Implemented selection for showText()
This commit is contained in:
Artur Adib
parent
46a48a56b7
commit
9ebec03ddc
153
src/canvas.js
153
src/canvas.js
@ -453,7 +453,58 @@ var CanvasGraphics = (function canvasGraphics() {
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nextLine: function canvasGraphicsNextLine() {
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this.moveText(0, this.current.leading);
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},
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showText: function canvasGraphicsShowText(text) {
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applyTextTransforms: function canvasApplyTransforms() {
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var ctx = this.ctx;
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var current = this.current;
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var textHScale = current.textHScale;
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var font = current.font;
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ctx.transform.apply(ctx, current.textMatrix);
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ctx.scale(1, -1);
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ctx.translate(current.x, -1 * current.y);
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ctx.transform.apply(ctx, font.fontMatrix || IDENTITY_MATRIX);
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ctx.scale(1 / textHScale, 1);
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},
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getTextGeometry: function canvasGetTextGeometry() {
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var geom = {};
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var ctx = this.ctx;
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var font = this.current.font;
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var ctxMatrix = ctx.mozCurrentTransform;
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if (ctxMatrix) {
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var bl = Util.applyTransform([0, 0], ctxMatrix);
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var tr = Util.applyTransform([1, 1], ctxMatrix);
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geom.x = bl[0];
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geom.y = bl[1];
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geom.hScale = tr[0] - bl[0];
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geom.vScale = tr[1] - bl[1];
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}
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var spaceGlyph = font.charsToGlyphs(' ', true);
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// Hack (sometimes space is not encoded)
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if (spaceGlyph.length === 0 || spaceGlyph[0].width === 0)
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spaceGlyph = font.charsToGlyphs('i', true);
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// Fallback
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if (spaceGlyph.length === 0 || spaceGlyph[0].width === 0)
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spaceGlyph = [ {width:0} ];
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geom.spaceWidth = spaceGlyph[0].width;
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return geom;
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},
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pushTextDivs: function canvasGraphicsPushTextDivs(text) {
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var div = document.createElement('div');
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var fontSize = this.current.fontSize;
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var fontHeight = text.geom.vScale * fontSize;
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div.style.fontSize = fontHeight + 'px';
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// TODO: family should be '= font.loadedName', but some fonts don't
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// have spacing info (cf. fonts.js > Font > fields > htmx)
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div.style.fontFamily = 'serif';
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div.style.left = text.geom.x + 'px';
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div.style.top = (text.geom.y - fontHeight) + 'px';
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div.innerHTML = text.str;
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div.dataset.canvasWidth = text.canvasWidth * text.geom.hScale;
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div.dataset.textLength = text.length;
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this.textDivs.push(div);
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},
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showText: function canvasGraphicsShowText(str, skipTextSelection) {
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function unicodeToChar(unicode) {
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return (unicode >= 0x10000) ?
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String.fromCharCode(0xD800 | ((unicode - 0x10000) >> 10),
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@ -463,14 +514,24 @@ var CanvasGraphics = (function canvasGraphics() {
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var ctx = this.ctx;
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var current = this.current;
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var font = current.font;
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var glyphs = font.charsToGlyphs(text);
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var glyphs = font.charsToGlyphs(str);
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var fontSize = current.fontSize;
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var charSpacing = current.charSpacing;
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var wordSpacing = current.wordSpacing;
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var textHScale = current.textHScale;
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var glyphsLength = glyphs.length;
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var text = { chars:'', width:0 };
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var textLayer = this.textLayer;
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var text = { str:'', length:0, canvasWidth:0, geom:{}};
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var textSelection = textLayer && !skipTextSelection ? true : false;
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if (textSelection) {
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ctx.save();
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this.applyTextTransforms();
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text.geom = this.getTextGeometry();
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ctx.restore();
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}
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// Type3 fonts - each glyph is a "mini-PDF"
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if (font.coded) {
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ctx.save();
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ctx.transform.apply(ctx, current.textMatrix);
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@ -498,17 +559,14 @@ var CanvasGraphics = (function canvasGraphics() {
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ctx.translate(charWidth, 0);
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current.x += charWidth;
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text.chars += unicodeToChar(glyph.unicode);
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text.width += charWidth;
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text.str += unicodeToChar(glyph.unicode);
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text.canvasWidth += charWidth;
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text.length++;
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}
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ctx.restore();
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} else {
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ctx.save();
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ctx.transform.apply(ctx, current.textMatrix);
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ctx.scale(1, -1);
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ctx.translate(current.x, -1 * current.y);
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ctx.transform.apply(ctx, font.fontMatrix || IDENTITY_MATRIX);
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ctx.scale(1 / textHScale, 1);
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this.applyTextTransforms();
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var width = 0;
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for (var i = 0; i < glyphsLength; ++i) {
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@ -524,12 +582,18 @@ var CanvasGraphics = (function canvasGraphics() {
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ctx.fillText(char, width, 0);
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width += charWidth;
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text.chars += char;
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text.width += charWidth;
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text.str += char;
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text.canvasWidth += charWidth;
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text.length++;
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}
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current.x += width;
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ctx.restore();
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}
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if (textSelection)
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this.pushTextDivs(text);
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return text;
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},
