efc86d59b0
This commit also changes the TextReplay.drawText() signature, and moves geometry calculation into drawText(). This improves performance where no text needs to be rendered (TextStyle.getText() == ''), which is used often in applications.
464 lines
13 KiB
JavaScript
464 lines
13 KiB
JavaScript
goog.provide('ol.render.webgl.TextReplay');
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goog.require('ol');
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goog.require('ol.colorlike');
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goog.require('ol.dom');
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goog.require('ol.geom.GeometryType');
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goog.require('ol.has');
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goog.require('ol.render.replay');
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goog.require('ol.render.webgl');
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goog.require('ol.render.webgl.TextureReplay');
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goog.require('ol.style.AtlasManager');
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goog.require('ol.webgl.Buffer');
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/**
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* @constructor
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* @extends {ol.render.webgl.TextureReplay}
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* @param {number} tolerance Tolerance.
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* @param {ol.Extent} maxExtent Max extent.
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* @struct
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*/
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ol.render.webgl.TextReplay = function(tolerance, maxExtent) {
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ol.render.webgl.TextureReplay.call(this, tolerance, maxExtent);
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/**
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* @private
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* @type {Array.<HTMLCanvasElement>}
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*/
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this.images_ = [];
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/**
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* @private
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* @type {Array.<WebGLTexture>}
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*/
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this.textures_ = [];
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/**
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* @private
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* @type {HTMLCanvasElement}
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*/
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this.measureCanvas_ = ol.dom.createCanvasContext2D(0, 0).canvas;
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/**
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* @private
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* @type {{strokeColor: (ol.ColorLike|null),
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* lineCap: (string|undefined),
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* lineDash: Array.<number>,
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* lineDashOffset: (number|undefined),
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* lineJoin: (string|undefined),
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* lineWidth: number,
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* miterLimit: (number|undefined),
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* fillColor: (ol.ColorLike|null),
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* font: (string|undefined),
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* scale: (number|undefined)}}
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*/
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this.state_ = {
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strokeColor: null,
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lineCap: undefined,
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lineDash: null,
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lineDashOffset: undefined,
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lineJoin: undefined,
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lineWidth: 0,
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miterLimit: undefined,
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fillColor: null,
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font: undefined,
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scale: undefined
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};
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/**
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* @private
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* @type {string}
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*/
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this.text_ = '';
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/**
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* @private
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* @type {number|undefined}
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*/
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this.textAlign_ = undefined;
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/**
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* @private
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* @type {number|undefined}
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*/
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this.textBaseline_ = undefined;
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/**
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* @private
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* @type {number|undefined}
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*/
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this.offsetX_ = undefined;
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/**
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* @private
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* @type {number|undefined}
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*/
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this.offsetY_ = undefined;
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/**
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* @private
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* @type {Object.<string, ol.WebglGlyphAtlas>}
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*/
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this.atlases_ = {};
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/**
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* @private
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* @type {ol.WebglGlyphAtlas|undefined}
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*/
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this.currAtlas_ = undefined;
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this.scale = 1;
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this.opacity = 1;
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};
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ol.inherits(ol.render.webgl.TextReplay, ol.render.webgl.TextureReplay);
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/**
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* @inheritDoc
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*/
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ol.render.webgl.TextReplay.prototype.drawText = function(geometry, feature) {
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if (this.text_) {
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var flatCoordinates = null;
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var offset = 0;
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var end = 2;
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var stride = 2;
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switch (geometry.getType()) {
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case ol.geom.GeometryType.POINT:
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case ol.geom.GeometryType.MULTI_POINT:
