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(pong2, 512, 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 float bX = PingPong(frame * duration, 2.5f, 0.0f, 0, 1) * 472 + 20; 15cb93a386Sopenharmony_ci float bY = PingPong(frame * duration, 2.0f, 0.4f, 0, 1) * 200 + 28; 16cb93a386Sopenharmony_ci 17cb93a386Sopenharmony_ci SkPaint p; 18cb93a386Sopenharmony_ci p.setColor(SK_ColorWHITE); 19cb93a386Sopenharmony_ci p.setAntiAlias(true); 20cb93a386Sopenharmony_ci 21cb93a386Sopenharmony_ci canvas->clear(SK_ColorBLACK); 22cb93a386Sopenharmony_ci canvas->drawRect(SkRect::MakeXYWH(492, bY - 15, 10, 30), p); 23cb93a386Sopenharmony_ci canvas->drawRect(SkRect::MakeXYWH(10, bY - 15, 10, 30), p); 24cb93a386Sopenharmony_ci canvas->drawCircle(bX, bY, 5, p); 25cb93a386Sopenharmony_ci 26cb93a386Sopenharmony_ci const float intervals[] = { 12, 6 }; 27cb93a386Sopenharmony_ci p.setStrokeWidth(5); 28cb93a386Sopenharmony_ci p.setPathEffect(SkDashPathEffect::Make(intervals, SK_ARRAY_COUNT(intervals), 0)); 29cb93a386Sopenharmony_ci canvas->drawLine({256,0}, {256, 256}, p); 30cb93a386Sopenharmony_ci} 31cb93a386Sopenharmony_ci} // END FIDDLE 32