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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/ui/views/dotted_icon.h"
#include "cc/paint/paint_flags.h"
#include "third_party/skia/include/core/SkPath.h"
#include "ui/gfx/animation/tween.h"
#include "ui/gfx/canvas.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/gfx/geometry/skia_conversions.h"
namespace {
// Ring Segments
constexpr int kNumSmallSegments = 4;
constexpr int kNumSpacingSegments = kNumSmallSegments + 1;
constexpr int kLargeSegmentSweepAngle = 160;
// Split the remaining space in half so that half is allocated for the small
// segment of the ring and the other half is for the spacing between segments
constexpr int kAllocatedSpace = (360 - kLargeSegmentSweepAngle) / 2;
constexpr int kSpacingSweepAngle = kAllocatedSpace / kNumSpacingSegments;
constexpr int kSmallSegmentSweepAngle = kAllocatedSpace / kNumSmallSegments;
// Paints arc starting at `start_angle` with a `sweep` in degrees.
// A starting angle of 0 means that the arc starts on the right side of `bounds`
// and continues drawing the arc in a clockwise direction for `sweep` degrees
void PaintArc(gfx::Canvas* canvas,
const gfx::Rect& bounds,
const SkScalar start_angle,
const SkScalar sweep,
const cc::PaintFlags& flags,
float stroke_width) {
CHECK_GT(stroke_width, 0);
gfx::RectF oval(bounds);
// Inset by half the stroke width to make sure the whole arc is inside
// the visible rect.
const double inset = stroke_width / 2.0;
oval.Inset(inset);
SkPath path;
path.arcTo(RectFToSkRect(oval), start_angle, sweep, true);
canvas->DrawPath(path, flags);
}
} // namespace
void PaintRingDottedPath(gfx::Canvas* canvas,
const gfx::Rect& ring_bounds,
SkColor ring_color,
double opacity_ratio,
float stroke_width) {
opacity_ratio = std::clamp(opacity_ratio, 0.0, 1.0);
// Common flags for both parts of the ring.
cc::PaintFlags flags;
flags.setColor(ring_color);
flags.setStrokeCap(cc::PaintFlags::kRound_Cap);
flags.setStrokeWidth(stroke_width);
flags.setStyle(cc::PaintFlags::kStroke_Style);
flags.setAntiAlias(true);
const float ring_color_opacity =
static_cast<float>(SkColorGetA(ring_color)) / SK_AlphaOPAQUE;
flags.setAlphaf(static_cast<float>(
gfx::Tween::CalculateValue(gfx::Tween::EASE_IN, opacity_ratio) *
ring_color_opacity));
// Draw the large segment centered on the left side.
const int large_segment_start_angle = 180 - kLargeSegmentSweepAngle / 2;
PaintArc(canvas, ring_bounds, large_segment_start_angle,
kLargeSegmentSweepAngle, flags, stroke_width);
// Draw the small segments evenly spaced around the rest of the ring.
const int small_segments_start_angle =
180 + (kLargeSegmentSweepAngle / 2) + kSpacingSweepAngle;
for (int i = 0; i < kNumSmallSegments; i++) {
const int start_angle =
small_segments_start_angle +
(i * (kSmallSegmentSweepAngle + kSpacingSweepAngle));
PaintArc(canvas, ring_bounds, start_angle % 360, kSmallSegmentSweepAngle,
flags, stroke_width);
}
}
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