10a5ff2cac
Change-Id: I820867df80daa1594d6202cad5e8e95c060293fe Reviewed-on: https://skia-review.googlesource.com/c/skia/+/386838 Commit-Queue: Mike Reed <reed@google.com> Reviewed-by: Florin Malita <fmalita@chromium.org>
61 lines
2.4 KiB
C++
61 lines
2.4 KiB
C++
// 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(picture_shader, 256, 256, false, 5) {
|
|
static void draw_centered(
|
|
const char* s, const SkFont& font, SkColor color, SkPoint xy, SkCanvas* c) {
|
|
sk_sp<SkTextBlob> b = SkTextBlob::MakeFromString(s, font);
|
|
xy -= SkPoint{b->bounds().centerX(), b->bounds().centerY()};
|
|
SkPaint p;
|
|
p.setColor(color);
|
|
c->drawTextBlob(b.get(), xy.x(), xy.y(), p);
|
|
}
|
|
|
|
SkPoint from_polar_deg(float r, float d) {
|
|
float a = d * 0.017453292519943295;
|
|
return {r * cosf(a), r * sinf(a)};
|
|
}
|
|
|
|
void draw_wheel(SkCanvas* c) {
|
|
const SkScalar scale = 512;
|
|
SkAutoCanvasRestore autoCanvasRestore(c, true);
|
|
c->translate(0.5f * scale, 0.5f * scale);
|
|
SkPaint p;
|
|
p.setAntiAlias(true);
|
|
p.setColor(SK_ColorWHITE);
|
|
c->drawCircle(0.0f, 0.0f, scale * 0.475f, p);
|
|
|
|
const SkColor sweep_colors[] = {SK_ColorRED, SK_ColorYELLOW, SK_ColorGREEN, SK_ColorCYAN,
|
|
SK_ColorBLUE, SK_ColorMAGENTA, SK_ColorRED};
|
|
SkMatrix rot;
|
|
rot.setRotate(90.0f);
|
|
p.setShader(SkGradientShader::MakeSweep(0, 0, sweep_colors, NULL,
|
|
SK_ARRAY_COUNT(sweep_colors), 0, &rot));
|
|
p.setStrokeWidth(0.05f * scale);
|
|
p.setStyle(SkPaint::kStroke_Style);
|
|
c->drawCircle(0.0f, 0.0f, 0.475f * scale, p);
|
|
|
|
SkFont f(nullptr, 0.28125f * scale);
|
|
draw_centered("K", f, SK_ColorBLACK, {0.0f, 0.0f}, c);
|
|
draw_centered("R", f, SK_ColorRED, from_polar_deg(0.3f * scale, 90), c);
|
|
draw_centered("G", f, SK_ColorGREEN, from_polar_deg(0.3f * scale, 210), c);
|
|
draw_centered("B", f, SK_ColorBLUE, from_polar_deg(0.3f * scale, 330), c);
|
|
draw_centered("C", f, SK_ColorCYAN, from_polar_deg(0.3f * scale, 270), c);
|
|
draw_centered("M", f, SK_ColorMAGENTA, from_polar_deg(0.3f * scale, 30), c);
|
|
draw_centered("Y", f, SK_ColorYELLOW, from_polar_deg(0.3f * scale, 150), c);
|
|
}
|
|
|
|
void draw(SkCanvas* canvas) {
|
|
canvas->clear(SK_ColorWHITE);
|
|
SkMatrix matrix;
|
|
matrix.setScale(0.25f, 0.25f);
|
|
matrix.preRotate(30.0f);
|
|
SkPaint paint;
|
|
SkPictureRecorder rec;
|
|
draw_wheel(rec.beginRecording(512, 512));
|
|
paint.setShader(rec.finishRecordingAsPicture()->makeShader(
|
|
SkTileMode::kRepeat, SkTileMode::kRepeat, SkFilterMode::kNearest, &matrix, nullptr));
|
|
canvas->drawPaint(paint);
|
|
}
|
|
} // END FIDDLE
|