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LibDraw: Support dotted lines in Painter::draw_line()

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Painter::draw_line() now has an optional "bool dotted" parameter that
causes it to only render every other pixel.

Note that this only works with horizontal and vertical lines at the
moment and we'll assert if called with dotted=true for a diagonal line.
This commit is contained in:
Andreas Kling 2019-11-27 20:52:11 +01:00
parent 5327de2df3
commit 478cfae7c8
2 changed files with 19 additions and 7 deletions
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24
Libraries/LibDraw/Painter.cpp
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@ -71,7 +71,6 @@ void Painter::clear_rect(const Rect& a_rect, Color color)
}
}
void Painter::fill_rect(const Rect& a_rect, Color color)
{
if (color.alpha() == 0)
@ -774,7 +773,7 @@ void Painter::draw_pixel(const Point& position, Color color, int thickness)
fill_rect(rect, color);
}
void Painter::draw_line(const Point& p1, const Point& p2, Color color, int thickness)
void Painter::draw_line(const Point& p1, const Point& p2, Color color, int thickness, bool dotted)
{
auto clip_rect = this->clip_rect();
@ -797,8 +796,13 @@ void Painter::draw_line(const Point& p1, const Point& p2, Color color, int thick
return;
int min_y = max(point1.y(), clip_rect.top());
int max_y = min(point2.y(), clip_rect.bottom());
for (int y = min_y; y <= max_y; ++y)
draw_pixel({ x, y }, color, thickness);
if (dotted) {
for (int y = min_y; y <= max_y; y += 2)
draw_pixel({ x, y }, color, thickness);
} else {
for (int y = min_y; y <= max_y; ++y)
draw_pixel({ x, y }, color, thickness);
}
return;
}
@ -815,11 +819,19 @@ void Painter::draw_line(const Point& p1, const Point& p2, Color color, int thick
return;
int min_x = max(point1.x(), clip_rect.left());
int max_x = min(point2.x(), clip_rect.right());
for (int x = min_x; x <= max_x; ++x)
draw_pixel({ x, y }, color, thickness);
if (dotted) {
for (int x = min_x; x <= max_x; x += 2)
draw_pixel({ x, y }, color, thickness);
} else {
for (int x = min_x; x <= max_x; ++x)
draw_pixel({ x, y }, color, thickness);
}
return;
}
// FIXME: Implement dotted diagonal lines.
ASSERT(!dotted);
const double adx = abs(point2.x() - point1.x());
const double ady = abs(point2.y() - point1.y());