aboutsummaryrefslogtreecommitdiff
path: root/js/helper-classes/backup-delete/GLBrushStroke.js
blob: 26c922a3317bf604c59bda219206deb39b582616 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
/* <copyright>
This file contains proprietary software owned by Motorola Mobility, Inc.<br/>
No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.<br/>
(c) Copyright 2011 Motorola Mobility, Inc.  All Rights Reserved.
</copyright> */

// Todo: This entire class should be converted to a module
var VecUtils = require("js/helper-classes/3D/vec-utils").VecUtils;

///////////////////////////////////////////////////////////////////////
// Class GLBrushStroke
//      representation a sequence points (polyline) created by brush tool.
//      Derived from class GLGeomObj
///////////////////////////////////////////////////////////////////////
function GLBrushStroke() {
    ///////////////////////////////////////////////////
    // Instance variables
    ///////////////////////////////////////////////////
    this._Points = [];
    this._BBoxMin = [0, 0, 0];
    this._BBoxMax = [0, 0, 0];
    this._dirty = true;

    //whether or not to use the canvas drawing to stroke/fill
    this._useCanvasDrawing = true;

    //the X and Y location of this subpath's canvas in stage world space of Ninja
    this._canvasX = 0;
    this._canvasY = 0;

    //stroke information
    this._strokeWidth = 0.0;
    this._strokeColor = [0.4, 0.4, 0.4, 1.0];
    this._secondStrokeColor = this._strokeColor;
    this._strokeHardness = 100;
    this._strokeMaterial;
    this._strokeStyle = "Solid";

    //the wetness of the brush (currently this is multiplied to the square of the stroke width, but todo should be changed to not depend on stroke width entirely
    //smaller value means more samples for the path
    this._WETNESS_FACTOR = 0.25;

    //prevent extremely long paths that can take a long time to render
    this._MAX_ALLOWED_SAMPLES = 5000;

    //drawing context
    this._world = null;

    //tool that owns this brushstroke
    this._drawingTool = null;
    this._planeMat = null;
    this._planeMatInv = null;
    this._planeCenter = null;

    // initialize the inherited members
    this.inheritedFrom = GLGeomObj;
    this.inheritedFrom();

    /////////////////////////////////////////////////////////
    // Property Accessors/Setters
    /////////////////////////////////////////////////////////
    this.setWorld = function (world) { this._world = world; }
    this.getWorld = function () { return this._world; }
    this.geomType = function () { return this.GEOM_TYPE_CUBIC_BEZIER; }
    this.setDrawingTool = function (tool) {this._drawingTool = tool;}
    this.getDrawingTool = function () {return this._drawingTool;}
    this.setPlaneMatrix = function(planeMat){this._planeMat = planeMat;}
    this.setPlaneMatrixInverse = function(planeMatInv){this._planeMatInv = planeMatInv;}
    this.setPlaneCenter = function(pc){this._planeCenter = pc;}

    this.getCanvasX = function(){return this._canvasX;}
    this.getCanvasY = function(){return this._canvasY;}
    this.setCanvasX = function(cx){this._canvasX=cx;}
    this.setCanvasY = function(cy){this._canvasY=cy;}
        

    this.getNumPoints = function () { return this._Points.length; }
    this.getPoint = function (index) { return this._Points[index]; }
    this.addPoint = function (pt)
    {
        //add the point only if it is some epsilon away from the previous point
        var numPoints = this._Points.length;
        if (numPoints>0) {
            var threshold = 1;//this._WETNESS_FACTOR*this._strokeWidth;
            var prevPt = this._Points[numPoints-1];
            var diffPt = [prevPt[0]-pt[0], prevPt[1]-pt[1]];
            var diffPtMag = Math.sqrt(diffPt[0]*diffPt[0] + diffPt[1]*diffPt[1]);
            if (diffPtMag>threshold){
                this._Points.push(pt);
                this._dirty=true;
            }
        }else{
            this._Points.push(pt);
            this._dirty=true;
        }
    }
    
    this.insertPoint = function(pt, index){ this._Points.splice(index, 0, pt); this._dirty=true;}
    this.isDirty = function(){return this._dirty;}
    this.makeDirty = function(){this._dirty=true;}

    this.getBBoxMin = function () { return this._BBoxMin; }
    this.getBBoxMax = function () { return this._BBoxMax; }