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flatCoordinates = geometry.getFlatCoordinates();
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end = flatCoordinates.length;
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stride = geometry.getStride();
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break;
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case ol.geom.GeometryType.CIRCLE:
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flatCoordinates = /** @type {ol.geom.Circle} */ (geometry).getCenter();
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break;
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case ol.geom.GeometryType.LINE_STRING:
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flatCoordinates = /** @type {ol.geom.LineString} */ (geometry).getFlatMidpoint();
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break;
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case ol.geom.GeometryType.MULTI_LINE_STRING:
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flatCoordinates = /** @type {ol.geom.MultiLineString} */ (geometry).getFlatMidpoints();
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end = flatCoordinates.length;
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break;
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case ol.geom.GeometryType.POLYGON:
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flatCoordinates = /** @type {ol.geom.Polygon} */ (geometry).getFlatInteriorPoint();
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break;
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case ol.geom.GeometryType.MULTI_POLYGON:
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flatCoordinates = /** @type {ol.geom.MultiPolygon} */ (geometry).getFlatInteriorPoints();
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end = flatCoordinates.length;
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break;
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default:
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}
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this.startIndices.push(this.indices.length);
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this.startIndicesFeature.push(feature);
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var glyphAtlas = this.currAtlas_;
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var lines = this.text_.split('\n');
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var textSize = this.getTextSize_(lines);
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var i, ii, j, jj, currX, currY, charArr, charInfo;
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var anchorX = Math.round(textSize[0] * this.textAlign_ - this.offsetX_);
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var anchorY = Math.round(textSize[1] * this.textBaseline_ - this.offsetY_);
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var lineWidth = (this.state_.lineWidth / 2) * this.state_.scale;
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for (i = 0, ii = lines.length; i < ii; ++i) {
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currX = 0;
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currY = glyphAtlas.height * i;
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charArr = lines[i].split('');
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for (j = 0, jj = charArr.length; j < jj; ++j) {
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charInfo = glyphAtlas.atlas.getInfo(charArr[j]);
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if (charInfo) {
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var image = charInfo.image;
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this.anchorX = anchorX - currX;
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this.anchorY = anchorY - currY;
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this.originX = j === 0 ? charInfo.offsetX - lineWidth : charInfo.offsetX;
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this.originY = charInfo.offsetY;
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this.height = glyphAtlas.height;
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this.width = j === 0 || j === charArr.length - 1 ?
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glyphAtlas.width[charArr[j]] + lineWidth : glyphAtlas.width[charArr[j]];
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this.imageHeight = image.height;
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this.imageWidth = image.width;
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var currentImage;
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if (this.images_.length === 0) {
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this.images_.push(image);
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} else {
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currentImage = this.images_[this.images_.length - 1];
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if (ol.getUid(currentImage) != ol.getUid(image)) {
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this.groupIndices.push(this.indices.length);
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this.images_.push(image);
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}
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}
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this.drawText_(flatCoordinates, offset, end, stride);
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}
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currX += this.width;
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}
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}
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}
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};
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/**
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* @private
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* @param {Array.<string>} lines Label to draw split to lines.
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* @return {Array.<number>} Size of the label in pixels.
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*/
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ol.render.webgl.TextReplay.prototype.getTextSize_ = function(lines) {
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var self = this;
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var glyphAtlas = this.currAtlas_;
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var textHeight = lines.length * glyphAtlas.height;
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//Split every line to an array of chars, sum up their width, and select the longest.
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var textWidth = lines.map(function(str) {
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var sum = 0;
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var i, ii;
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for (i = 0, ii = str.length; i < ii; ++i) {
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var curr = str[i];
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if (!glyphAtlas.width[curr]) {
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self.addCharToAtlas_(curr);
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}
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sum += glyphAtlas.width[curr] ? glyphAtlas.width[curr] : 0;
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}
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return sum;
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}).reduce(function(max, curr) {
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return Math.max(max, curr);
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});
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return [textWidth, textHeight];
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};
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/**
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* @private
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* @param {Array.<number>} flatCoordinates Flat coordinates.
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* @param {number} offset Offset.
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* @param {number} end End.
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* @param {number} stride Stride.
