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Basic transforms of PDF page/text space to canvas space

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This commit is contained in:
Chris Jones 2011-05-05 22:20:07 -05:00
parent b860bc8d60
commit 68f1ca51ce
2 changed files with 26 additions and 4 deletions
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26
pdf.js
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@ -761,6 +761,8 @@ var Interpreter = (function() {
return this.interpretHelper(new Parser(new Lexer(obj), true));
},
interpretHelper: function(parser) {
this.gfx.beginDrawing();
var args = [ ];
var obj;
while (!((obj = parser.getObj()).isEOF())) {
@ -781,6 +783,8 @@ var Interpreter = (function() {
args.push(obj);
}
}
this.gfx.endDrawing();
},
typeCheck: function(params, args) {
if (params.length != args.length)
@ -806,6 +810,11 @@ var EchoGraphics = (function() {
}
constructor.prototype = {
beginDrawing: function () {
},
endDrawing: function () {
},
// Graphics state
setLineWidth: function(width) {
this.printdentln(width +" w");
@ -934,13 +943,22 @@ var CanvasExtraState = (function() {
})();
var CanvasGraphics = (function() {
function constructor(canvasCtx, hdpi, vdpi, pageBox) {
function constructor(canvasCtx) {
this.ctx = canvasCtx;
this.current = new CanvasExtraState();
this.stateStack = [ ];
}
constructor.prototype = {
beginDrawing: function () {
this.ctx.save();
this.ctx.scale(1, -1);
this.ctx.translate(0, -this.ctx.canvas.height);
},
endDrawing: function () {
this.ctx.restore();
},
// Graphics state
setLineWidth: function(width) {
this.ctx.lineWidth = width;
@ -1011,7 +1029,13 @@ var CanvasGraphics = (function() {
this.current.lineY = y;
},
showText: function(text) {
this.ctx.save();
this.ctx.translate(0, 2 * this.current.lineY);
this.ctx.scale(1, -1);
this.ctx.fillText(text, this.current.lineX, this.current.lineY);
this.ctx.restore();
},
// Type3 fonts