    this.getStrokeWidth = function () { return this._strokeWidth; }
    this.setStrokeWidth = function (w) { this._strokeWidth = w; this._dirty=true;}
    this.getStrokeMaterial = function () { return this._strokeMaterial; }
    this.setStrokeMaterial = function (m) { this._strokeMaterial = m; }
    this.getStrokeColor = function () { return this._strokeColor; }
    this.setStrokeColor = function (c) { this._strokeColor = c; }
    this.setSecondStrokeColor = function(c){this._secondStrokeColor=c;}
    this.setStrokeHardness = function(h){this._strokeHardness=h;}
    this.getStrokeStyle = function () { return this._strokeStyle; }
    this.setStrokeStyle = function (s) { this._strokeStyle = s; }

    this.setWidth = function () { }//NO-OP for now
    this.setHeight = function () {}//NO-OP for now


    //remove and return anchor at specified index, return null on error
    this.removePoint = function (index) {
        var retAnchor = null;
        if (index < this._Points.length) {
            retPt = this._Points.splice(index, 1);
            this._dirty=true;
        }
        return retPoint;
    }

    //remove all the points
    this.clear = function () { this._Points = []; this._dirty=true;}

    this.translate = function (tx, ty, tz) {
        for (var i=0;i<this._Points.length;i++){
            this._Points[i][0]+=tx;
            this._Points[i][1]+=ty;
            this._Points[i][2]+=tz;
        }
    }
    
    this.computeMetaGeometry = function(){
        if (this._dirty){
            var numPoints = this._Points.length;

            //**** add samples to the path if needed...linear interpolation for now
            //if (numPoints>1) {
            if (0){
                var threshold = this._WETNESS_FACTOR*this._strokeWidth;
                var prevPt = this._Points[0];
                var prevIndex = 0;
                for (var i=1;i<numPoints;i++){
                    var pt = this._Points[i];
                    var diff = [pt[0]-prevPt[0], pt[1]-prevPt[1]];
                    var distance = Math.sqrt(diff[0]*diff[0]+diff[1]*diff[1]);
                    if (distance>threshold){
                        //insert points along the prev. to current point
                        var numNewPoints = Math.floor(distance/threshold);
                        for (var j=0;j<numNewPoints;j++){
                            var param = (j+1)/(numNewPoints+1);
                            var newpt = [prevPt[0]+ diff[0]*param, prevPt[1]+ diff[1]*param];
                            //insert new point before point i
                            this._Points.splice(i, 0, [newpt[0], newpt[1], 0]);
                            i++;
                        }
                        this._dirty=true;
                    }
                    prevPt=pt;
                    //update numPoints to match the new length
                    numPoints = this._Points.length;

                    //end this function if the numPoints has gone above the max. size specified
                    if (numPoints> this._MAX_ALLOWED_SAMPLES){
                        console.log("leaving the resampling because numPoints is greater than limit:"+this._MAX_ALLOWED_SAMPLES);
                        break;
                    }
                }
            }

            //**** add samples to the long sections of the path --- Catmull-Rom spline interpolation
            if (numPoints>1) {
                var numInsertedPoints = 0;
                var threshold = 5;//0.25*this._strokeWidth; //this determines whether a segment between two sample is too long
                var prevPt = this._Points[0];
                for (var i=1;i<numPoints;i++){
                    var pt = this._Points[i];
                    var diff = [pt[0]-prevPt[0], pt[1]-prevPt[1]];
                    var distance = Math.sqrt(diff[0]*diff[0]+diff[1]*diff[1]);
                    if (distance>threshold){
                        //build the control polygon for the Catmull-Rom spline (prev. 2 points and next 2 points)
                        var prev = (i===1) ? i-1 : i-2;
                        var next = (i===numPoints-1) ? i : i+1;
                        var ctrlPts = [this._Points[prev], this._Points[i-1], this._Points[i], this._Points[next]];
                        //insert points along the prev. to current point
                        var numNewPoints = Math.floor(distance/threshold);
                        for (var j=0;j<numNewPoints;j++){
                            var param = (j+1)/(numNewPoints+1);
                            var newpt = this._CatmullRomSplineInterpolate(ctrlPts, param);
                            //insert new point before point i
                            this._Points.splice(i, 0, newpt);
                            i++;
                            numInsertedPoints++;
                        }
                        this._dirty=true;
                    }
                    prevPt=pt;
                    //update numPoints to match the new length
                    numPoints = this._Points.length;

