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PixelPaint: Add ability to draw ellipse from center

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Like other common image editing applications, now if you press
`alt` while drawing an ellipse, it uses the starting position as
the center of the ellipse as opposed to one of the corners of the
bounding rect.

The EllipseTool class now keeps track of a `DrawMode`, which is
either `DrawMode::FromCorner` (default), or `DrawMode::FromCenter`
(the option added by this commit).

The `draw_using()` function was modified to now take in the start
and end positions and construct the `ellipse_intersecting_rect`
itself, since we need to construct it differently based on the
drawing mode.
This commit is contained in:
Mustafa Quraish 2021-08-26 15:54:00 -04:00 • committed by Andreas Kling
parent d04c8d478f
commit 1a3481f35b
2 changed files with 22 additions and 4 deletions
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17
Userland/Applications/PixelPaint/EllipseTool.cpp
View file

@ -1,5 +1,6 @@
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2021, Mustafa Quraish <mustafa@cs.toronto.edu>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -26,8 +27,16 @@ EllipseTool::~EllipseTool()
{
}
void EllipseTool::draw_using(GUI::Painter& painter, Gfx::IntRect const& ellipse_intersecting_rect)
void EllipseTool::draw_using(GUI::Painter& painter, Gfx::IntPoint const& start_position, Gfx::IntPoint const& end_position)
{
Gfx::IntRect ellipse_intersecting_rect;
if (m_draw_mode == DrawMode::FromCenter) {
auto delta = end_position - start_position;
ellipse_intersecting_rect = Gfx::IntRect::from_two_points(start_position - delta, end_position);
} else {
ellipse_intersecting_rect = Gfx::IntRect::from_two_points(start_position, end_position);
}
switch (m_mode) {
case Mode::Outline:
painter.draw_ellipse_intersecting(ellipse_intersecting_rect, m_editor->color_for(m_drawing_button), m_thickness);
@ -65,7 +74,7 @@ void EllipseTool::on_mouseup(Layer* layer, MouseEvent& event)
if (event.layer_event().button() == m_drawing_button) {
GUI::Painter painter(layer->bitmap());
draw_using(painter, Gfx::IntRect::from_two_points(m_ellipse_start_position, m_ellipse_end_position));
draw_using(painter, m_ellipse_start_position, m_ellipse_end_position);
m_drawing_button = GUI::MouseButton::None;
m_editor->update();
m_editor->did_complete_action();
@ -77,6 +86,8 @@ void EllipseTool::on_mousemove(Layer*, MouseEvent& event)
if (m_drawing_button == GUI::MouseButton::None)
return;
m_draw_mode = event.layer_event().alt() ? DrawMode::FromCenter : DrawMode::FromCorner;
m_ellipse_end_position = event.layer_event().position();
m_editor->update();
}
@ -90,7 +101,7 @@ void EllipseTool::on_second_paint(Layer const* layer, GUI::PaintEvent& event)
painter.add_clip_rect(event.rect());
auto preview_start = m_editor->layer_position_to_editor_position(*layer, m_ellipse_start_position).to_type<int>();
auto preview_end = m_editor->layer_position_to_editor_position(*layer, m_ellipse_end_position).to_type<int>();
draw_using(painter, Gfx::IntRect::from_two_points(preview_start, preview_end));
draw_using(painter, preview_start, preview_end);
}
void EllipseTool::on_keydown(GUI::KeyEvent& event)