blob: ca297c9f1ae2a6505fc4fc464586fad98e349e99 [file] [log] [blame]
// Copyright 2020 Google LLC.
// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
#include "tools/fiddle/examples.h"
REG_FIDDLE_ANIMATED(pong, 256, 256, false, 0, 10) {
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);
}
} // END FIDDLE