1cb93a386Sopenharmony_ci// Copyright 2020 Google LLC. 2cb93a386Sopenharmony_ci// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. 3cb93a386Sopenharmony_ci#include "tools/fiddle/examples.h" 4cb93a386Sopenharmony_ciREG_FIDDLE_ANIMATED(pong, 256, 256, false, 0, 10) { 5cb93a386Sopenharmony_cistatic SkScalar PingPong(double t, SkScalar period, SkScalar phase, 6cb93a386Sopenharmony_ci SkScalar ends, SkScalar mid) { 7cb93a386Sopenharmony_ci double value = ::fmod(t + phase, period); 8cb93a386Sopenharmony_ci double half = period / 2.0; 9cb93a386Sopenharmony_ci double diff = ::fabs(value - half); 10cb93a386Sopenharmony_ci return SkDoubleToScalar(ends + (1.0 - diff / half) * (mid - ends)); 11cb93a386Sopenharmony_ci} 12cb93a386Sopenharmony_ci 13cb93a386Sopenharmony_civoid draw(SkCanvas* canvas) { 14cb93a386Sopenharmony_ci canvas->clear(SK_ColorBLACK); 15cb93a386Sopenharmony_ci float ballX = PingPong(frame * duration, 2.5f, 0.0f, 0.0f, 1.0f); 16cb93a386Sopenharmony_ci float ballY = PingPong(frame * duration, 2.0f, 0.4f, 0.0f, 1.0f); 17cb93a386Sopenharmony_ci 18cb93a386Sopenharmony_ci SkPaint p; 19cb93a386Sopenharmony_ci p.setColor(SK_ColorWHITE); 20cb93a386Sopenharmony_ci p.setAntiAlias(true); 21cb93a386Sopenharmony_ci 22cb93a386Sopenharmony_ci float bX = ballX * 472 + 20; 23cb93a386Sopenharmony_ci float bY = ballY * 200 + 28; 24cb93a386Sopenharmony_ci 25cb93a386Sopenharmony_ci if (canvas->recordingContext()) { 26cb93a386Sopenharmony_ci canvas->drawRect(SkRect::MakeXYWH(236, bY - 15, 10, 30), p); 27cb93a386Sopenharmony_ci bX -= 256; 28cb93a386Sopenharmony_ci } else { 29cb93a386Sopenharmony_ci canvas->drawRect(SkRect::MakeXYWH(10, bY - 15, 10, 30), p); 30cb93a386Sopenharmony_ci } 31cb93a386Sopenharmony_ci canvas->drawCircle(bX, bY, 5, p); 32cb93a386Sopenharmony_ci} 33cb93a386Sopenharmony_ci} // END FIDDLE 34