1cb93a386Sopenharmony_ci// Copyright 2020 Google LLC. 2cb93a386Sopenharmony_ci// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file. 3cb93a386Sopenharmony_ci#include "tools/fiddle/examples.h" 4cb93a386Sopenharmony_ciREG_FIDDLE(mapradius, 256, 256, false, 0) { 5cb93a386Sopenharmony_civoid draw(SkCanvas* canvas) { 6cb93a386Sopenharmony_ci SkPaint paint; 7cb93a386Sopenharmony_ci paint.setAntiAlias(true); 8cb93a386Sopenharmony_ci paint.setStyle(SkPaint::kStroke_Style); 9cb93a386Sopenharmony_ci SkMatrix matrix; 10cb93a386Sopenharmony_ci const SkPoint center = {128, 103}; 11cb93a386Sopenharmony_ci matrix.setScale(2, .5f, center.fX, center.fY); 12cb93a386Sopenharmony_ci matrix.postRotate(45, center.fX, center.fY); 13cb93a386Sopenharmony_ci const SkScalar circleRadius = 60; 14cb93a386Sopenharmony_ci SkScalar mappedRadius = matrix.mapRadius(circleRadius); 15cb93a386Sopenharmony_ci SkVector minorAxis, majorAxis; 16cb93a386Sopenharmony_ci matrix.mapVector(0, circleRadius, &minorAxis); 17cb93a386Sopenharmony_ci matrix.mapVector(circleRadius, 0, &majorAxis); 18cb93a386Sopenharmony_ci paint.setColor(SK_ColorRED); 19cb93a386Sopenharmony_ci canvas->drawLine(40, 240, 40 + minorAxis.length(), 240, paint); 20cb93a386Sopenharmony_ci canvas->drawLine(42 + minorAxis.length(), 240, 42 + minorAxis.length() + majorAxis.length(), 21cb93a386Sopenharmony_ci 240, paint); 22cb93a386Sopenharmony_ci paint.setColor(SK_ColorBLACK); 23cb93a386Sopenharmony_ci canvas->drawLine(center.fX, center.fY, center.fX + mappedRadius, center.fY, paint); 24cb93a386Sopenharmony_ci canvas->drawLine(center.fX, center.fY, center.fX, center.fY + mappedRadius, paint); 25cb93a386Sopenharmony_ci canvas->drawLine(40, 220, 40 + mappedRadius, 220, paint); 26cb93a386Sopenharmony_ci canvas->drawLine(42 + mappedRadius, 220, 42 + mappedRadius * 2, 220, paint); 27cb93a386Sopenharmony_ci canvas->concat(matrix); 28cb93a386Sopenharmony_ci canvas->drawCircle(center.fX, center.fY, circleRadius, paint); 29cb93a386Sopenharmony_ci paint.setColor(SK_ColorRED); 30cb93a386Sopenharmony_ci canvas->drawLine(center.fX, center.fY, center.fX + circleRadius, center.fY, paint); 31cb93a386Sopenharmony_ci canvas->drawLine(center.fX, center.fY, center.fX, center.fY + circleRadius, paint); 32cb93a386Sopenharmony_ci} 33cb93a386Sopenharmony_ci} // END FIDDLE 34