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Merge pull request #3695 from SSk123/transform

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Adding transformation to the extract code
This commit is contained in:
Yury Delendik 2013-09-19 18:45:59 -07:00
commit a8320b2e18
3 changed files with 137 additions and 0 deletions
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129
src/core/evaluator.js
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@ -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() {
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() {
// 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() {
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() {
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
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@ -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) {
}
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
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@ -1919,6 +1919,7 @@ var PageView = function pageView(container, id, scale,
textLayerDiv: textLayerDiv,
pageIndex: this.id - 1,
lastScrollSource: PDFView,
viewport: this.viewport,
isViewerInPresentationMode: PDFView.isPresentationMode
}) : null;