ var checksum = 'r' + strokeChecksum + fillChecksum +
+ (this.radius_ !== undefined ? this.radius_.toString() : '-') +
+ (this.frontAngle_ !== undefined ? this.frontAngle_.toString() : '-') +
+ (this.backAngle_ !== undefined ? this.backAngle_.toString() : '-');
+ this.checksums_ = [checksum, strokeChecksum, fillChecksum,
+ this.radius_, this.frontAngle_, this.backAngle_];
+ }
+
+ return this.checksums_[0];
+};