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PaintBrush: Implement a thickness setting for the pen tool.

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Painter gains the ability to draw lines with arbitrary thickness.
It's basically implemented by drawing filled rects for thickness>1.

In PaintBrush, Tool classes can now override on_contextmenu() to
provide a context menu for the toolbox button. :^)
This commit is contained in:
Andreas Kling 2019-06-23 10:00:02 +02:00
parent 08c04f0a41
commit 5aefd7f828
6 changed files with 57 additions and 21 deletions
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26
SharedGraphics/Painter.cpp
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@ -636,7 +636,16 @@ void Painter::set_pixel(const Point& p, Color color)
pixel ^= color.value();
}
void Painter::draw_line(const Point& p1, const Point& p2, Color color)
void Painter::draw_pixel(const Point& position, Color color, int thickness)
{
ASSERT(draw_op() == DrawOp::Copy);
if (thickness == 1)
return set_pixel_with_draw_op(m_target->scanline(position.y())[position.x()], color);
Rect rect { position.translated(-(thickness / 2), -(thickness / 2)), { thickness, thickness } };
fill_rect(rect, color);
}
void Painter::draw_line(const Point& p1, const Point& p2, Color color, int thickness)
{
auto clip_rect = this->clip_rect();
@ -660,7 +669,7 @@ void Painter::draw_line(const Point& p1, const Point& p2, Color color)
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)
set_pixel_with_draw_op(m_target->scanline(y)[x], color);
draw_pixel({ x, y }, color, thickness);
return;
}
@ -677,13 +686,8 @@ void Painter::draw_line(const Point& p1, const Point& p2, Color color)
return;
int min_x = max(point1.x(), clip_rect.left());
int max_x = min(point2.x(), clip_rect.right());
auto* pixels = m_target->scanline(point1.y());
if (draw_op() == DrawOp::Copy) {
fast_dword_fill(pixels + min_x, color.value(), max_x - min_x + 1);
} else {
for (int x = min_x; x <= max_x; ++x)
set_pixel_with_draw_op(pixels[x], color);
}
for (int x = min_x; x <= max_x; ++x)
draw_pixel({ x, y }, color, thickness);
return;
}
@ -709,7 +713,7 @@ void Painter::draw_line(const Point& p1, const Point& p2, Color color)
int y = point1.y();
for (int x = point1.x(); x <= point2.x(); ++x) {
if (clip_rect.contains(x, y))
m_target->scanline(y)[x] = color.value();
draw_pixel({ x, y }, color, thickness);
error += delta_error;
if (error >= 0.5) {
y = (double)y + y_step;
@ -722,7 +726,7 @@ void Painter::draw_line(const Point& p1, const Point& p2, Color color)
int x = point1.x();
for (int y = point1.y(); y <= point2.y(); ++y) {
if (clip_rect.contains(x, y))
m_target->scanline(y)[x] = color.value();
draw_pixel({ x, y }, color, thickness);
error += delta_error;
if (error >= 0.5) {
x = (double)x + x_step;