1 files changed, 526 insertions, 0 deletions
diff --git a/web/arrow.js b/web/arrow.js
new file mode 100644
index 0000000..5c09e2c
--- /dev/null
+++ b/web/arrow.js
@@ -0,0 +1,526 @@
+goog.provide('ol.style.Arrow');
+
+goog.require('ol');
+goog.require('ol.color');
+goog.require('ol.dom');
+goog.require('ol.has');
+goog.require('ol.render.canvas');
+goog.require('ol.style.Image');
+goog.require('ol.style.ImageState');
+
+
+
+/**
+ * @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.DEBUG && console.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.DEBUG && console.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];
+};