skia2/docs/examples/ChromeMDRefreshTabs.cpp

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// Copyright 2020 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"
REG_FIDDLE(ChromeMDRefreshTabs, 256, 256, false, 0) {
SkPath GetInteriorPath(
float scale, const SkISize& size, float endcap_width, float horizontal_inset = 0) {
const float right = size.fWidth * scale;
// The bottom of the tab needs to be pixel-aligned or else when we call
// ClipPath with anti-aliasing enabled it can cause artifacts.
const float bottom = std::ceil(size.fHeight * scale);
// const float scaled_horizontal_inset = horizontal_inset * scale;
const float endcap_radius = endcap_width / 2;
// Construct the interior path by intersecting paths representing the left
// and right halves of the tab. Compared to computing the full path at once,
// this makes it easier to avoid overdraw in the top center near minimum
// width, and to implement cases where |horizontal_inset| != 0.
SkPath right_path;
right_path.moveTo(right, bottom);
// right_path.moveTo(right - 1 - scaled_horizontal_inset, bottom);
right_path.arcTo(endcap_radius, endcap_radius, 90, SkPath::kSmall_ArcSize,
SkPathDirection::kCW, right - endcap_radius, bottom - endcap_radius);
// right_path.rCubicTo(-0.75 * scale, 0, -1.625 * scale, -0.5 * scale,
// -2 * scale, -1.5 * scale);
right_path.lineTo(right - endcap_radius, endcap_radius);
// right_path.lineTo(
// right - 1 - scaled_horizontal_inset - (endcap_width - 2) * scale,
// 2.5 * scale);
right_path.arcTo(endcap_radius, endcap_radius, 90, SkPath::kSmall_ArcSize,
SkPathDirection::kCCW, right - endcap_width, 0);
// right_path.rCubicTo(-0.375 * scale, -1 * scale, -1.25 * scale, -1.5 * scale,
// -2 * scale, -1.5 * scale);
right_path.lineTo(0, 0);
right_path.lineTo(0, bottom);
right_path.close();
SkPath left_path;
// const float scaled_endcap_width = 1 + endcap_width * scale;
left_path.moveTo(endcap_width, 0);
// left_path.moveTo(scaled_endcap_width + scaled_horizontal_inset, scale);
left_path.arcTo(endcap_radius, endcap_radius, 90, SkPath::kSmall_ArcSize,
SkPathDirection::kCCW, endcap_radius, endcap_radius);
// left_path.rCubicTo(-0.75 * scale, 0, -1.625 * scale, 0.5 * scale, -2 * scale,
// 1.5 * scale);
left_path.lineTo(endcap_radius, bottom - endcap_radius);
// left_path.lineTo(1 + scaled_horizontal_inset + 2 * scale,
// bottom - 1.5 * scale);
left_path.arcTo(endcap_radius, endcap_radius, 90, SkPath::kSmall_ArcSize,
SkPathDirection::kCW, 0, bottom);
// left_path.rCubicTo(-0.375 * scale, scale, -1.25 * scale, 1.5 * scale,
// -2 * scale, 1.5 * scale);
left_path.lineTo(right, bottom);
left_path.lineTo(right, 0);
left_path.close();
SkPath complete_path;
Op(left_path, right_path, SkPathOp::kIntersect_SkPathOp, &complete_path);
return complete_path;
}
void draw(SkCanvas* canvas) {
SkPaint p;
p.setColor(SK_ColorRED);
p.setAntiAlias(true);
p.setStyle(SkPaint::kStroke_Style);
p.setStrokeWidth(1);
SkPath path = GetInteriorPath(1.f, SkISize::Make(250, 36), 16);
canvas->drawPath(path, p);
// canvas->drawLine(20, 20, 100, 100, p);
}
} // END FIDDLE