skia2/docs/examples/example3ps.cpp
Hal Canary 6c8422c671 add more docs/examples from named fiddles.
ignore offscreen, srgb, and animated fiddles for now.

Change-Id: I923131b684865698e6cda138b004930e11f504d5
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/263713
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Ben Wagner <bungeman@google.com>
2020-01-14 19:22:26 +00:00

110 lines
3.0 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(example3ps, 320, 256, false, 0) {
static SkMatrix setpsmatrix(float sx, float kx, float ky, float sy, float tx, float ty, int h) {
SkMatrix m;
m.setAll(sx, -kx, -tx * sx - (ty - h) * kx, -ky, sy, (ty - h) * sy + tx * ky, 0, 0, 1);
return m;
}
void draw(SkCanvas* canvas) {
canvas->save();
canvas->scale(15, -15);
canvas->translate(0, -28);
SkPath path;
path.moveTo(2, 2);
path.lineTo(3, 3);
path.lineTo(3, 4);
path.lineTo(2, 4);
path.lineTo(1, 5);
path.close();
SkPaint p;
p.setAntiAlias(true);
p.setStrokeWidth(0.1f);
canvas->save();
canvas->translate(0, 18);
p.setColor(SK_ColorGRAY);
canvas->drawPath(path, p);
canvas->restore();
p.setStyle(SkPaint::kStroke_Style);
canvas->save();
canvas->translate(8, 19);
canvas->rotate(90);
p.setColor(SK_ColorRED);
canvas->drawPath(path, p);
canvas->restore();
canvas->save();
canvas->translate(5, 23);
canvas->rotate(-90);
p.setColor(SK_ColorBLUE);
canvas->drawPath(path, p);
canvas->restore();
canvas->save();
canvas->translate(14, 18);
canvas->scale(-1, 1);
p.setColor(0xFF007F00);
canvas->drawPath(path, p);
canvas->restore();
canvas->restore();
canvas->scale(15, 15);
canvas->translate(0, 24);
SkMatrix m;
unsigned char d[] = {0x00, 0x00, 0x00, 0x00, 0xff, 0xff};
sk_sp<SkData> data = SkData::MakeWithoutCopy((unsigned char*)d, sizeof(d));
SkImageInfo info =
SkImageInfo::Make(3, 2, SkColorType::kGray_8_SkColorType, kOpaque_SkAlphaType);
sk_sp<SkImage> image = SkImage::MakeRasterData(info, data, 3);
SkPaint bp;
canvas->save();
m = setpsmatrix(1, 0, 0, 1, -1, -24, 2);
// m.setAll(1, 0, -1, 0, 1, -24, 0, 0, 1);
canvas->concat(m);
canvas->drawImage(image, 0, 0, &bp);
canvas->restore();
canvas->save();
m = setpsmatrix(0, 1, 1, 0, -24, -5, 2);
// m.setAll(0, -1, 5, -1, 0, -22, 0, 0, 1);
canvas->concat(m);
canvas->drawImage(image, 0, 0, &bp);
canvas->restore();
canvas->save();
m = setpsmatrix(0, 1, -1, 0, 27, -8, 2);
// m.setAll(0, -1, 8, 1, 0, -25, 0, 0, 1);
canvas->concat(m);
canvas->drawImage(image, 0, 0, &bp);
canvas->restore();
canvas->save();
m = setpsmatrix(0, -1, -1, 0, -24, 13, 2);
// m.setAll(0, 1, 9, -1, 0, -22, 0, 0, 1);
canvas->concat(m);
canvas->drawImage(image, 0, 0, &bp);
canvas->restore();
canvas->save();
m = setpsmatrix(-1, 0, 0, -1, 17, 26, 2);
// m.setAll(-1, 0, 15, 0, -1, -22, 0, 0, 1);
canvas->concat(m);
canvas->drawImage(image, 0, 0, &bp);
canvas->restore();
canvas->save();
m = setpsmatrix(-1, 0, 0, 1, 21, -24, 2);
// m.setAll(-1, 0, 19, 0, 1, -24, 0, 0, 1);
canvas->concat(m);
canvas->drawImage(image, 0, 0, &bp);
canvas->restore();
}
} // END FIDDLE