EraserTool.cpp

#include "EraserTool.h"

void EraserTool::onMousePressed(const sf::Vector2f& pos, sf::Mouse::Button btn) {
    if (btn == sf::Mouse::Left) {
        m_erasing = true;
        m_lastPos = pos;

        sf::CircleShape cap(m_thickness / 2.f);
        cap.setFillColor(m_bg);
        cap.setOrigin(m_thickness / 2.f, m_thickness / 2.f);
        cap.setPosition(pos);
        m_canvas->drawToCanvas(cap);
    }
}

void EraserTool::onMouseReleased(const sf::Vector2f& /*pos*/, sf::Mouse::Button btn) {
    if (btn == sf::Mouse::Left) m_erasing = false;
}

void EraserTool::onMouseMoved(const sf::Vector2f& pos) {
    if (!m_erasing) return;
    sf::Vector2f d = { pos.x - m_lastPos.x, pos.y - m_lastPos.y };
    float len = std::sqrt(d.x * d.x + d.y * d.y);
    if (len <= 0.0001f) return;

    sf::RectangleShape seg({ len, m_thickness });
    seg.setFillColor(m_bg);
    seg.setOrigin(0.f, m_thickness / 2.f);
    seg.setPosition(m_lastPos);
    float ang = std::atan2(d.y, d.x) * 180.f / 3.14159265f;
    seg.setRotation(ang);
    m_canvas->drawToCanvas(seg);

    sf::CircleShape cap(m_thickness / 2.f);
    cap.setFillColor(m_bg);
    cap.setOrigin(m_thickness / 2.f, m_thickness / 2.f);
    cap.setPosition(pos);
    m_canvas->drawToCanvas(cap);

    m_lastPos = pos;
}