akira
/
pdfjs-dist
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity
Browse Source

implementing transform matrix to getTextContent

Srishti 12 years ago
parent
4f243b39b4
commit
3808d02a53
3 changed files with 137 additions and 0 deletions
Whitespace
Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL
Split View
Diff Options
Show Stats Download Patch File Download Diff File
  1. 129
      src/core/evaluator.js
  2. 7
      web/text_layer_builder.js
  3. 1
      web/viewer.js

129
src/core/evaluator.js
Unescape View File

@ -725,14 +725,18 @@ var PartialEvaluator = (function PartialEvaluatorClosure() { @@ -725,14 +725,18 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
var bidiTexts;
var SPACE_FACTOR = 0.35;
var MULTI_SPACE_FACTOR = 1.5;
var textState;
if (!state) {
textState = new TextState();
bidiTexts = [];
state = {
textState: textState,
bidiTexts: bidiTexts
};
} else {
bidiTexts = state.bidiTexts;
textState = state.textState;
}
var self = this;
@ -752,6 +756,7 @@ var PartialEvaluator = (function PartialEvaluatorClosure() { @@ -752,6 +756,7 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
var chunk = '';
var font = null;
var charSpace = 0, wordSpace = 0;
while (!isEOF(obj = parser.getObj())) {
if (isCmd(obj)) {
var cmd = obj.cmd;
@ -759,6 +764,49 @@ var PartialEvaluator = (function PartialEvaluatorClosure() { @@ -759,6 +764,49 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
// TODO: Add support for SAVE/RESTORE and XFORM here.
case 'Tf':
font = handleSetFont(args[0].name).translated;
textState.fontSize = args[1];
break;
case 'Ts':
textState.textRise = args[0];
break;
case 'Tz':
textState.textHScale = args[0] / 100;
break;
case 'TL':
textState.leading = args[0];
break;
case 'Td':
textState.translateTextMatrix(args[0], args[1]);
break;
case 'TD':
textState.leading = -args[1];
textState.translateTextMatrix(args[0], args[1]);
break;
case 'T*':
textState.translateTextMatrix(0, -textState.leading);
break;
case 'Tm':
textState.setTextMatrix(args[0], args[1],
args[2], args[3], args[4], args[5]);
break;
case 'Tc':
charSpace = args[0];
break;
case 'Tw':
wordSpace = args[0];
break;
case 'q':
textState.push();
break;
case 'Q':
textState.pop();
break;
case 'BT':
textState.initialiseTextObj();
break;
case 'cm':
textState.transformCTM(args[0], args[1], args[2],
args[3], args[4], args[5]);
break;
case 'TJ':
var items = args[0];
@ -844,6 +892,15 @@ var PartialEvaluator = (function PartialEvaluatorClosure() { @@ -844,6 +892,15 @@ var PartialEvaluator = (function PartialEvaluatorClosure() {
if (chunk !== '') {
var bidiText = PDFJS.bidi(chunk, -1, font.vertical);
var renderParams = textState.calcRenderParams();
bidiText.x = renderParams.renderMatrix[4] - (textState.fontSize *
renderParams.vScale * Math.sin(renderParams.angle));
bidiText.y = renderParams.renderMatrix[5] + (textState.fontSize *
renderParams.vScale * Math.cos(renderParams.angle));
if (bidiText.dir == 'ttb') {
bidiText.x += renderParams.vScale / 2;
bidiText.y -= renderParams.vScale;
}
bidiTexts.push(bidiText);
chunk = '';
@ -1552,6 +1609,78 @@ var OperatorList = (function OperatorListClosure() { @@ -1552,6 +1609,78 @@ var OperatorList = (function OperatorListClosure() {
return OperatorList;
})();
var TextState = (function TextStateClosure() {
function TextState() {
this.fontSize = 0;
this.ctm = [1, 0, 0, 1, 0, 0];
this.textMatrix = [1, 0, 0, 1, 0, 0];
this.stateStack = [];
//textState variables
this.leading = 0;
this.textHScale = 1;
this.textRise = 0;
}
TextState.prototype = {
push: function TextState_push() {
this.stateStack.push(this.ctm.slice());
},
pop: function TextStae_pop() {
this.ctm = this.stateStack.pop();
},
initialiseTextObj: function TextState_initialiseTextObj() {
var m = this.textMatrix;
m[0] = 1, m[1] = 0, m[2] = 0, m[3] = 1, m[4] = 0, m[5] = 0;
},
setTextMatrix: function TextState_setTextMatrix(a, b, c, d, e, f) {
var m = this.textMatrix;
m[0] = a, m[1] = b, m[2] = c, m[3] = d, m[4] = e, m[5] = f;
},
transformCTM: function TextState_transformCTM(a, b, c, d, e, f) {
var m = this.ctm;
var m0 = m[0], m1 = m[1], m2 = m[2], m3 = m[3], m4 = m[4], m5 = m[5];
m[0] = m0 * a + m2 * b;
m[1] = m1 * a + m3 * b;
m[2] = m0 * c + m2 * d;
m[3] = m1 * c + m3 * d;
m[4] = m0 * e + m2 * f + m4;
m[5] = m1 * e + m3 * f + m5;
},
translateTextMatrix: function TextState_translateTextMatrix(x, y) {
var m = this.textMatrix;
m[4] = m[0] * x + m[2] * y + m[4];
m[5] = m[1] * x + m[3] * y + m[5];
},
calcRenderParams: function TextState_calcRenderingParams() {
var tm = this.textMatrix;
var cm = this.ctm;
var a = this.fontSize;
var b = a * this.textHScale;
var c = this.textRise;
var vScale = Math.sqrt((tm[2] * tm[2]) + (tm[3] * tm[3]));
var angle = Math.atan2(tm[1], tm[0]);
var m0 = tm[0] * cm[0] + tm[1] * cm[2];
var m1 = tm[0] * cm[1] + tm[1] * cm[3];
var m2 = tm[2] * cm[0] + tm[3] * cm[2];
var m3 = tm[2] * cm[1] + tm[3] * cm[3];
var m4 = tm[4] * cm[0] + tm[5] * cm[2] + cm[4];
var m5 = tm[4] * cm[1] + tm[5] * cm[3] + cm[5];
var renderMatrix = [
b * m0,
b * m1,
a * m2,
a * m3,
c * m2 + m4,
c * m3 + m5
];
return {
renderMatrix: renderMatrix,
vScale: vScale,
angle: angle
};
},
};
return TextState;
})();
var EvalState = (function EvalStateClosure() {
function EvalState() {

