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      1 /*
      2  * Copyright 2011 Google Inc.
      3  *
      4  * Use of this source code is governed by a BSD-style license that can be
      5  * found in the LICENSE file.
      6  */
      7 #include "Sample.h"
      8 #include "SkCanvas.h"
      9 #include "SkPath.h"
     10 #include "SkRandom.h"
     11 
     12 class HairCurvesView : public Sample {
     13 public:
     14     HairCurvesView() {
     15     }
     16 
     17 protected:
     18     virtual bool onQuery(Sample::Event* evt) {
     19         if (Sample::TitleQ(*evt)) {
     20             Sample::TitleR(evt, "HairCurves");
     21             return true;
     22         }
     23         return this->INHERITED::onQuery(evt);
     24     }
     25 
     26 
     27     virtual void onDrawContent(SkCanvas* canvas) {
     28         SkPaint paint;
     29         paint.setAntiAlias(true);
     30         paint.setStyle(SkPaint::kStroke_Style);
     31         paint.setStrokeWidth(0);
     32         canvas->save();
     33         canvas->scale(1000 * SK_Scalar1, 1000 * SK_Scalar1);
     34         SkRandom rand;
     35         SkRandom randW;
     36         SkPath curves;
     37         SkPath hulls;
     38         SkPath ctrlPts;
     39         for (int i = 0; i < 100; ++i) {
     40             SkScalar pts[] = {
     41                 rand.nextUScalar1(), rand.nextUScalar1(),
     42                 rand.nextUScalar1(), rand.nextUScalar1(),
     43                 rand.nextUScalar1(), rand.nextUScalar1(),
     44                 rand.nextUScalar1(), rand.nextUScalar1()
     45             };
     46             curves.moveTo(pts[0], pts[1]);
     47             curves.cubicTo(pts[2], pts[3],
     48                          pts[4], pts[5],
     49                          pts[6], pts[7]);
     50 
     51             hulls.moveTo(pts[0], pts[1]);
     52             hulls.lineTo(pts[2], pts[3]);
     53             hulls.lineTo(pts[4], pts[5]);
     54             hulls.lineTo(pts[6], pts[7]);
     55 
     56             ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
     57             ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
     58             ctrlPts.addCircle(pts[4], pts[5], SK_Scalar1 / 200);
     59             ctrlPts.addCircle(pts[6], pts[7], SK_Scalar1 / 200);
     60         }
     61         for (int i = 0; i < 100; ++i) {
     62             SkScalar pts[] = {
     63                 rand.nextUScalar1(), rand.nextUScalar1(),
     64                 rand.nextUScalar1(), rand.nextUScalar1(),
     65                 rand.nextUScalar1(), rand.nextUScalar1(),
     66             };
     67             curves.moveTo(pts[0], pts[1]);
     68             curves.quadTo(pts[2], pts[3],
     69                           pts[4], pts[5]);
     70 
     71             hulls.moveTo(pts[0], pts[1]);
     72             hulls.lineTo(pts[2], pts[3]);
     73             hulls.lineTo(pts[4], pts[5]);
     74 
     75             ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
     76             ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
     77             ctrlPts.addCircle(pts[4], pts[5], SK_Scalar1 / 200);
     78         }
     79         for (int i = 0; i < 100; ++i) {
     80             SkScalar pts[] = {
     81                 rand.nextUScalar1(), rand.nextUScalar1(),
     82                 rand.nextUScalar1(), rand.nextUScalar1(),
     83                 rand.nextUScalar1(), rand.nextUScalar1(),
     84             };
     85             SkScalar weight = randW.nextUScalar1() * 2.0f;
     86 
     87             curves.moveTo(pts[0], pts[1]);
     88             curves.conicTo(pts[2], pts[3],
     89                           pts[4], pts[5],
     90                           weight);
     91 
     92             hulls.moveTo(pts[0], pts[1]);
     93             hulls.lineTo(pts[2], pts[3]);
     94             hulls.lineTo(pts[4], pts[5]);
     95 
     96             ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
     97             ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
     98             ctrlPts.addCircle(pts[4], pts[5], SK_Scalar1 / 200);
     99         }
    100         for (int i = 0; i < 100; ++i) {
    101             SkScalar pts[] = {
    102                 rand.nextUScalar1(), rand.nextUScalar1(),
    103                 rand.nextUScalar1(), rand.nextUScalar1(),
    104             };
    105             curves.moveTo(pts[0], pts[1]);
    106             curves.lineTo(pts[2], pts[3]);
    107 
    108             ctrlPts.addCircle(pts[0], pts[1], SK_Scalar1 / 200);
    109             ctrlPts.addCircle(pts[2], pts[3], SK_Scalar1 / 200);
    110         }
    111 
    112         paint.setColor(SK_ColorBLACK);
    113         canvas->drawPath(curves, paint);
    114         paint.setColor(SK_ColorRED);
    115         //canvas->drawPath(hulls, paint);
    116         paint.setStyle(SkPaint::kFill_Style);
    117         paint.setColor(SK_ColorBLUE);
    118         //canvas->drawPath(ctrlPts, paint);
    119 
    120         canvas->restore();
    121     }
    122 
    123 private:
    124     typedef Sample INHERITED;
    125 };
    126 
    127 //////////////////////////////////////////////////////////////////////////////
    128 
    129 DEF_SAMPLE( return new HairCurvesView(); )
    130