praktikum-holons/src/ui/view/MyCanvas.java

package ui.view;

import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Rectangle;
import java.awt.RenderingHints;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
import java.awt.geom.Line2D;
import java.io.File;
import java.util.ArrayList;
import java.util.Timer;
import java.util.TimerTask;

import javax.swing.ImageIcon;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JToolTip;

import classes.CpsEdge;
import classes.CpsNode;
import classes.CpsObject;
import classes.HolonElement;
import classes.HolonObject;
import classes.HolonSwitch;
import ui.controller.Control;
import ui.model.Model;
import ui.model.idCounter;

class MyCanvas extends JPanel implements MouseListener, MouseMotionListener {
	private Image img = null; // Contains the image to draw on MyCanvas
	private int x = 0;
	private int y = 0;
	// edge Object Start Point
	private Model model;
	private final Control controller;
	Graphics2D g2; // For Painting
	private int cx;
	private int cy;
	ArrayList<HolonElement> dataSelected = new ArrayList<HolonElement>();

	private boolean dragging = false; // for dragging
	private boolean drawEdge = false; // for drawing edges
	private boolean click = false; // for double click
	public CpsObject tempCps = null;
	private Rectangle selectRect = new Rectangle();
	private CpsEdge edgeHighlight = null;

	// PopUpMenu
	private JPopupMenu popmenu = new JPopupMenu();
	private JMenuItem itemDelete = new JMenuItem("Delete Object");
	private JToolTip objectTT = new JToolTip();

	public MyCanvas(final Model model, Control control) {
		this.add(objectTT);
		this.controller = control;
		this.model = model;

		popmenu.add(itemDelete);
		itemDelete.setEnabled(false);
		itemDelete.addActionListener(new ActionListener() {
			@Override
			public void actionPerformed(ActionEvent e) {
				// Remove the selected Object object
				controller.delCanvasObject(tempCps);
				tempCps = null;
				selectRect.setRect(0, 0, 0, 0);
				repaint();
			}
		});

		this.addMouseListener(this);
		this.addMouseMotionListener(this);
	}

	/**
	 * Paints all Components on the Canvas
	 * 
	 * @param Graphics
	 * 
	 */
	public void paintComponent(Graphics g) {
		super.paintComponent(g);
		// Rendering
		g2 = (Graphics2D) g;
		RenderingHints rh = new RenderingHints(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
		g2.setRenderingHints(rh);

		// Selection
		if (selectRect != null && controller.searchByID(model.getSelectedObjectID()) != null
				&& controller.searchByID(model.getSelectedObjectID()).getClass() != CpsNode.class) {
			g2.setColor(Color.BLUE);
			g2.fillRect((int) selectRect.getX(), (int) selectRect.getY(), (int) selectRect.getWidth(),
					(int) selectRect.getHeight());
		}

		// drawEdges
		g2.setColor(Color.BLACK);
		if (drawEdge) {
			g2.setStroke(new BasicStroke(2));
			g2.drawLine(tempCps.getPosition().x + controller.getScaleDiv2(),
					tempCps.getPosition().y + controller.getScaleDiv2(), x, y);
		}

		for (CpsEdge con : model.getEdgesOnCanvas()) {
			if (con.getA().getID() != model.getSelectedObjectID() && con.getB().getID() != model.getSelectedObjectID()
					&& con != edgeHighlight) {
				g2.setStroke(new BasicStroke(Math.min((con.getFlow() / con.getCapacity() * 4), 4)));
				g2.drawLine(con.getA().getPosition().x + controller.getScaleDiv2(),
						con.getA().getPosition().y + controller.getScaleDiv2(),
						con.getB().getPosition().x + controller.getScaleDiv2(),
						con.getB().getPosition().y + controller.getScaleDiv2());
				g2.drawString(con.getFlow() + "/" + con.getCapacity(),
						(con.getA().getPosition().x + con.getB().getPosition().x) / 2 + controller.getScaleDiv2(),
						(con.getA().getPosition().y + con.getB().getPosition().y) / 2 + controller.getScaleDiv2());
			}
		}

