skia2/docs/examples/Matrix_invert.cpp
Mike Klein c0bd9f9fe5 rewrite includes to not need so much -Ifoo
Current strategy: everything from the top

Things to look at first are the manual changes:

   - added tools/rewrite_includes.py
   - removed -Idirectives from BUILD.gn
   - various compile.sh simplifications
   - tweak tools/embed_resources.py
   - update gn/find_headers.py to write paths from the top
   - update gn/gn_to_bp.py SkUserConfig.h layout
     so that #include "include/config/SkUserConfig.h" always
     gets the header we want.

No-Presubmit: true
Change-Id: I73a4b181654e0e38d229bc456c0d0854bae3363e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/209706
Commit-Queue: Mike Klein <mtklein@google.com>
Reviewed-by: Hal Canary <halcanary@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Florin Malita <fmalita@chromium.org>
2019-04-24 16:27:11 +00:00

25 lines
1.0 KiB
C++

// Copyright 2019 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"
// HASH=0e03cd9f154603ed4b21ca56d69dae44
REG_FIDDLE(Matrix_invert, 256, 128, false, 0) {
void draw(SkCanvas* canvas) {
const SkPoint src[] = { { 10, 120}, {120, 120}, {120, 10}, { 10, 10} };
const SkPoint dst[] = { {150, 120}, {200, 100}, {240, 30}, { 130, 40} };
SkPaint paint;
paint.setAntiAlias(true);
SkMatrix matrix;
matrix.setPolyToPoly(src, dst, 4);
canvas->drawPoints(SkCanvas::kPolygon_PointMode, 4, src, paint);
canvas->drawPoints(SkCanvas::kPolygon_PointMode, 4, dst, paint);
paint.setColor(SK_ColorBLUE);
paint.setStrokeWidth(3);
paint.setStrokeCap(SkPaint::kRound_Cap);
canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, dst, paint);
if (matrix.invert(&matrix)) {
canvas->concat(matrix);
canvas->drawPoints(SkCanvas::kPoints_PointMode, 4, dst, paint);
}
}
} // END FIDDLE