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PaintBrush: Add a "line" tool for drawing straight lines

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This implements "preview" of the line by allowing tool subclasses to
hook the second_paint_event on the PaintableWidget.

Work towards #375.
This commit is contained in:
Andreas Kling 2019-11-29 22:34:08 +01:00
parent f04394b9f3
commit 4e6cd541c9
8 changed files with 137 additions and 9 deletions
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79
Applications/PaintBrush/LineTool.cpp Normal file
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#include "LineTool.h"
#include "PaintableWidget.h"
#include <LibGUI/GAction.h>
#include <LibGUI/GMenu.h>
#include <LibGUI/GPainter.h>
LineTool::LineTool()
{
}
LineTool::~LineTool()
{
}
void LineTool::on_mousedown(GMouseEvent& event)
{
if (event.button() != GMouseButton::Left && event.button() != GMouseButton::Right)
return;
if (m_drawing_button != GMouseButton::None)
return;
m_drawing_button = event.button();
m_line_start_position = event.position();
m_line_end_position = event.position();
m_widget->update();
}
void LineTool::on_mouseup(GMouseEvent& event)
{
if (event.button() == m_drawing_button) {
GPainter painter(m_widget->bitmap());
painter.draw_line(m_line_start_position, m_line_end_position, m_widget->color_for(m_drawing_button), m_thickness);
m_drawing_button = GMouseButton::None;
m_widget->update();
}
}
void LineTool::on_mousemove(GMouseEvent& event)
{
if (m_drawing_button == GMouseButton::None)
return;
if (!m_widget->rect().contains(event.position()))
return;
m_line_end_position = event.position();
m_widget->update();
}
void LineTool::on_second_paint(GPaintEvent& event)
{
if (m_drawing_button == GMouseButton::None)
return;
GPainter painter(*m_widget);
painter.add_clip_rect(event.rect());
painter.draw_line(m_line_start_position, m_line_end_position, m_widget->color_for(m_drawing_button), m_thickness);
}
void LineTool::on_contextmenu(GContextMenuEvent& event)
{
if (!m_context_menu) {
m_context_menu = make<GMenu>();
m_context_menu->add_action(GAction::create("1", [this](auto&) {
m_thickness = 1;
}));
m_context_menu->add_action(GAction::create("2", [this](auto&) {
m_thickness = 2;
}));
m_context_menu->add_action(GAction::create("3", [this](auto&) {
m_thickness = 3;
}));
m_context_menu->add_action(GAction::create("4", [this](auto&) {
m_thickness = 4;
}));
}
m_context_menu->popup(event.screen_position());
}