                    //end this function if the numPoints has gone above the max. size specified
                    if (numPoints> this._MAX_ALLOWED_SAMPLES){
                        console.log("leaving the resampling because numPoints is greater than limit:"+this._MAX_ALLOWED_SAMPLES);
                        break;
                    }
                }
                console.log("Inserted "+numInsertedPoints+" additional CatmullRom points");
            }
            // *** compute the bounding box *********
            this._BBoxMin = [Infinity, Infinity, Infinity];
            this._BBoxMax = [-Infinity, -Infinity, -Infinity];
            numPoints = this._Points.length;
            if (numPoints === 0) {
                this._BBoxMin = [0, 0, 0];
                this._BBoxMax = [0, 0, 0];
            } else {
                for (var i=0;i<numPoints;i++){
                    var pt = this._Points[i];
                    for (var d = 0; d < 3; d++) {
                        if (this._BBoxMin[d] > pt[d]) {
                            this._BBoxMin[d] = pt[d];
                        }
                        if (this._BBoxMax[d] < pt[d]) {
                            this._BBoxMax[d] = pt[d];
                        }
                    }//for every dimension d from 0 to 2
                }
            }
             //increase the bbox given the stroke width
            for (var d = 0; d < 3; d++) {
                this._BBoxMin[d]-= this._strokeWidth/2;
                this._BBoxMax[d]+= this._strokeWidth/2;
            }//for every dimension d from 0 to 2
        }
        this._dirty = false;
    }

    this.buildBuffers = function () {
        return; //no need to do anything for now
    }//buildBuffers()

    //render
    //  specify how to render the subpath in Canvas2D
    this.render = function () {
        // get the world
        var world = this.getWorld();
        if (!world)  throw( "null world in brushstroke render" );

         // get the context
        var ctx = world.get2DContext();
        if (!ctx)  throw ("null context in brushstroke render")

        var numPoints = this.getNumPoints();
        if (numPoints === 0)
            return; //nothing to do for empty paths

        ctx.save();

        this.computeMetaGeometry();
        var bboxMin = this.getBBoxMin();
        var bboxMax = this.getBBoxMax();
        var bboxWidth = bboxMax[0] - bboxMin[0];
        var bboxHeight = bboxMax[1] - bboxMin[1];
        ctx.clearRect(0, 0, bboxWidth, bboxHeight);

        /*
        ctx.lineWidth = this._strokeWidth;
        ctx.strokeStyle = "black";
        if (this._strokeColor)
            ctx.strokeStyle = MathUtils.colorToHex( this._strokeColor );
        ctx.fillStyle = "blue";
        if (this._fillColor)
            ctx.fillStyle = MathUtils.colorToHex( this._fillColor );
        var lineCap = ['butt','round','square'];
        ctx.lineCap = lineCap[1];
        ctx.beginPath();
        var firstPoint = this._Points[0];
        ctx.moveTo(firstPoint[0]-bboxMin[0], firstPoint[1]-bboxMin[1]);
        for (var i = 1; i < numPoints; i++) {
            var pt = this._Points[i];
            ctx.lineTo(pt[0]-bboxMin[0], pt[1]-bboxMin[1]);
        }
        ctx.stroke();
        */

        /*
        var isDebug = false;
        var prevPt = this._Points[0];
        var prevX = prevPt[0]-bboxMin[0];
        var prevY = prevPt[1]-bboxMin[1];
        prevPt = [prevX,prevY];
        for (var i = 1; i < numPoints; i++) {
            var pt = this._Points[i];
            ctx.globalCompositeOperation = 'source-over';
            var x = pt[0]-bboxMin[0];
            var y = pt[1]-bboxMin[1];
            pt = [x,y];

            //vector from prev to current pt
            var seg = VecUtils.vecSubtract(2, pt, prevPt);
            var segDir = VecUtils.vecNormalize(2, seg, 1.0);

            var segMidPt = VecUtils.vecInterpolate(2, pt, prevPt, 0.5);
            var w2 = this._strokeWidth*0.5;
            var segDirOrtho = [w2*segDir[1], -w2*segDir[0]];
            