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showSpacedText: function canvasGraphicsShowSpacedText(arr) {
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@ -540,32 +604,13 @@ var CanvasGraphics = (function canvasGraphics() {
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var arrLength = arr.length;
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var textLayer = this.textLayer;
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var font = current.font;
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var text = {str:'', length:0, canvasWidth:0, spaceWidth:0, geom:{}};
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var text = {str:'', length:0, canvasWidth:0, geom:{}};
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var textSelection = textLayer ? true : false;
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if (textLayer) {
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text.spaceWidth = this.current.font.charsToGlyphs(' ')[0].width;
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if (!text.spaceWidth>0) {
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// Hack (space is sometimes not encoded)
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text.spaceWidth = this.current.font.charsToGlyphs('i')[0].width;
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}
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// Compute text.geom
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// TODO: refactor the series of transformations below, and share it with showText()
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if (textSelection) {
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ctx.save();
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ctx.transform.apply(ctx, current.textMatrix);
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ctx.scale(1, -1);
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ctx.translate(current.x, -1 * current.y);
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ctx.transform.apply(ctx, font.fontMatrix || IDENTITY_MATRIX);
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ctx.scale(1 / textHScale, 1);
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var ctxMatrix = ctx.mozCurrentTransform;
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if (ctxMatrix) {
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var bl = Util.applyTransform([0, 0], ctxMatrix);
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var tr = Util.applyTransform([1, 1], ctxMatrix);
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text.geom.x = bl[0];
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text.geom.y = bl[1];
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text.geom.xFactor = tr[0] - bl[0];
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text.geom.yFactor = tr[1] - bl[1];
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}
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this.applyTextTransforms();
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text.geom = this.getTextGeometry();
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ctx.restore();
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}
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@ -575,47 +620,35 @@ var CanvasGraphics = (function canvasGraphics() {
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var spacingLength = -e * 0.001 * fontSize * textHScale;
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current.x += spacingLength;
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if (textLayer) {
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if (textSelection) {
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// Emulate precise spacing via HTML spaces
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text.canvasWidth += spacingLength;
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if (e<0 && text.spaceWidth>0) { // avoid div by zero
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var numFakeSpaces = Math.round(-e / text.spaceWidth);
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if (e<0 && text.geom.spaceWidth>0) { // avoid div by zero
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var numFakeSpaces = Math.round(-e / text.geom.spaceWidth);
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for (var j = 0; j < numFakeSpaces; ++j)
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text.str += ' ';
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text.length += numFakeSpaces>0 ? 1 : 0;
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}
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}
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} else if (isString(e)) {
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var shownText = this.showText(e);
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var shownText = this.showText(e, true);
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if (textLayer) {
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if (shownText.chars === ' ') {
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text.str += ' ';
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if (textSelection) {
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if (shownText.str === ' ') {
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text.str += ' ';
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} else {
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text.str += shownText.chars;
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text.str += shownText.str;
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}
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text.canvasWidth += shownText.width;
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text.canvasWidth += shownText.canvasWidth;
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text.length += e.length;
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}
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} else {
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malformed('TJ array element ' + e + ' is not string or num');
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}
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}
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if (textLayer) {
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var div = document.createElement('div');
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var fontHeight = text.geom.yFactor * fontSize;
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div.style.fontSize = fontHeight + 'px';
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// TODO: family should be '= font.loadedName', but some fonts don't
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// have spacing info (cf. fonts.js > Font > fields > htmx)
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div.style.fontFamily = 'serif';
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div.style.left = text.geom.x + 'px';
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div.style.top = (text.geom.y - fontHeight) + 'px';
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div.innerHTML = text.str;
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div.dataset.canvasWidth = text.canvasWidth * text.geom.xFactor;
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div.dataset.textLength = text.length;
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this.textDivs.push(div);
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}
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if (textSelection)
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this.pushTextDivs(text);
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},
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nextLineShowText: function canvasGraphicsNextLineShowText(text) {
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this.nextLine();
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@ -1797,7 +1797,7 @@ var Font = (function Font() {
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return rule;
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},
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charsToGlyphs: function fonts_chars2Glyphs(chars) {
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charsToGlyphs: function fonts_chars2Glyphs(chars, suppressWarnings) {
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var charsCache = this.charsCache;
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var glyphs;
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@ -1830,7 +1830,8 @@ var Font = (function Font() {
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var charcode = int16([chars.charCodeAt(i++), chars.charCodeAt(i)]);
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var glyph = encoding[charcode];
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if ('undefined' == typeof(glyph)) {
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warn('Unencoded charcode ' + charcode);
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if (!suppressWarnings)
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warn('Unencoded charcode ' + charcode);
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glyph = {
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unicode: charcode,
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width: this.defaultWidth
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@ -1847,7 +1848,8 @@ var Font = (function Font() {
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var charcode = chars.charCodeAt(i);
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var glyph = encoding[charcode];
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if ('undefined' == typeof(glyph)) {
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warn('Unencoded charcode ' + charcode);
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if (!suppressWarnings)
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warn('Unencoded charcode ' + charcode);
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glyph = {
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unicode: charcode,
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width: this.defaultWidth
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