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 REG_FIDDLE(Canvas_drawTextRSXform, 256, 256, false, 0) {
draw(SkCanvas * canvas)5 void draw(SkCanvas* canvas) {
6 const int iterations = 26;
7 SkRSXform transforms[iterations];
8 char alphabet[iterations];
9 SkScalar angle = 0;
10 SkScalar scale = 1;
11 for (size_t i = 0; i < std::size(transforms); ++i) {
12 const SkScalar s = SkScalarSin(angle) * scale;
13 const SkScalar c = SkScalarCos(angle) * scale;
14 transforms[i] = SkRSXform::Make(-c, -s, -s * 16, c * 16);
15 angle += .45f;
16 scale += .2f;
17 alphabet[i] = 'A' + i;
18 }
19 SkPaint paint;
20 SkFont font(fontMgr->matchFamilyStyle(nullptr, {}), 20);
21 auto spiral = SkTextBlob::MakeFromRSXform(alphabet, sizeof(alphabet), transforms, font);
22 canvas->drawTextBlob(spiral, 110, 138, paint);
23 }
24 } // END FIDDLE
25