413618454b
Holding Shift key will constrain the LineTool's line angle to 15 degrees increments. Many graphics editors have similar feature.
122 lines
3.4 KiB
C++
122 lines
3.4 KiB
C++
#include "LineTool.h"
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#include "PaintableWidget.h"
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#include <LibGUI/GAction.h>
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#include <LibGUI/GMenu.h>
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#include <LibGUI/GPainter.h>
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#include <LibM/math.h>
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Point constrain_line_angle(const Point& start_pos, const Point& end_pos, float angle_increment)
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{
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float current_angle = atan2(end_pos.y() - start_pos.y(), end_pos.x() - start_pos.x()) + M_PI * 2.;
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float constrained_angle = ((int)((current_angle + angle_increment / 2.) / angle_increment)) * angle_increment;
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auto diff = end_pos - start_pos;
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float line_length = sqrt(diff.x() * diff.x() + diff.y() * diff.y());
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return { start_pos.x() + (int)(cos(constrained_angle) * line_length),
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start_pos.y() + (int)(sin(constrained_angle) * line_length) };
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}
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LineTool::LineTool()
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{
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}
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LineTool::~LineTool()
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{
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}
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void LineTool::on_mousedown(GMouseEvent& event)
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{
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if (event.button() != GMouseButton::Left && event.button() != GMouseButton::Right)
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return;
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if (m_drawing_button != GMouseButton::None)
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return;
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m_drawing_button = event.button();
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m_line_start_position = event.position();
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m_line_end_position = event.position();
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m_widget->update();
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}
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void LineTool::on_mouseup(GMouseEvent& event)
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{
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if (event.button() == m_drawing_button) {
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GPainter painter(m_widget->bitmap());
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painter.draw_line(m_line_start_position, m_line_end_position, m_widget->color_for(m_drawing_button), m_thickness);
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m_drawing_button = GMouseButton::None;
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m_widget->update();
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}
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}
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void LineTool::on_mousemove(GMouseEvent& event)
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{
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if (m_drawing_button == GMouseButton::None)
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return;
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if (!m_widget->rect().contains(event.position()))
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return;
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if (!m_constrain_angle) {
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m_line_end_position = event.position();
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} else {
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const float ANGLE_STEP = M_PI / 8.0f;
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m_line_end_position = constrain_line_angle(m_line_start_position, event.position(), ANGLE_STEP);
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}
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m_widget->update();
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}
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void LineTool::on_second_paint(GPaintEvent& event)
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{
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if (m_drawing_button == GMouseButton::None)
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return;
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GPainter painter(*m_widget);
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painter.add_clip_rect(event.rect());
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painter.draw_line(m_line_start_position, m_line_end_position, m_widget->color_for(m_drawing_button), m_thickness);
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}
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void LineTool::on_keydown(GKeyEvent& event)
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{
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if (event.key() == Key_Escape && m_drawing_button != GMouseButton::None) {
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m_drawing_button = GMouseButton::None;
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m_widget->update();
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event.accept();
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}
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if (event.key() == Key_Shift) {
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m_constrain_angle = true;
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m_widget->update();
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event.accept();
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}
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}
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void LineTool::on_keyup(GKeyEvent& event)
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{
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if (event.key() == Key_Shift) {
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m_constrain_angle = false;
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m_widget->update();
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event.accept();
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}
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}
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void LineTool::on_contextmenu(GContextMenuEvent& event)
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{
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if (!m_context_menu) {
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m_context_menu = GMenu::construct();
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m_context_menu->add_action(GAction::create("1", [this](auto&) {
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m_thickness = 1;
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}));
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m_context_menu->add_action(GAction::create("2", [this](auto&) {
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m_thickness = 2;
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}));
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m_context_menu->add_action(GAction::create("3", [this](auto&) {
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m_thickness = 3;
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}));
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m_context_menu->add_action(GAction::create("4", [this](auto&) {
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m_thickness = 4;
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}));
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}
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m_context_menu->popup(event.screen_position());
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}
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