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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 "ui/gfx/geometry/three_point_cubic_bezier.h"
#include <algorithm>
#include <cmath>
#include <limits>
#include "base/check_op.h"
namespace gfx {
ThreePointCubicBezier::ThreePointCubicBezier(double p1x,
double p1y,
double p2x,
double p2y,
double midpointx,
double midpointy,
double p3x,
double p3y,
double p4x,
double p4y)
: first_curve_(p1x / midpointx,
p1y / midpointy,
p2x / midpointx,
p2y / midpointy),
second_curve_((p3x - midpointx) / (1 - midpointx),
(p3y - midpointy) / (1 - midpointy),
(p4x - midpointx) / (1 - midpointx),
(p4y - midpointy) / (1 - midpointy)),
midpointx_(midpointx),
midpointy_(midpointy) {}
ThreePointCubicBezier::ThreePointCubicBezier(
const ThreePointCubicBezier& other) = default;
double ThreePointCubicBezier::Solve(double x) const {
const bool in_first_curve = x < midpointx_;
const double scaled_x = (x - (in_first_curve ? 0.0 : midpointx_)) /
(in_first_curve ? midpointx_ : (1 - midpointx_));
if (in_first_curve) {
return first_curve_.Solve(scaled_x) * midpointy_;
}
return second_curve_.Solve(scaled_x) * (1 - midpointy_) + midpointy_;
}
} // namespace gfx
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