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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 "SampleCode.h"
      9 #include "SkAnimTimer.h"
     10 #include "SkBlurMaskFilter.h"
     11 #include "SkColorPriv.h"
     12 #include "SkCanvas.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 SampleView {
     26 public:
     27     AnimBlurView() : fBlurSigma(0), fCircleRadius(100) {}
     28 
     29 protected:
     30     // overrides from SkEventSink
     31     bool onQuery(SkEvent* evt) override {
     32         if (SampleCode::TitleQ(*evt)) {
     33             SampleCode::TitleR(evt, "AnimBlur");
     34             return true;
     35         }
     36         return this->INHERITED::onQuery(evt);
     37     }
     38 
     39     void onDrawContent(SkCanvas* canvas) override {
     40         static const SkBlurStyle gStyles[] = {
     41             kNormal_SkBlurStyle,
     42             kInner_SkBlurStyle,
     43             kSolid_SkBlurStyle,
     44             kOuter_SkBlurStyle,
     45         };
     46         SkRandom random;
     47 
     48         for (size_t i = 0; i < SK_ARRAY_COUNT(gStyles); ++i) {
     49             SkPaint paint;
     50             paint.setMaskFilter(SkBlurMaskFilter::Make(gStyles[i],
     51                                                        fBlurSigma,
     52                                                        SkBlurMaskFilter::kHighQuality_BlurFlag));
     53             paint.setColor(random.nextU() | 0xff000000);
     54             canvas->drawCircle(200 * SK_Scalar1 + 400 * (i % 2) * SK_Scalar1,
     55                                200 * SK_Scalar1 + i / 2 * 400 * SK_Scalar1,
     56                                fCircleRadius, paint);
     57         }
     58     }
     59 
     60     bool onAnimate(const SkAnimTimer& timer) override {
     61         fBlurSigma = get_anim_sin(timer.secs(), 100, 4, 5);
     62         fCircleRadius = 3 + get_anim_sin(timer.secs(), 150, 25, 3);
     63         return true;
     64     }
     65 
     66 private:
     67     SkScalar fBlurSigma, fCircleRadius;
     68 
     69     typedef SampleView INHERITED;
     70 };
     71 
     72 //////////////////////////////////////////////////////////////////////////////
     73 
     74 static SkView* MyFactory() { return new AnimBlurView; }
     75 static SkViewRegister reg(MyFactory);
     76