209 lines
6.5 KiB
C++
209 lines
6.5 KiB
C++
/*
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* Copyright 2017 Google Inc.
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*
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* Use of this source code is governed by a BSD-style license that can be
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* found in the LICENSE file.
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*/
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#include "gm/gm.h"
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#include "include/core/SkCanvas.h"
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#include "include/core/SkPaint.h"
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#include "include/core/SkPath.h"
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#include "include/core/SkScalar.h"
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namespace {
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// Test thin stroked rect (stroked "by hand", not by stroking).
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void draw_thin_stroked_rect(SkCanvas* canvas, const SkPaint& paint, SkScalar width) {
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SkPath path;
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path.moveTo(10 + width, 10 + width);
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path.lineTo(40, 10 + width);
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path.lineTo(40, 20);
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path.lineTo(10 + width, 20);
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path.moveTo(10, 10);
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path.lineTo(10, 20 + width);
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path.lineTo(40 + width, 20 + width);
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path.lineTo(40 + width, 10);
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canvas->drawPath(path, paint);
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}
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void draw_thin_right_angle(SkCanvas* canvas, const SkPaint& paint, SkScalar width) {
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SkPath path;
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path.moveTo(10 + width, 10 + width);
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path.lineTo(40, 10 + width);
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path.lineTo(40, 20);
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path.lineTo(40 + width, 20 + width);
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path.lineTo(40 + width, 10);
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path.lineTo(10, 10);
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canvas->drawPath(path, paint);
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}
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// Test thin horizontal line (<1 pixel) which should give lower alpha.
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void draw_golf_club(SkCanvas* canvas, const SkPaint& paint, SkScalar width) {
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SkPath path;
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path.moveTo(20, 10);
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path.lineTo(80, 10);
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path.lineTo(80, 10 + width);
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path.lineTo(30, 10 + width);
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path.lineTo(30, 20);
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path.lineTo(20, 20);
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canvas->drawPath(path, paint);
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}
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// Test thin lines between two filled regions. The outer edges overlap, but
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// there are no inverted edges to fix.
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void draw_barbell(SkCanvas* canvas, const SkPaint& paint, SkScalar width) {
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SkScalar offset = width * 0.5f;
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SkPath path;
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path.moveTo(30, 5);
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path.lineTo(40 - offset, 15 - offset);
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path.lineTo(60 + offset, 15 - offset);
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path.lineTo(70, 5);
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path.lineTo(70, 25);
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path.lineTo(60 + offset, 15 + offset);
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path.lineTo(40 - offset, 15 + offset);
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path.lineTo(30, 25);
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canvas->drawPath(path, paint);
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}
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// Test a thin rectangle and triangle. The top and bottom inner edges of the
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// rectangle and all inner edges of the triangle invert on stroking.
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void draw_thin_rect_and_triangle(SkCanvas* canvas, const SkPaint& paint, SkScalar width) {
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SkPath path;
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path.moveTo(30, 5);
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path.lineTo(30 + width, 5);
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path.lineTo(30 + width, 25);
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path.lineTo(30, 25);
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path.moveTo(40, 5);
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path.lineTo(40 + width, 5);
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path.lineTo(40, 25);
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canvas->drawPath(path, paint);
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}
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// Two triangles joined by a very thin bridge. The tiny triangle formed
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// by the inner edges at the bridge is inverted.
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// (These are actually now more phat pants than hipster pants.)
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void draw_hipster_pants(SkCanvas* canvas, const SkPaint& paint, SkScalar width) {
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SkPath path;
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path.moveTo(10, 10);
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path.lineTo(10, 20);
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path.lineTo(50, 10 + width);
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path.lineTo(90, 20);
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path.lineTo(90, 10);
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canvas->drawPath(path, paint);
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}
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// A thin z-shape whose interior inverts on stroking. The top and bottom inner edges invert, and
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// the connector edges at the "elbows" intersect the inner edges.
