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PaintBrush: Add an erase tool

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This commit is contained in:
Robin Burchell 2019-06-28 11:11:06 +02:00 • committed by Andreas Kling
parent e971f5604c
commit 24ada6bd1f
4 changed files with 92 additions and 0 deletions
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67
Applications/PaintBrush/EraseTool.cpp Normal file
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#include "EraseTool.h"
#include "PaintableWidget.h"
#include <LibGUI/GAction.h>
#include <LibGUI/GMenu.h>
#include <LibGUI/GPainter.h>
EraseTool::EraseTool()
{
}
EraseTool::~EraseTool()
{
}
Rect EraseTool::build_rect(const Point& pos, const Rect& widget_rect)
{
const int base_eraser_size = 10;
const int eraser_size = (base_eraser_size * m_thickness);
const int eraser_radius = eraser_size / 2;
const auto ex = pos.x();
const auto ey = pos.y();
return Rect(ex - eraser_radius, ey - eraser_radius, eraser_size, eraser_size).intersected(widget_rect);
}
void EraseTool::on_mousedown(GMouseEvent& event)
{
if (event.button() != GMouseButton::Left && event.button() != GMouseButton::Right)
return;
Rect r = build_rect(event.position(), m_widget->bitmap().rect());
GPainter painter(m_widget->bitmap());
painter.fill_rect(r, Color(Color::White));
m_widget->update();
}
void EraseTool::on_mousemove(GMouseEvent& event)
{
if (!m_widget->rect().contains(event.position()))
return;
if (event.buttons() & GMouseButton::Left || event.buttons() & GMouseButton::Right) {
Rect r = build_rect(event.position(), m_widget->bitmap().rect());
GPainter painter(m_widget->bitmap());
painter.fill_rect(r, Color(Color::White));
m_widget->update();
}
}
void EraseTool::on_contextmenu(GContextMenuEvent& event)
{
if (!m_context_menu) {
m_context_menu = make<GMenu>("EraseTool Context Menu");
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());
}