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      1 /*
      2  * Copyright 2012 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 
      8 #include "Sample.h"
      9 #include "SkAnimTimer.h"
     10 #include "SkColorPriv.h"
     11 #include "SkCanvas.h"
     12 #include "SkMaskFilter.h"
     13 #include "SkRandom.h"
     14 
     15 SkScalar get_anim_sin(double secs, SkScalar amplitude, SkScalar periodInSec, SkScalar phaseInSec) {
     16     if (!periodInSec) {
     17         return 0;
     18     }
     19     double t = secs + phaseInSec;
     20     t *= SkScalarToFloat(2 * SK_ScalarPI) / periodInSec;
     21     amplitude = SK_ScalarHalf * amplitude;
     22     return amplitude * SkDoubleToScalar(sin(t)) + amplitude;
     23 }
     24 
     25 class AnimBlurView : public Sample {
     26 public:
     27     AnimBlurView() : fBlurSigma(0), fCircleRadius(100) {}
     28 
     29 protected:
     30     bool onQuery(Sample::Event* evt) override {
     31         if (Sample::TitleQ(*evt)) {
     32             Sample::TitleR(evt, "AnimBlur");
     33             return true;
     34         }
     35         return this->INHERITED::onQuery(evt);
     36     }
     37 
     38     void onDrawContent(SkCanvas* canvas) override {
     39         static const SkBlurStyle gStyles[] = {
     40             kNormal_SkBlurStyle,
     41             kInner_SkBlurStyle,
     42             kSolid_SkBlurStyle,
     43             kOuter_SkBlurStyle,
     44         };
     45         SkRandom random;
     46 
     47         for (size_t i = 0; i < SK_ARRAY_COUNT(gStyles); ++i) {
     48             SkPaint paint;
     49             paint.setMaskFilter(SkMaskFilter::MakeBlur(gStyles[i],
     50                                                        fBlurSigma));
     51             paint.setColor(random.nextU() | 0xff000000);
     52             canvas->drawCircle(200 * SK_Scalar1 + 400 * (i % 2) * SK_Scalar1,
     53                                200 * SK_Scalar1 + i / 2 * 400 * SK_Scalar1,
     54                                fCircleRadius, paint);
     55         }
     56     }
     57 
     58     bool onAnimate(const SkAnimTimer& timer) override {
     59         fBlurSigma = get_anim_sin(timer.secs(), 100, 4, 5);
     60         fCircleRadius = 3 + get_anim_sin(timer.secs(), 150, 25, 3);
     61         return true;
     62     }
     63 
     64 private:
     65     SkScalar fBlurSigma, fCircleRadius;
     66 
     67     typedef Sample INHERITED;
     68 };
     69 
     70 //////////////////////////////////////////////////////////////////////////////
     71 
     72 DEF_SAMPLE( return new AnimBlurView(); )
     73