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*/
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ol.render.webgl.TextReplay.prototype.drawText_ = function(flatCoordinates, offset,
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end, stride) {
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var i, ii;
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for (i = offset, ii = end; i < ii; i += stride) {
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this.drawCoordinates(flatCoordinates, offset, end, stride);
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}
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};
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/**
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* @private
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* @param {string} char Character.
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*/
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ol.render.webgl.TextReplay.prototype.addCharToAtlas_ = function(char) {
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if (char.length === 1) {
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var glyphAtlas = this.currAtlas_;
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var state = this.state_;
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var mCtx = this.measureCanvas_.getContext('2d');
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mCtx.font = state.font;
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var width = Math.ceil(mCtx.measureText(char).width * state.scale);
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var info = glyphAtlas.atlas.add(char, width, glyphAtlas.height,
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function(ctx, x, y) {
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//Parameterize the canvas
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ctx.font = /** @type {string} */ (state.font);
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ctx.fillStyle = state.fillColor;
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ctx.strokeStyle = state.strokeColor;
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ctx.lineWidth = state.lineWidth;
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ctx.lineCap = /*** @type {string} */ (state.lineCap);
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ctx.lineJoin = /** @type {string} */ (state.lineJoin);
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ctx.miterLimit = /** @type {number} */ (state.miterLimit);
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ctx.textAlign = 'left';
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ctx.textBaseline = 'top';
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if (ol.has.CANVAS_LINE_DASH && state.lineDash) {
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//FIXME: use pixelRatio
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ctx.setLineDash(state.lineDash);
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ctx.lineDashOffset = /** @type {number} */ (state.lineDashOffset);
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}
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if (state.scale !== 1) {
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//FIXME: use pixelRatio
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ctx.setTransform(/** @type {number} */ (state.scale), 0, 0,
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/** @type {number} */ (state.scale), 0, 0);
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}
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//Draw the character on the canvas
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if (state.strokeColor) {
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ctx.strokeText(char, x, y);
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}
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if (state.fillColor) {
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ctx.fillText(char, x, y);
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}
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});
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if (info) {
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glyphAtlas.width[char] = width;
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}
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}
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};
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/**
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* @inheritDoc
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*/
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ol.render.webgl.TextReplay.prototype.finish = function(context) {
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var gl = context.getGL();
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this.groupIndices.push(this.indices.length);
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this.hitDetectionGroupIndices = this.groupIndices;
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// create, bind, and populate the vertices buffer
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this.verticesBuffer = new ol.webgl.Buffer(this.vertices);
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// create, bind, and populate the indices buffer
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this.indicesBuffer = new ol.webgl.Buffer(this.indices);
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// create textures
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/** @type {Object.<string, WebGLTexture>} */
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var texturePerImage = {};
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this.createTextures(this.textures_, this.images_, texturePerImage, gl);
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this.state_ = {
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strokeColor: null,
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lineCap: undefined,
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lineDash: null,
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lineDashOffset: undefined,
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lineJoin: undefined,
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lineWidth: 0,
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miterLimit: undefined,
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fillColor: null,
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font: undefined,
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scale: undefined
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};
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this.text_ = '';
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this.textAlign_ = undefined;
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this.textBaseline_ = undefined;
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this.offsetX_ = undefined;
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this.offsetY_ = undefined;
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this.images_ = null;
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this.atlases_ = {};
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this.currAtlas_ = undefined;
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ol.render.webgl.TextureReplay.prototype.finish.call(this, context);
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};
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/**
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* @inheritDoc
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*/
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ol.render.webgl.TextReplay.prototype.setTextStyle = function(textStyle) {
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var state = this.state_;
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var textFillStyle = textStyle.getFill();
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var textStrokeStyle = textStyle.getStroke();
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if (!textStyle || !textStyle.getText() || (!textFillStyle && !textStrokeStyle)) {
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this.text_ = '';
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} else {
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if (!textFillStyle) {
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state.fillColor = null;
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} else {
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var textFillStyleColor = textFillStyle.getColor();
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state.fillColor = ol.colorlike.asColorLike(textFillStyleColor ?
