package org.simantics.district.network.ui;

import org.simantics.g2d.participant.PanZoomRotateHandler;
import org.simantics.scenegraph.g2d.events.MouseEvent.MouseWheelMovedEvent;
import org.simantics.scenegraph.g2d.nodes.NavigationNode;

public class DistrictPanZoomRotateHandler extends PanZoomRotateHandler {

    public DistrictPanZoomRotateHandler() {
    }

    @Override
    protected Class<? extends NavigationNode> getNavigationNodeClass() {
        return DistrictNavigationNode.class;
    }

    public static class DistrictNavigationNode extends NavigationNode {

        private static final long serialVersionUID = 5452897272925816875L;

        @Override
        public Double getZoomInLimit() {
            return super.getZoomInLimit();
        }

        @Override
        public Double getZoomOutLimit() {
            return super.getZoomOutLimit();
        }

        @Override
        public boolean mouseWheelMoved(MouseWheelMovedEvent me) {
            if (navigationEnabled && zoomEnabled) {
                double scroll = Math.min(0.9, -me.wheelRotation / 20.0);
                double z = 1 - scroll;
                double dx = (me.controlPosition.getX() - transform.getTranslateX()) / transform.getScaleX();
                double dy = (me.controlPosition.getY() - transform.getTranslateY()) / transform.getScaleY();
                dx = dx * (1 - z);
                dy = dy * (1 - z);
                double limitedScale = limitScaleFactor(z);
                if (limitedScale != 1.0) {
                    translate(dx, dy);
                    scale(z, z);
                    transformChanged();
                    dropQuality();
                    repaint();
                }
            }
            return false;
        }

    }
}