1// Copyright 2019 Google LLC.
2// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
3#include "tools/fiddle/examples.h"
4// HASH=935c8f8b9782d297a73d7186f6ef7945
5REG_FIDDLE(Canvas_drawTextRSXform, 256, 256, false, 0) {
6void draw(SkCanvas* canvas) {
7    const int iterations = 26;
8    SkRSXform transforms[iterations];
9    char alphabet[iterations];
10    SkScalar angle = 0;
11    SkScalar scale = 1;
12    for (size_t i = 0; i < SK_ARRAY_COUNT(transforms); ++i) {
13        const SkScalar s = SkScalarSin(angle) * scale;
14        const SkScalar c = SkScalarCos(angle) * scale;
15        transforms[i] = SkRSXform::Make(-c, -s, -s * 16, c * 16);
16        angle += .45f;
17        scale += .2f;
18        alphabet[i] = 'A' + i;
19    }
20    SkPaint paint;
21    SkFont font(nullptr, 20);
22    auto spiral = SkTextBlob::MakeFromRSXform(alphabet, sizeof(alphabet), transforms, font);
23    canvas->drawTextBlob(spiral, 110, 138, paint);
24}
25}  // END FIDDLE
26