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void draw_skinny_snake(SkCanvas* canvas, const SkPaint& paint, SkScalar width) {
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SkPath path;
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path.moveTo(20 + width, 10);
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path.lineTo(20 + width, 20);
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path.lineTo(10 + width, 30);
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path.lineTo(10 + width, 40);
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path.lineTo(10 - width, 40);
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path.lineTo(10 - width, 30);
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path.lineTo(20 - width, 20);
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path.lineTo(20 - width, 10);
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canvas->drawPath(path, paint);
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}
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// Test pointy features whose outer edges extend far to the right on stroking.
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void draw_pointy_golf_club(SkCanvas* canvas, const SkPaint& paint, SkScalar width) {
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SkPath path;
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path.moveTo(20, 10);
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path.lineTo(80, 10 + width * 0.5);
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path.lineTo(30, 10 + width);
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path.lineTo(30, 20);
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path.lineTo(20, 20);
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canvas->drawPath(path, paint);
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}
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void draw_small_i(SkCanvas* canvas, const SkPaint& paint, SkScalar width) {
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SkPath path;
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path.moveTo(1.25 - width, 18.75 + width);
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path.lineTo(1.25 - width, 12.25 - width);
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path.lineTo(2.50 + width, 12.25 - width);
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path.lineTo(2.50 + width, 18.75 + width);
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path.moveTo(1.25 - width, 11.75 + width);
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path.lineTo(1.25 - width, 10.25 - width);
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path.lineTo(2.50 + width, 10.25 - width);
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path.lineTo(2.50 + width, 11.75 + width);
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canvas->drawPath(path, paint);
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}
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} // namespace
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DEF_SIMPLE_GM(thinconcavepaths, canvas, 550, 400) {
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SkPaint paint;
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paint.setAntiAlias(true);
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paint.setStyle(SkPaint::kFill_Style);
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canvas->save();
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for (SkScalar width = 0.5f; width < 2.05f; width += 0.25f) {
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draw_thin_stroked_rect(canvas, paint, width);
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canvas->translate(0, 25);
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}
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canvas->restore();
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canvas->translate(50, 0);
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canvas->save();
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for (SkScalar width = 0.5f; width < 2.05f; width += 0.25f) {
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draw_thin_right_angle(canvas, paint, width);
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canvas->translate(0, 25);
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}
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canvas->restore();
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canvas->translate(40, 0);
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canvas->save();
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for (SkScalar width = 0.2f; width < 2.1f; width += 0.2f) {
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draw_golf_club(canvas, paint, width);
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canvas->translate(0, 30);
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}
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canvas->restore();
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canvas->translate(70, 0);
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canvas->save();
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for (SkScalar width = 0.2f; width < 2.1f; width += 0.2f) {
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draw_thin_rect_and_triangle(canvas, paint, width);
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canvas->translate(0, 30);
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}
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canvas->restore();
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canvas->translate(30, 0);
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canvas->save();
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for (SkScalar width = 0.2f; width < 2.1f; width += 0.2f) {
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draw_barbell(canvas, paint, width);
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canvas->translate(0, 30);
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}
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canvas->restore();
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canvas->translate(80, 0);
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canvas->save();
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for (SkScalar width = 0.2f; width < 2.1f; width += 0.2f) {
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draw_hipster_pants(canvas, paint, width);
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canvas->translate(0, 30);
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}
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canvas->restore();
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canvas->translate(100, 0);
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canvas->save();
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for (SkScalar width = 0.2f; width < 2.1f; width += 0.2f) {
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draw_skinny_snake(canvas, paint, width);
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canvas->translate(0, 30);
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}
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canvas->restore();
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canvas->translate(30, 0);
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canvas->save();
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for (SkScalar width = 0.2f; width < 2.1f; width += 0.2f) {
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draw_pointy_golf_club(canvas, paint, width);
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canvas->translate(0, 30);
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}
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canvas->restore();
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canvas->translate(100, 0);
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canvas->save();
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for (SkScalar width = 0.0f; width < 0.5f; width += 0.05f) {
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draw_small_i(canvas, paint, width);
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canvas->translate(0, 30);
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}
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canvas->restore();
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canvas->translate(100, 0);
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}
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