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LibGfx: Add Painter::draw_triangle_wave()

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This patch adds support for drawing triangular waves.
For now those can only be horizontal, but as they are intended for
underlining text, it's an okay way to handle this.
This commit is contained in:
Tobias Christiansen 2022-01-20 19:55:14 +01:00 • committed by Ali Mohammad Pur
parent 7b51102495
commit 0277118cb4
2 changed files with 21 additions and 0 deletions
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20
Userland/Libraries/LibGfx/Painter.cpp
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@ -3,6 +3,7 @@
* Copyright (c) 2021, Idan Horowitz <idan.horowitz@serenityos.org>
* Copyright (c) 2021, Mustafa Quraish <mustafa@serenityos.org>
* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
* Copyright (c) 2022, Tobias Christiansen <tobyase@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -1821,6 +1822,25 @@ void Painter::draw_line(IntPoint const& a_p1, IntPoint const& a_p2, Color color,
}
}
void Painter::draw_triangle_wave(IntPoint const& a_p1, IntPoint const& a_p2, Color color, int amplitude, int thickness)
{
// FIXME: Support more than horizontal waves
VERIFY(a_p1.y() == a_p2.y());
auto const p1 = thickness > 1 ? a_p1.translated(-(thickness / 2), -(thickness / 2)) : a_p1;
auto const p2 = thickness > 1 ? a_p2.translated(-(thickness / 2), -(thickness / 2)) : a_p2;
auto point1 = to_physical(p1);
auto point2 = to_physical(p2);
auto y = point1.y();
for (int x = 0; x <= point2.x() - point1.x(); ++x) {
auto y_offset = abs(x % (2 * amplitude) - amplitude) - amplitude;
draw_physical_pixel({ point1.x() + x, y + y_offset }, color, thickness);
}
}
static bool can_approximate_bezier_curve(FloatPoint const& p1, FloatPoint const& p2, FloatPoint const& control)
{
constexpr static int tolerance = 15;