// 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