		// Highlighted Edge
		if (model.getSelectedObjectID() > 0) {
			g2.setColor(Color.BLUE);
			for (CpsEdge con : model.getEdgesOnCanvas()) {
				if (con.getA().getID() == model.getSelectedObjectID()
						|| con.getB().getID() == model.getSelectedObjectID() && con != edgeHighlight) {
					g2.drawLine(con.getA().getPosition().x + controller.getScaleDiv2(),
							con.getA().getPosition().y + controller.getScaleDiv2(),
							con.getB().getPosition().x + controller.getScaleDiv2(),
							con.getB().getPosition().y + controller.getScaleDiv2());
					g2.drawString(con.getFlow() + "/" + con.getCapacity(),
							(con.getA().getPosition().x + con.getB().getPosition().x) / 2 + controller.getScaleDiv2(),
							(con.getA().getPosition().y + con.getB().getPosition().y) / 2 + controller.getScaleDiv2());
				}
			}
		} else if (edgeHighlight != null) {
			g2.setColor(Color.BLUE);
			g2.drawLine(edgeHighlight.getA().getPosition().x + controller.getScaleDiv2(),
					edgeHighlight.getA().getPosition().y + controller.getScaleDiv2(),
					edgeHighlight.getB().getPosition().x + controller.getScaleDiv2(),
					edgeHighlight.getB().getPosition().y + controller.getScaleDiv2());
			g2.drawString(edgeHighlight.getFlow() + "/" + edgeHighlight.getCapacity(),
					(edgeHighlight.getA().getPosition().x + edgeHighlight.getB().getPosition().x) / 2
							+ controller.getScaleDiv2(),
					(edgeHighlight.getA().getPosition().y + edgeHighlight.getB().getPosition().y) / 2
							+ controller.getScaleDiv2());
		}

		// Objects
		for (CpsObject cps : model.getObjectsOnCanvas()) {
			if (cps.getID() == model.getSelectedObjectID() && controller.searchByID(model.getSelectedObjectID()) != null
					&& controller.searchByID(model.getSelectedObjectID()).getClass() == CpsNode.class) {
				img = new ImageIcon(this.getClass().getResource("/Images/node_selected.png")).getImage();
			} else {
				File checkPath = new File(cps.getImage());
				if (checkPath.exists()) {
					img = new ImageIcon(cps.getImage()).getImage();
				} else {
					img = new ImageIcon(this.getClass().getResource(cps.getImage())).getImage();
				}
			}
			g2.drawImage(img, cps.getPosition().x, cps.getPosition().y, controller.getScale(), controller.getScale(),
					null);

		}
	}

	@Override
	public void mouseClicked(MouseEvent e) {
		// If double clicked on a Switch change the Image to on/off
		if (doubleClick() && tempCps != null && tempCps.getClass() == HolonSwitch.class) {
				((HolonSwitch)tempCps).switchState();
		}
		repaint();
	}

	@Override
	public void mouseEntered(MouseEvent e) {
		// TODO Auto-generated method stub

	}

	@Override
	public void mouseExited(MouseEvent e) {
		// TODO Auto-generated method stub

	}

	@Override
	public void mousePressed(MouseEvent e) {
		tempCps = null;
		dataSelected = null;
		edgeHighlight = null;
		controller.setSelecteEdge(null);
		// Object Selection
		for (CpsObject cps : model.getObjectsOnCanvas()) {
			cx = cps.getPosition().x;
			cy = cps.getPosition().y;
			if (x - controller.getScale() <= cx && y - controller.getScale() <= cy && x >= cx && y >= cy) {
				tempCps = cps;
				// If drawing an Edge (CTRL down)
				if (e.isControlDown()) {
					drawEdge = true;
					drawEdge = true;
				}
				if (tempCps.getClass() == HolonObject.class) {
					HolonObject tempObj = ((HolonObject) tempCps);
					dataSelected = tempObj.getElements();
				}
			}
		}
		// Edge Selection
		if (tempCps == null) {
			edgeHighlight = mousePositionOnEdge(x, y);
			controller.setSelecteEdge(edgeHighlight);
		}
		// Object Selection Highlighting (selectRect)
		objectSelectionHighlighting();

		repaint();
	}

	@Override
	public void mouseReleased(MouseEvent e) {
		if (drawEdge) {
			drawEdge = false;
			drawDeleteEdge();
		}

		// if Dragged reposition the Object
		if (dragging) {
			x = e.getX();
			y = e.getY();
			dragging = false;
			tempCps.setPosition(e.getX() - controller.getScaleDiv2(), e.getY() - controller.getScaleDiv2());
		}