7
web/text_layer_builder.js
Unescape View File

@ -36,6 +36,7 @@ var TextLayerBuilder = function textLayerBuilder(options) { @@ -36,6 +36,7 @@ var TextLayerBuilder = function textLayerBuilder(options) {
this.pageIdx = options.pageIndex;
this.matches = [];
this.lastScrollSource = options.lastScrollSource;
this.viewport = options.viewport;
this.isViewerInPresentationMode = options.isViewerInPresentationMode;
if(typeof PDFFindController === 'undefined') {
@ -158,6 +159,12 @@ var TextLayerBuilder = function textLayerBuilder(options) { @@ -158,6 +159,12 @@ var TextLayerBuilder = function textLayerBuilder(options) {
}
textDiv.textContent = bidiText.str;
// TODO refactor text layer to use text content position
/**
* var arr = this.viewport.convertToViewportPoint(bidiText.x, bidiText.y);
* textDiv.style.left = arr[0] + 'px';
* textDiv.style.top = arr[1] + 'px';
*/
// bidiText.dir may be 'ttb' for vertical texts.
textDiv.dir = bidiText.dir;
}

1
web/viewer.js
Unescape View File

@ -1912,6 +1912,7 @@ var PageView = function pageView(container, id, scale, @@ -1912,6 +1912,7 @@ var PageView = function pageView(container, id, scale,
textLayerDiv: textLayerDiv,
pageIndex: this.id - 1,
lastScrollSource: PDFView,
viewport: this.viewport,
isViewerInPresentationMode: PDFView.isPresentationMode
}) : null;

Write Preview
Loading…
Cancel
Save