View Edge Scrolling

edgescroll.cpp

// Map scrolling functions
auto panMap = [&mapView, &minimapView] (float speed, int dir) {
    float timeValue = TimePerFrame.asSeconds();
    float moveValue = speed * timeValue;

    if (dir == 0) { mapView.move(-moveValue, 0.f); minimapView.move(-moveValue, 0.f); }
    if (dir == 1) { mapView.move(moveValue,  0.f); minimapView.move(moveValue, 0.f);  }
    if (dir == 2) { mapView.move(0.f, -moveValue); minimapView.move(0.f, -moveValue); }
    if (dir == 3) { mapView.move(0.f, moveValue);  minimapView.move(0.f, moveValue);  }
};
auto panMapLeft  = [panMap] (float speed) { panMap(speed, 0); };
auto panMapRight = [panMap] (float speed) { panMap(speed, 1); };
auto panMapUp    = [panMap] (float speed) { panMap(speed, 2); };
auto panMapDown  = [panMap] (float speed) { panMap(speed, 3); };

sf::Vector2i mousePosition = sf::Mouse::getPosition(window);

// Map scrolling speed
float mapScrollSpeed     = 100.f;

// Map scroll trigger edge inset size in pixels
float mapScrollTreshold  = 50.f;

// Map edge treshold
float tresholdY = mapScrollTreshold;
float tresholdX = mapScrollTreshold;
float tresholdXEnd = window.getSize().x - mapScrollTreshold;
float tresholdYEnd = window.getSize().y - mapScrollTreshold;

float windowWidth = window.getSize().x;
float windowHeight = window.getSize().y;
float mouseX = mousePosition.x;
float mouseY = mousePosition.y;

if (mouseX < mapScrollTreshold && mouseX >= 0) {
    mapScrollSpeed += (mapScrollTreshold - mouseX) * 2.5f;
    panMapLeft(mapScrollSpeed);
}

if (mouseX >= windowWidth - mapScrollTreshold && mouseX <= windowWidth) {
    mapScrollSpeed += (mouseX - tresholdXEnd) * 2.5f;
    panMapRight(mapScrollSpeed);
}

if (mouseY < mapScrollTreshold && mouseY >= 0) {
    mapScrollSpeed += (mapScrollTreshold - mouseY) * 2.5f;
    panMapUp(mapScrollSpeed);
}

if (mouseY >= windowHeight - mapScrollTreshold && mouseY <= windowHeight) {
    mapScrollSpeed += (mouseY - tresholdYEnd) * 2.5f;
    panMapDown(mapScrollSpeed);
}