allow GMs to animate

samplecode/SampleHT.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SampleCode.h"
 #include "SkView.h"
 #include "SkCanvas.h"
@@ skipping 28 matching lines @@
 
 static SkColor rand_opaque_color(uint32_t seed) {
     SkRandom rand(seed);
     return rand.nextU() | (0xFF << 24);
 }
 
 class HTDrawable : public SkCanvasDrawable {
     SkRect          fR;
     SkColor         fColor;
     SkInterpolator* fInterp;
+    SkMSec          fTime;
 
 public:
     HTDrawable(SkRandom& rand) {
         fR = SkRect::MakeXYWH(rand.nextRangeF(0, 640), rand.nextRangeF(0, 480),
                               rand.nextRangeF(20, 200), rand.nextRangeF(20, 200));
         fColor = rand_opaque_color(rand.nextU());
         fInterp = NULL;
+        fTime = 0;
     }
     
-    void spawnAnimation() {
+    void spawnAnimation(SkMSec now) {
+        this->setTime(now);
+
         SkDELETE(fInterp);
         fInterp = SkNEW_ARGS(SkInterpolator, (5, 3));
         SkScalar values[5];
         color_to_floats(fColor, values); values[4] = 0;
-        fInterp->setKeyFrame(0, SampleCode::GetAnimTime(), values);
+        fInterp->setKeyFrame(0, now, values);
         values[0] = 0; values[4] = 180;
-        fInterp->setKeyFrame(1, SampleCode::GetAnimTime() + 1000, values);
+        fInterp->setKeyFrame(1, now + 1000, values);
         color_to_floats(rand_opaque_color(fColor), values); values[4] = 360;
-        fInterp->setKeyFrame(2, SampleCode::GetAnimTime() + 2000, values);
+        fInterp->setKeyFrame(2, now + 2000, values);
 
         fInterp->setMirror(true);
         fInterp->setRepeatCount(3);
 
         this->notifyDrawingChanged();
     }
 
     bool hitTest(SkScalar x, SkScalar y) {
         return oval_contains(fR, x, y);
     }
 
+    void setTime(SkMSec time) { fTime = time; }
+
     void onDraw(SkCanvas* canvas) SK_OVERRIDE {
         SkAutoCanvasRestore acr(canvas, false);
 
         SkPaint paint;
         paint.setAntiAlias(true);
 
         if (fInterp) {
             SkScalar values[5];
-            SkInterpolator::Result res = fInterp->timeToValues(SampleCode::GetAnimTime(), values);
+            SkInterpolator::Result res = fInterp->timeToValues(fTime, values);
             fColor = floats_to_color(values);
 
             canvas->save();
             canvas->translate(fR.centerX(), fR.centerY());
             canvas->rotate(values[4]);
             canvas->translate(-fR.centerX(), -fR.centerY());
 
             switch (res) {
                 case SkInterpolator::kFreezeEnd_Result:
                     SkDELETE(fInterp);
                     fInterp = NULL;
                     break;
                 default:
                     break;
             }
         }
         paint.setColor(fColor);
         canvas->drawRect(fR, paint);
     }
-    
+
     SkRect onGetBounds() SK_OVERRIDE { return fR; }
 };
 
 class HTView : public SampleView {
 public:
     enum {
         N = 50,
         W = 640,
         H = 480,
     };
     
     struct Rec {
         HTDrawable* fDrawable;
     };
     Rec fArray[N];
     SkAutoTUnref<SkCanvasDrawable> fRoot;
+    SkMSec fTime;
     
     HTView() {
         SkRandom rand;
 
         SkPictureRecorder recorder;
         SkCanvas* canvas = recorder.beginRecording(SkRect::MakeWH(W, H));
         for (int i = 0; i < N; ++i) {
             fArray[i].fDrawable = new HTDrawable(rand);
             canvas->EXPERIMENTAL_drawDrawable(fArray[i].fDrawable);
             fArray[i].fDrawable->unref();
         }
         fRoot.reset(recorder.EXPERIMENTAL_endRecordingAsDrawable());
     }
 
 protected:
     bool onQuery(SkEvent* evt) SK_OVERRIDE {
         if (SampleCode::TitleQ(*evt)) {
             SampleCode::TitleR(evt, "HT");
             return true;
         }
         return this->INHERITED::onQuery(evt);
     }
 
     void onDrawContent(SkCanvas* canvas) SK_OVERRIDE {
         canvas->EXPERIMENTAL_drawDrawable(fRoot);
-        this->inval(NULL);
+    }
+
+    bool onAnimatePulse(SkMSec curr, SkMSec prev) SK_OVERRIDE {
+        fTime = curr;
+        for (int i = 0; i < N; ++i) {
+            fArray[i].fDrawable->setTime(fTime);
+        }
+        return true;
     }
 
     SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned modi) SK_OVERRIDE {
         // search backwards to find the top-most
         for (int i = N - 1; i >= 0; --i) {
             if (fArray[i].fDrawable->hitTest(x, y)) {
-                fArray[i].fDrawable->spawnAnimation();
+                fArray[i].fDrawable->spawnAnimation(fTime);
                 break;
             }
         }
         this->inval(NULL);
         return NULL;
     }
 
 private:
     typedef SampleView INHERITED;
 };
 
 //////////////////////////////////////////////////////////////////////////////
 
 static SkView* MyFactory() { return new HTView; }
 static SkViewRegister reg(MyFactory);