You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
32 lines
1.1 KiB
32 lines
1.1 KiB
// 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(pong2, 512, 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) {
|
|
float bX = PingPong(frame * duration, 2.5f, 0.0f, 0, 1) * 472 + 20;
|
|
float bY = PingPong(frame * duration, 2.0f, 0.4f, 0, 1) * 200 + 28;
|
|
|
|
SkPaint p;
|
|
p.setColor(SK_ColorWHITE);
|
|
p.setAntiAlias(true);
|
|
|
|
canvas->clear(SK_ColorBLACK);
|
|
canvas->drawRect(SkRect::MakeXYWH(492, bY - 15, 10, 30), p);
|
|
canvas->drawRect(SkRect::MakeXYWH(10, bY - 15, 10, 30), p);
|
|
canvas->drawCircle(bX, bY, 5, p);
|
|
|
|
const float intervals[] = { 12, 6 };
|
|
p.setStrokeWidth(5);
|
|
p.setPathEffect(SkDashPathEffect::Make(intervals, SK_ARRAY_COUNT(intervals), 0));
|
|
canvas->drawLine({256,0}, {256, 256}, p);
|
|
}
|
|
} // END FIDDLE
|