            //add half the strokewidth to the segMidPt
            var lgStart = VecUtils.vecAdd(2, segMidPt, segDirOrtho);
            var lgEnd = VecUtils.vecSubtract(2, segMidPt, segDirOrtho);

            ctx.save();
            ctx.beginPath();

            if (isDebug) {
                ctx.strokeStyle="black";
                ctx.lineWidth = 1;

                ctx.moveTo(lgStart[0], lgStart[1]);
                ctx.lineTo(lgEnd[0], lgEnd[1]);
                ctx.stroke();
            }

            var lg = ctx.createLinearGradient(lgStart[0], lgStart[1], lgEnd[0], lgEnd[1]);
            lg.addColorStop(1, 'rgba(0,0,0,0.0)');
            lg.addColorStop(0.5,'rgba(255,0,0,1.0)');
            lg.addColorStop(0, 'rgba(0,0,0,0.0)');
            ctx.fillStyle = lg;

            if (isDebug){
                ctx.strokeStyle="blue";
                ctx.lineWidth=0.5;
            }
            ctx.moveTo(prevX-w2, prevY);
            ctx.lineTo(prevX+w2, prevY);
            ctx.lineTo(x+w2, y);
            ctx.lineTo(x-w2, y);
            ctx.lineTo(prevX-w2, prevY);
            ctx.fill();
            ctx.closePath();

            ctx.restore();

            prevPt = pt;
            prevX = x;
            prevY = y;
        }
        

        if (isDebug)
            ctx.stroke();

        if (isDebug){
            //draw the skeleton of this stroke
            ctx.lineWidth = 1;
            ctx.strokeStyle = "black";
            var pt = this._Points[0];
            ctx.beginPath();
            ctx.moveTo(pt[0]-bboxMin[0],pt[1]-bboxMin[1]);
            for (var i = 1; i < numPoints; i++) {
                pt = this._Points[i];
                var x = pt[0]-bboxMin[0];
                var y = pt[1]-bboxMin[1];
                ctx.lineTo(x,y);
            }
            ctx.stroke();
        }
        */

        /*
        //build the stamp for the brush stroke
        //todo get this directly from the UI
        var t=0;
        var numTraces = this._strokeWidth;
        var halfNumTraces = numTraces/2;
        var startPos = [-this._strokeWidth/2,0];
        var brushStamp = [];

        //build an angled (calligraphic) brush stamp
        var deltaDisplacement = [1,1];//[this._strokeWidth/numTraces, 0]; //a horizontal line brush
        for (t=0;t<numTraces;t++){
            var brushPt = [startPos[0]+t*deltaDisplacement[0], startPos[1]+t*deltaDisplacement[1]];
            brushStamp.push(brushPt);
        }


        //make a circular brush stamp
        brushStamp=[];
        numTraces = this._strokeWidth*Math.PI; //figure out how to
        var radius = this._strokeWidth/2;
        for (t=0;t<numTraces;t++)
        {
            var angle = Math.PI*(360*t/numTraces)/180;
            var brushPt = [radius*Math.cos(angle), radius*Math.sin(angle)];
            brushStamp.push(brushPt);
        }
        
//        //make a square brush stamp
//        STOPPED HERE
//        brushStamp = [];
//        numTraces = 4*strokeWidth;
//        for (t=0;t<numTraces;t++){
//            if (t<numTraces*0.25){
//                var brushPt = [startPos[0]+t*deltaDisplacement[0], startPos[1]+t*deltaDisplacement[1]];
//            } else if (t<numTraces*0.5){
//
//            } else if (t<numTraces*0.75){
//
//            } else {
//
//            }
//            brushStamp.push(brushPt);
//        }

        for (t=0;t<numTraces;t++){
            var disp = [brushStamp[t][0], brushStamp[t][1]];
            //ctx.globalCompositeOperation = 'source-over';
            var distFromMiddle = Math.abs(halfNumTraces-t);
            var alphaVal = 1.0 - (100-this._strokeHardness)*(distFromMiddle/halfNumTraces)/100;
            alphaVal = 0.2;
            ctx.save();
            ctx.lineWidth=this._strokeWidth/10;//todo figure out the correct formula for the line width
            if (ctx.lineWidth<2)
                ctx.lineWidth=2;
            if (t===numTraces-1){
                ctx.lineWidth = 1; 
            }
            ctx.lineJoin="bevel";
            ctx.lineCap="butt";
            //if (t<numTraces/2)
                ctx.strokeStyle="rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+","+alphaVal+")";
            //else
            //    ctx.strokeStyle="rgba("+parseInt(255*this._secondStrokeColor[0])+","+parseInt(255*this._secondStrokeColor[1])+","+parseInt(255*this._secondStrokeColor[2])+","+alphaVal+")";
            ctx.translate(disp[0],disp[1]);
            ctx.beginPath();
            ctx.moveTo(this._Points[0][0]-bboxMin[0], this._Points[0][1]-bboxMin[1]);
            for (var i=0;i<numPoints;i++){
                ctx.lineTo(this._Points[i][0]-bboxMin[0], this._Points[i][1]-bboxMin[1]);
            }
            ctx.stroke();
            ctx.restore();
        }
        */