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textFillStyleColor : ol.render.webgl.defaultFillStyle);
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}
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if (!textStrokeStyle) {
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state.strokeColor = null;
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state.lineWidth = 0;
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} else {
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var textStrokeStyleColor = textStrokeStyle.getColor();
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state.strokeColor = ol.colorlike.asColorLike(textStrokeStyleColor ?
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textStrokeStyleColor : ol.render.webgl.defaultStrokeStyle);
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state.lineWidth = textStrokeStyle.getWidth() || ol.render.webgl.defaultLineWidth;
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state.lineCap = textStrokeStyle.getLineCap() || ol.render.webgl.defaultLineCap;
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state.lineDashOffset = textStrokeStyle.getLineDashOffset() || ol.render.webgl.defaultLineDashOffset;
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state.lineJoin = textStrokeStyle.getLineJoin() || ol.render.webgl.defaultLineJoin;
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state.miterLimit = textStrokeStyle.getMiterLimit() || ol.render.webgl.defaultMiterLimit;
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var lineDash = textStrokeStyle.getLineDash();
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state.lineDash = lineDash ? lineDash.slice() : ol.render.webgl.defaultLineDash;
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}
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state.font = textStyle.getFont() || ol.render.webgl.defaultFont;
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state.scale = textStyle.getScale() || 1;
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this.text_ = /** @type {string} */ (textStyle.getText());
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var textAlign = ol.render.replay.TEXT_ALIGN[textStyle.getTextAlign()];
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var textBaseline = ol.render.replay.TEXT_ALIGN[textStyle.getTextBaseline()];
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this.textAlign_ = textAlign === undefined ?
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ol.render.webgl.defaultTextAlign : textAlign;
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this.textBaseline_ = textBaseline === undefined ?
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ol.render.webgl.defaultTextBaseline : textBaseline;
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this.offsetX_ = textStyle.getOffsetX() || 0;
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this.offsetY_ = textStyle.getOffsetY() || 0;
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this.rotateWithView = !!textStyle.getRotateWithView();
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this.rotation = textStyle.getRotation() || 0;
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this.currAtlas_ = this.getAtlas_(state);
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}
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};
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/**
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* @private
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* @param {Object} state Font attributes.
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* @return {ol.WebglGlyphAtlas} Glyph atlas.
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*/
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ol.render.webgl.TextReplay.prototype.getAtlas_ = function(state) {
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var params = [];
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var i;
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for (i in state) {
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if (state[i] || state[i] === 0) {
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if (Array.isArray(state[i])) {
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params = params.concat(state[i]);
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} else {
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params.push(state[i]);
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}
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}
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}
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var hash = this.calculateHash_(params);
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if (!this.atlases_[hash]) {
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var mCtx = this.measureCanvas_.getContext('2d');
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mCtx.font = state.font;
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var height = Math.ceil((mCtx.measureText('M').width * 1.5 +
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state.lineWidth / 2) * state.scale);
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this.atlases_[hash] = {
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atlas: new ol.style.AtlasManager({
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space: state.lineWidth + 1
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}),
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width: {},
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height: height
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};
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}
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return this.atlases_[hash];
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};
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/**
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* @private
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* @param {Array.<string|number>} params Array of parameters.
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* @return {string} Hash string.
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*/
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ol.render.webgl.TextReplay.prototype.calculateHash_ = function(params) {
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//TODO: Create a more performant, reliable, general hash function.
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var i, ii;
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var hash = '';
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for (i = 0, ii = params.length; i < ii; ++i) {
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hash += params[i];
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}
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return hash;
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};
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/**
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* @inheritDoc
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*/
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ol.render.webgl.TextReplay.prototype.getTextures = function(opt_all) {
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return this.textures_;
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};
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/**
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* @inheritDoc
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*/
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ol.render.webgl.TextReplay.prototype.getHitDetectionTextures = function() {
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return this.textures_;
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};
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