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LibGfx: Add alternate_color to draw_line

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This alternate_color can be used when drawing dashed lines to have two
alternating Colors.
This commit is contained in:
Tobias Christiansen 2021-08-05 16:34:03 +02:00 committed by Ali Mohammad Pur
parent 4a57a4a0b3
commit 61a1122c2d
Notes: sideshowbarker 2024-07-18 07:22:53 +09:00 
Author: https://github.com/TobyAsE
Commit: https://github.com/SerenityOS/serenity/commit/61a1122c2d9
Pull-request: https://github.com/SerenityOS/serenity/pull/9155
Reviewed-by: https://github.com/alimpfard
2 changed files with 14 additions and 2 deletions
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14
Userland/Libraries/LibGfx/Painter.cpp
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@ -1631,7 +1631,7 @@ void Painter::draw_physical_pixel(const IntPoint& physical_position, Color color
fill_physical_rect(rect, color);
}
void Painter::draw_line(IntPoint const& a_p1, IntPoint const& a_p2, Color color, int thickness, LineStyle style)
void Painter::draw_line(IntPoint const& a_p1, IntPoint const& a_p2, Color color, int thickness, LineStyle style, Color alternate_color)
{
if (color.alpha() == 0)
return;
@ -1645,6 +1645,8 @@ void Painter::draw_line(IntPoint const& a_p1, IntPoint const& a_p2, Color color,
auto point2 = to_physical(p2);
thickness *= scale();
auto alternate_color_is_transparent = alternate_color == Color::Transparent;
// Special case: vertical line.
if (point1.x() == point2.x()) {
const int x = point1.x();
@ -1666,6 +1668,11 @@ void Painter::draw_line(IntPoint const& a_p1, IntPoint const& a_p2, Color color,
draw_physical_pixel({ x, y }, color, thickness);
draw_physical_pixel({ x, min(y + thickness, max_y) }, color, thickness);
draw_physical_pixel({ x, min(y + thickness * 2, max_y) }, color, thickness);
if (!alternate_color_is_transparent) {
draw_physical_pixel({ x, min(y + thickness * 3, max_y) }, alternate_color, thickness);
draw_physical_pixel({ x, min(y + thickness * 4, max_y) }, alternate_color, thickness);
draw_physical_pixel({ x, min(y + thickness * 5, max_y) }, alternate_color, thickness);
}
}
} else {
for (int y = min_y; y <= max_y; y += thickness)
@ -1695,6 +1702,11 @@ void Painter::draw_line(IntPoint const& a_p1, IntPoint const& a_p2, Color color,
draw_physical_pixel({ x, y }, color, thickness);
draw_physical_pixel({ min(x + thickness, max_x), y }, color, thickness);
draw_physical_pixel({ min(x + thickness * 2, max_x), y }, color, thickness);
if (!alternate_color_is_transparent) {
draw_physical_pixel({ min(x + thickness * 3, max_x), y }, alternate_color, thickness);
draw_physical_pixel({ min(x + thickness * 4, max_x), y }, alternate_color, thickness);
draw_physical_pixel({ min(x + thickness * 5, max_x), y }, alternate_color, thickness);
}
}
} else {
for (int x = min_x; x <= max_x; x += thickness)

2
Userland/Libraries/LibGfx/Painter.h
View File

@ -51,7 +51,7 @@ public:
void draw_ellipse_intersecting(const IntRect&, Color, int thickness = 1);
void set_pixel(const IntPoint&, Color);
void set_pixel(int x, int y, Color color) { set_pixel({ x, y }, color); }
void draw_line(const IntPoint&, const IntPoint&, Color, int thickness = 1, LineStyle style = LineStyle::Solid);
void draw_line(const IntPoint&, const IntPoint&, Color, int thickness = 1, LineStyle style = LineStyle::Solid, Color alternate_color = Color::Transparent);
void draw_quadratic_bezier_curve(const IntPoint& control_point, const IntPoint&, const IntPoint&, Color, int thickness = 1, LineStyle style = LineStyle::Solid);
void draw_elliptical_arc(const IntPoint& p1, const IntPoint& p2, const IntPoint& center, const FloatPoint& radii, float x_axis_rotation, float theta_1, float theta_delta, Color, int thickness = 1, LineStyle style = LineStyle::Solid);
void blit(const IntPoint&, const Gfx::Bitmap&, const IntRect& src_rect, float opacity = 1.0f, bool apply_alpha = true);