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