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PixelPaint: Add ability to draw rectangle from center

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Essentially the same logic as the prior commit, but now for the
`RectangleTool` class. Pressing `alt` lets you draw the rectangle
with the starting position as the center.
This commit is contained in:
Mustafa Quraish 2021-08-26 15:58:04 -04:00 • committed by Andreas Kling
parent 1a3481f35b
commit 6ccdc018b4
2 changed files with 24 additions and 8 deletions
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23
Userland/Applications/PixelPaint/RectangleTool.cpp
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@ -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
*/
@ -25,8 +26,16 @@ RectangleTool::~RectangleTool()
{
}
void RectangleTool::draw_using(GUI::Painter& painter, Gfx::IntRect const& rect)
void RectangleTool::draw_using(GUI::Painter& painter, Gfx::IntPoint const& start_position, Gfx::IntPoint const& end_position)
{
Gfx::IntRect rect;
if (m_draw_mode == DrawMode::FromCenter) {
auto delta = end_position - start_position;
rect = Gfx::IntRect::from_two_points(start_position - delta, end_position);
} else {
rect = Gfx::IntRect::from_two_points(start_position, end_position);
}
switch (m_mode) {
case Mode::Fill:
painter.fill_rect(rect, m_editor->color_for(m_drawing_button));
@ -67,8 +76,7 @@ void RectangleTool::on_mouseup(Layer* layer, MouseEvent& event)
if (event.layer_event().button() == m_drawing_button) {
GUI::Painter painter(layer->bitmap());
auto rect = Gfx::IntRect::from_two_points(m_rectangle_start_position, m_rectangle_end_position);
draw_using(painter, rect);
draw_using(painter, m_rectangle_start_position, m_rectangle_end_position);
m_drawing_button = GUI::MouseButton::None;
layer->did_modify_bitmap();
m_editor->did_complete_action();
@ -83,6 +91,8 @@ void RectangleTool::on_mousemove(Layer* layer, MouseEvent& event)
if (m_drawing_button == GUI::MouseButton::None)
return;
m_draw_mode = event.layer_event().alt() ? DrawMode::FromCenter : DrawMode::FromCorner;
m_rectangle_end_position = event.layer_event().position();
m_editor->update();
}
@ -94,10 +104,9 @@ void RectangleTool::on_second_paint(Layer const* layer, GUI::PaintEvent& event)
GUI::Painter painter(*m_editor);
painter.add_clip_rect(event.rect());
auto rect = Gfx::IntRect::from_two_points(
m_editor->layer_position_to_editor_position(*layer, m_rectangle_start_position).to_type<int>(),
m_editor->layer_position_to_editor_position(*layer, m_rectangle_end_position).to_type<int>());
draw_using(painter, rect);
auto start_position = m_editor->layer_position_to_editor_position(*layer, m_rectangle_start_position).to_type<int>();
auto end_position = m_editor->layer_position_to_editor_position(*layer, m_rectangle_end_position).to_type<int>();
draw_using(painter, start_position, end_position);
}
void RectangleTool::on_keydown(GUI::KeyEvent& event)