skia2/docs/examples/Matrix_fixedStepInX.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

29 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=fad6b92b21b1e1deeae61978cec2d232
REG_FIDDLE(Matrix_fixedStepInX, 256, 256, false, 3) {
void draw(SkCanvas* canvas) {
SkMatrix matrix;
const SkPoint center = { 128, 128 };
matrix.setScale(20, 25, center.fX, center.fY);
matrix.postRotate(75, center.fX, center.fY);
{
SkAutoCanvasRestore acr(canvas, true);
canvas->concat(matrix);
canvas->drawBitmap(source, 0, 0);
}
if (matrix.isFixedStepInX()) {
SkPaint paint;
paint.setAntiAlias(true);
SkVector step = matrix.fixedStepInX(128);
SkVector end = center + step;
canvas->drawLine(center, end, paint);
SkVector arrow = { step.fX + step.fY, step.fY - step.fX};
arrow = arrow * .25f;
canvas->drawLine(end, end - arrow, paint);
canvas->drawLine(end, {end.fX + arrow.fY, end.fY - arrow.fX}, paint);
}
}
} // END FIDDLE