Implement touch control

tools/viewer/Viewer.cpp

 /*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #include "Viewer.h"
 
 #include "GMSlide.h"
@@ skipping 206 matching lines @@
         //m = this->getLocalMatrix();//.invert(&m);
         m.mapXY(fZoomCenterX, fZoomCenterY, &center);
         SkScalar cx = center.fX;
         SkScalar cy = center.fY;
 
         m.setTranslate(-cx, -cy);
         m.postScale(fZoomScale, fZoomScale);
         m.postTranslate(cx, cy);
     }
 
-    // TODO: add gesture support
-    // Apply any gesture matrix
-    //m.preConcat(fGesture.localM());
-    //m.preConcat(fGesture.globalM());
+    m.preConcat(fWindow->getGestureLocalM());
+    m.preConcat(fWindow->getGestureGlobalM());
 
     fLocalMatrix = m;
 }
 
 void Viewer::onPaint(SkCanvas* canvas) {
 
     int count = canvas->save();
 
     if (fWindow->supportsContentRect()) {
         SkRect contentRect = fWindow->getContentRect();
@@ skipping 12 matching lines @@
     }
     canvas->concat(fLocalMatrix);
 
     fSlides[fCurrentSlide]->draw(canvas);
     canvas->restoreToCount(count);
 
     if (fDisplayStats) {
         drawStats(canvas);
     }
     fCommands.drawHelp(canvas);
+
+    updateMatrix();

[djsollen, 2016/05/16 18:16:00]

comment why we need to update the matrix after we paint.

[liyuqian, 2016/05/16 18:32:37]

Done.

 }
 
 void Viewer::drawStats(SkCanvas* canvas) {
     static const float kPixelPerMS = 2.0f;
     static const int kDisplayWidth = 130;
     static const int kDisplayHeight = 100;
     static const int kDisplayPadding = 10;
     static const int kGraphPadding = 3;
     static const SkScalar kBaseMS = 1000.f / 60.f;  // ms/frame to hit 60 fps
 
@@ skipping 41 matching lines @@
     // Record measurements
     fMeasurements[fCurrentMeasurement++] = ms;
     fCurrentMeasurement &= (kMeasurementCount - 1);  // fast mod
     SkASSERT(fCurrentMeasurement < kMeasurementCount);
 
     fAnimTimer.updateTime();
     if (fSlides[fCurrentSlide]->animate(fAnimTimer) || fDisplayStats) {
         fWindow->inval();
     }
 }