		// Rightclick List
		if (e.getButton() == MouseEvent.BUTTON3) {
			if (e.getButton() == MouseEvent.BUTTON3 && tempCps != null) {
				itemDelete.setEnabled(true);
			} else {
				itemDelete.setEnabled(false);
			}
			popmenu.show(e.getComponent(), e.getX(), e.getY());
		}

		repaint();
	}

	@Override
	public void mouseDragged(MouseEvent e) {
		// If Edge is drawn
		if (drawEdge) {
			x = e.getX();
			y = e.getY();
			repaint();
		} else {
			try {
				// Au�erhalb des Randes gedragged?
				x = e.getX() - controller.getScaleDiv2();
				y = e.getY() - controller.getScaleDiv2();
				if (e.getX() < controller.getScaleDiv2())
					x = 0;
				else if (e.getX() > this.getWidth() - controller.getScaleDiv2())
					x = this.getWidth() - controller.getScale();
				if (e.getY() < controller.getScaleDiv2())
					y = 0;
				else if (e.getY() > this.getHeight() - controller.getScaleDiv2())
					y = this.getHeight() - controller.getScale();
				// Drag Position
				tempCps.setPosition(x, y);
				// Highlighting Position
				selectRect.setLocation(x - (controller.getScale() / 20), y - (controller.getScale() / 20));
				// TipText Position and name
				objectTT.setTipText(tempCps.getName());
				objectTT.setLocation(x, y + controller.getScale());
				repaint();
			} catch (Exception e2) {

			}
		}
	}

	@Override
	public void mouseMoved(MouseEvent e) {
		x = e.getX();
		y = e.getY();
		// Everytghing for the tooltip :)
		boolean on = false;
		for (CpsObject cps : model.getObjectsOnCanvas()) {

			cx = cps.getPosition().x;
			cy = cps.getPosition().y;
			if (x - controller.getScale() <= cx && y - controller.getScale() <= cy && x >= cx && y >= cy) {

				objectTT.setTipText(cps.getName());
				objectTT.setLocation(cx, cy + controller.getScale());
				on = true;
			}
		}
		if (!on) {
			objectTT.setLocation(-200, -200);
			objectTT.setTipText("");
		}
	}

	/**
	 * Sets the Highlighting of the Selected Object
	 */
	public void objectSelectionHighlighting() {
		if (tempCps != null) {
			selectRect.setBounds(tempCps.getPosition().x - (controller.getScale() / 20),
					tempCps.getPosition().y - (controller.getScale() / 20),
					controller.getScale() + controller.getScale() / 10,
					controller.getScale() + controller.getScale() / 10);

			controller.setSelectedObjectID(tempCps.getID());
		} else {
			controller.setSelectedObjectID(0);
			selectRect.setRect(0, 0, 0, 0);
		}
	}

	/**
	 * Draws or Deletes an Edge
	 */
	private void drawDeleteEdge() {
		boolean node = true;
		boolean newEdge = true;
		boolean onEdge = true;
		boolean deleteNode = false;
		CpsEdge e = null;
		CpsObject tempCPS = null;

		for (CpsObject cps : model.getObjectsOnCanvas()) {
			cx = cps.getPosition().x;
			cy = cps.getPosition().y;
			if (x - controller.getScale() <= cx && y - controller.getScale() <= cy && x >= cx && y >= cy
					&& cps != tempCps) {
				node = false;
				onEdge = false;
				for (CpsEdge p : tempCps.getConnections()) {
					if ((p.getA() == tempCps && p.getB() == cps) || (p.getB() == tempCps && p.getA() == cps)) {
						newEdge = false;
						e = p;
					}
				}
				if (!newEdge) {
					controller.removeEdgesOnCanvas(e);
					tempCps.getConnections().remove(e);
					cps.getConnections().remove(e);
					// Node ohne Edge?
					if (e.getA().getClass() == CpsNode.class && e.getA().getConnections().isEmpty()) {
						tempCps = e.getA();
						deleteNode = true;
					}
					if (e.getB().getClass() == CpsNode.class && e.getB().getConnections().isEmpty()) {
						tempCPS = e.getB();
						deleteNode = true;
					}
				}
				if (newEdge) {
					e = new CpsEdge(cps, tempCps);
					// cps.AddConnection(e);
					// tempCps.AddConnection(e);
					controller.AddEdgeOnCanvas(e);
				}
			}
		}
		// Auf eine Edge gezoggen?
		if (onEdge) {
			CpsEdge p = mousePositionOnEdge(x, y);
			if (p != null) {
				CpsEdge temp = null;
				CpsEdge e1 = null;
				CpsEdge e2 = null;

				node = false;

