Skia Fiddle

Options

Width Height

check_box_outline_blank check_box Text Only [Use SkDebugf()]

check_box_outline_blank check_box sRGB

check_box_outline_blank check_box F16

check_box_outline_blank check_box Animation

Duration (seconds)

These globals are now defined:

double duration; // The requested duration of the animation.
double frame;    // A value in [0, 1] of where we are in the animation.

check_box_outline_blank check_box Offscreen Render Target

Width Height Sample Count

check_box_outline_blank check_box Texturable

check_box_outline_blank check_box MipMap

This global is now defined:

GrBackendRenderTarget backEndRenderTarget;

GrBackendTexture backEndTextureRenderTarget;

Optional source image

check_box_outline_blank check_box MipMap

These globals are now defined:

SkBitmap source;
sk_sp<SkImage> image;
GrBackendTexture backEndTexture; // GPU Only.

Note:

Adding comments with SK_FOLD_START and SK_FOLD_END creates foldable code blocks.
These blocks will be folded by default and are useful for highlighting specific lines of code.
You can also use the keyboard shortcuts Ctrl+S and Ctrl+E in the code editor to set them.

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static SkScalar PingPong(double t, SkScalar period, SkScalar phase,
                         SkScalar ends, SkScalar mid) {
  double value = ::fmod(t + phase, period);
  double half = period / 2.0;
  double diff = ::fabs(value - half);
  return SkDoubleToScalar(ends + (1.0 - diff / half) * (mid - ends));
}
​
void draw(SkCanvas* canvas) {
  canvas->clear(SK_ColorBLACK);
  float ballX = PingPong(frame * duration, 2.5f, 0.0f, 0.0f, 1.0f);
  float ballY = PingPong(frame * duration, 2.0f, 0.4f, 0.0f, 1.0f);
​
  SkPaint p;
  p.setColor(SK_ColorWHITE);
  p.setAntiAlias(true);
​
  float bX = ballX * 472 + 20;
  float bY = ballY * 200 + 28;
​
  if (canvas->recordingContext()) {
    canvas->drawRect(SkRect::MakeXYWH(236, bY - 15, 10, 30), p);
    bX -= 256;
  } else {
    canvas->drawRect(SkRect::MakeXYWH(10, bY - 15, 10, 30), p);
  }
  canvas->drawCircle(bX, bY, 5, p);
}