        /*
        //debugging path
        ctx.beginPath();
        ctx.moveTo(this._Points[0][0]-bboxMin[0], this._Points[0][1]-bboxMin[1]);
        for (var i=1;i<numPoints;i++){
            ctx.lineTo(this._Points[i][0]-bboxMin[0], this._Points[i][1]-bboxMin[1]);
        }
        ctx.lineWidth=1.0;
        ctx.strokeStyle = "black";
        ctx.stroke();
        */

        var numlayers = this._strokeWidth/2;
        var alphaVal = 1.0/(numlayers-1);
        for (var l=0;l<numlayers;l++){
            ctx.beginPath();
            ctx.moveTo(this._Points[0][0]-bboxMin[0], this._Points[0][1]-bboxMin[1]);
            for (var i=1;i<numPoints;i++){
                ctx.lineTo(this._Points[i][0]-bboxMin[0], this._Points[i][1]-bboxMin[1]);
            }
            ctx.lineCap = "round";
            ctx.lineJoin="round";
            ctx.lineWidth=l+1;
            ctx.strokeStyle="rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+","+alphaVal+")";
            ctx.stroke();
        }

        /*
        var R2 = this._strokeWidth;
        var R = R2*0.5;
        var hardness = 0; //for a pencil, this is always 1 //TODO get hardness parameter from user interface
        var innerRadius = (hardness*R)-1;
        if (innerRadius<1)
            innerRadius=1;

        var r = ctx.createRadialGradient(0,0,innerRadius, 0,0,R);
        var midColor = "rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+",1)";
        r.addColorStop(0, midColor);
        var endColor = "rgba("+parseInt(255*this._strokeColor[0])+","+parseInt(255*this._strokeColor[1])+","+parseInt(255*this._strokeColor[2])+",0.0)";
        r.addColorStop(1, endColor);
        ctx.fillStyle = r;

        for (var i = 0; i < numPoints; i++) {
            var pt = this._Points[i];
            ctx.globalCompositeOperation = 'source-over';
            var x = pt[0]-bboxMin[0];
            var y = pt[1]-bboxMin[1];
            ctx.save();
            ctx.translate(x,y);
            ctx.arc(0, 0, R, 0, 2 * Math.PI, false);
            ctx.fill();
            ctx.restore();
            break;
            //ctx.globalCompositeOperation = 'source-in';
            //ctx.rect(x-R, y-R, R2, R2);
        }
        */


        ctx.restore();
    } //render()


    this.export = function()
    {
        var rtnStr = "type: " + this.geomType() + "\n";
        return rtnStr;
    }

    this.import = function( importStr )
    {
    }

    this.collidesWithPoint = function (x, y, z) {
        if (x < this._BBoxMin[0]) return false;
        if (x > this._BBoxMax[0]) return false;
        if (y < this._BBoxMin[1]) return false;
        if (y > this._BBoxMax[1]) return false;
        if (z < this._BBoxMin[2]) return false;
        if (z > this._BBoxMax[2]) return false;

        return true;
    }

    this.collidesWithPoint = function (x, y) {
        if (x < this._BBoxMin[0]) return false;
        if (x > this._BBoxMax[0]) return false;
        if (y < this._BBoxMin[1]) return false;
        if (y > this._BBoxMax[1]) return false;

        return true;
    }

} //function GLBrushStroke ...class definition

GLBrushStroke.prototype._CatmullRomSplineInterpolate = function(ctrlPts, t)
{
    //perform CatmullRom interpolation on the spline...assume t is in [0,1]
    var t2 = t*t;
    var t3 = t2*t;
    var retPoint = [0,0,0];
    for (var i=0;i<3;i++){
        retPoint[i] = 0.5 *(
            (2*ctrlPts[1][i]) +
            (-ctrlPts[0][i] + ctrlPts[2][i]) * t +
            (2*ctrlPts[0][i] - 5*ctrlPts[1][i] + 4*ctrlPts[2][i] - ctrlPts[3][i]) * t2 +
            (-ctrlPts[0][i] + 3*ctrlPts[1][i]- 3*ctrlPts[2][i] + ctrlPts[3][i]) * t3);
    }
    return retPoint;
}