				CpsNode n = new CpsNode("Node");
				n.setID(idCounter.nextId());
				n.setPosition(x - model.getScaleDiv2(), y - model.getScaleDiv2());
				controller.addObjectCanvas(n);

				CpsObject r, k;
				r = p.getA();
				k = p.getB();

				e = new CpsEdge(n, tempCps);
				// n.AddConnection(e);
				// tempCps.AddConnection(e);

				e1 = new CpsEdge(n, r);
				// n.AddConnection(e1);
				// r.AddConnection(e1);

				e2 = new CpsEdge(n, k);
				// n.AddConnection(e2);
				// k.AddConnection(e2);

				p.getA().getConnections().remove(p);
				p.getB().getConnections().remove(p);

				temp = p;
				controller.removeEdgesOnCanvas(temp);
				controller.AddEdgeOnCanvas(e);
				controller.AddEdgeOnCanvas(e1);
				controller.AddEdgeOnCanvas(e2);
			}
		}

		// ins leere Gedragged
		if (node) {
			CpsNode n = new CpsNode("Node");
			n.setID(idCounter.nextId());
			n.setPosition(x - model.getScaleDiv2(), y - model.getScaleDiv2());
			controller.addObjectCanvas(n);

			e = new CpsEdge(n, tempCps);

			// n.AddConnection(e);
			// tempCps.AddConnection(e);
			controller.AddEdgeOnCanvas(e);
			System.out.println("node ID: " + n.getID());
		}

		// Wenn ein Node ohne Connections da ist
		if (deleteNode) {
			controller.delCanvasObject(tempCps);
			controller.delCanvasObject(tempCPS);
			tempCPS = null;
			tempCps = null;
			objectSelectionHighlighting();
		}
	}

	/**
	 * Checks if the mouse is on an Edge
	 * 
	 * @param x
	 *            Position of the Mouse
	 * @param y
	 *            Position of the Mouse
	 * 
	 * @return CpsEdge the Mouse is on, null if the mouse is not on an Edge
	 */
	public CpsEdge mousePositionOnEdge(int x, int y) {
		int lx, ly, hx, hy;
		for (CpsEdge p : model.getEdgesOnCanvas()) {
			Line2D l = new Line2D.Float(p.getA().getPosition().x, p.getA().getPosition().y, p.getB().getPosition().x,
					p.getB().getPosition().y);
			if (p.getA().getPosition().x > p.getB().getPosition().x) {
				hx = p.getA().getPosition().x + model.getScaleDiv2() + 7;
				lx = p.getB().getPosition().x + model.getScaleDiv2() - 7;
			} else {
				lx = p.getA().getPosition().x + model.getScaleDiv2() - 7;
				hx = p.getB().getPosition().x + model.getScaleDiv2() + 7;
			}
			if (p.getA().getPosition().y > p.getB().getPosition().y) {
				hy = p.getA().getPosition().y + model.getScaleDiv2() + 7;
				ly = p.getB().getPosition().y + model.getScaleDiv2() - 7;
			} else {
				ly = p.getA().getPosition().y + model.getScaleDiv2() - 7;
				hy = p.getB().getPosition().y + model.getScaleDiv2() + 7;
			}

			// distance from a point to a line and between both Objects
			if (l.ptLineDistSq(x - model.getScaleDiv2(), y - model.getScaleDiv2()) < 14 && x > lx && x < hx && y > ly
					&& y < hy) {
				return p;
			}
		}
		return null;
	}

	/**
	 * Checks if a double click was made
	 * 
	 * @return true if doublecklick, false if not
	 */
	private boolean doubleClick() {
		if (click) {
			click = false;
			return true;
		} else {
			click = true;
			Timer t = new Timer("doubleclickTimer", false);
			t.schedule(new TimerTask() {
				@Override
				public void run() {
					click = false;
				}
			}, 500);
		}
		return false;
	}
}