praktikum-holons/src/ui/view/main/HolonCanvas.java

package ui.view.main;

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;

import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;

import classes.Vector2d;

public class HolonCanvas extends JScrollPane {

	Canvas canvas = new Canvas();
	private Vector2d pos1 = new Vector2d(100, 100);
	private Vector2d pos2 = new Vector2d(200, 100);
	
	private int width = 1000;
	private int minWidth = 100;
	private int maxWidth = 4000;
	
	
	
	public HolonCanvas() {
		canvas.setPreferredSize(new Dimension(1000,1000));
		this.removeMouseWheelListener(this.getMouseWheelListeners()[0]);
		this.addMouseWheelListener(scroll -> {
			int scrollValue = -scroll.getWheelRotation() * scroll.getScrollAmount();
			//clamp value
			width = Math.max(Math.min(4000, width + 50 * scrollValue), 100);
			canvas.setPreferredSize(new Dimension(width, width));
			canvas.revalidate();
			this.repaint();
			
		});
		this.setViewportView(canvas);
	}
	
	
	private void exampleBuildings() {
		
	}
	
	
	
	
	
	
	
	private class Canvas extends JPanel{
		Canvas(){
			setBackground(Color.white);
			add(new JLabel("HolonCanvas"));
		}
		public void paintComponent(Graphics g) {		
			super.paintComponent(g);
			System.out.println("paintComponent");
			Graphics2D g2d = (Graphics2D) g;
			g2d.setRenderingHints(new RenderingHints(RenderingHints.KEY_ANTIALIASING,
					RenderingHints.VALUE_ANTIALIAS_ON));
			g2d.setColor(Color.blue);
			double scale = ScaleValue();
			g2d.fillRect((int)(pos1.getX() * scale), (int)(pos1.getY() * scale), (int) (50 * scale), (int)(50 * scale));
			g2d.fillRect((int)(pos2.getX() * scale), (int)(pos2.getY() * scale), (int) (50 * scale), (int)(50 * scale));
			g2d.drawRect(0, 0, this.getPreferredSize().width, this.getPreferredSize().height);
		}
		
		
		public double ScaleValue(){
			return width / 1000.0;
		}
	}
	
	
}