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

package ui.view;

import classes.*;
import ui.controller.Control;
import ui.controller.UpdateController;
import ui.model.Model;

import javax.swing.*;
import javax.swing.table.JTableHeader;

import java.awt.*;
import java.awt.event.MouseEvent;
import java.io.File;
import java.io.IOException;
import java.util.ArrayList;
import java.util.TimerTask;

/**
 * Collection of methods and values needed in both <code>MyCanvas</code> and
 * <code>UpperNodeCanvas</code>
 * <p>
 * Although Java works on references we chose to add explicit return values for
 * clearer code understanding in most cases
 *
 * @author: I. Dix
 */
public abstract class AbstractCanvas extends JPanel {
	/**
	 * Version
	 */
	private static final long serialVersionUID = 1L;
	
	final JMenuItem itemDelete = new JMenuItem(Languages.getLanguage()[98]);
	final JMenuItem itemCut = new JMenuItem(Languages.getLanguage()[95]);
	final JMenuItem itemCopy = new JMenuItem(Languages.getLanguage()[96]);
	final JMenuItem itemPaste = new JMenuItem(Languages.getLanguage()[97]);
	final JMenuItem itemGroup = new JMenuItem(Languages.getLanguage()[99]);
	final JMenuItem itemUngroup = new JMenuItem(Languages.getLanguage()[100]);
	final JMenuItem itemTrack = new JMenuItem(Languages.getLanguage()[101]);
	final JMenuItem itemUntrack = new JMenuItem(Languages.getLanguage()[102]);
	final JMenuItem itemAlign = new JMenuItem("Align selected");
	final JMenuItem itemCreateTemplate = new JMenuItem(Languages.getLanguage()[Languages.right_click_create_template]);
	
	final int ANIMTIME = 500; // animation Time
	private final int animFPS = 60;
	final int animDelay = 1000 / animFPS; // animation Delay
	protected Model model;
	protected Control controller;
	protected int x = 0;
	protected int y = 0;
	// Selection
	AbstractCpsObject tempCps = null;
	UpdateController updCon;
	
	//Replacement
	/**
	 * the CpsObject that might be replaced by drag&drop
	 */
	protected AbstractCpsObject mayBeReplaced = null;
	
	// PopUpMenu
	JPopupMenu popmenu = new JPopupMenu();
	// Tooltip
	boolean toolTip; // Tooltip on or off
	Position toolTipPos = new Position(); // Tooltip Position
	String toolTipText = "";
	ArrayList<HolonElement> dataSelected = new ArrayList<>();
	ArrayList<AbstractCpsObject> tempSelected = new ArrayList<>();
	boolean[] showedInformation = new boolean[5];
	boolean dragging = false; // for dragging
	boolean dragged = false; // if an object/objects was/were dragged
	boolean drawEdge = false; // for drawing edges
	boolean doMark = false; // for double click
	CpsEdge edgeHighlight = null;
	Point mousePosition = new Point(); // Mouse Position when
	ArrayList<Position> savePos;
	// edge Object Start Point
	int cx, cy;
	int sx, sy; // Mark Coords
	Position unPos;
	// Animation
	Timer animT; // animation Timer
	int animDuration = ANIMTIME; // animation Duration
	int animSteps = animDuration / animDelay; // animation Steps;
	ArrayList<AbstractCpsObject> animCps = null;
	// Graphics
	Image img = null; // Contains the image to draw on the Canvas
	Graphics2D g2; // For Painting
	float scalediv20;
	// Mouse
	private boolean click = false;

	// ------------------------------------------ METHODS
	// ------------------------------------------
	String paintEdge(CpsEdge con, String maxCap) {
		if (con!=null && con.getA() != null && con.getB() != null && con.getA().getId() != model.getSelectedObjectID() && con.getB().getId() != model.getSelectedObjectID()
				&& con != edgeHighlight) {
			if (con.getConnected() == CpsEdge.CON_UPPER_NODE
					|| con.getConnected() == CpsEdge.CON_UPPER_NODE_AND_INSIDE) {
				setEdgeState(con);
			} else {
				g2.setColor(Color.DARK_GRAY);
				g2.setStroke(new BasicStroke(2));
			}
			g2.drawLine(con.getA().getPosition().x, con.getA().getPosition().y, con.getB().getPosition().x,
					con.getB().getPosition().y);

			maxCap = setCapacityString(con, maxCap);

			if (showedInformation[0]) {
				if (con.getConnected() == CpsEdge.CON_UPPER_NODE
						|| con.getConnected() == CpsEdge.CON_UPPER_NODE_AND_INSIDE) {
					g2.drawString(con.getFlow() + "/" + maxCap,
							(con.getA().getPosition().x + con.getB().getPosition().x) / 2,
							(con.getA().getPosition().y + con.getB().getPosition().y) / 2);
				} else {
					g2.drawString("not connected", (con.getA().getPosition().x + con.getB().getPosition().x) / 2,
							(con.getA().getPosition().y + con.getB().getPosition().y) / 2);
				}
			}
		}

		return maxCap;
	}

	void setEdgeState(CpsEdge con) {
		if (con.isWorking()) {
			g2.setColor(Color.GREEN);
			if (con.getCapacity() != CpsEdge.CAPACITY_INFINITE) {
				g2.setStroke(new BasicStroke(Math.min(((con.getFlow() / con.getCapacity() * 3) + 1), 4)));
			}
		} else {
			g2.setColor(Color.RED);
			g2.setStroke(new BasicStroke(2));
		}
	}

	String setCapacityString(CpsEdge con, String maxCap) {
		if (con.getCapacity() == -1) {
			maxCap = Character.toString('\u221e');
		} else if (con.getCapacity() == -2) {
			maxCap = "???";
		} else {
			maxCap = String.valueOf(con.getCapacity());
		}
		return maxCap;
	}

	String drawEdgeLine(CpsEdge con, String maxCap) {
		if (con.getA().getId() == model.getSelectedObjectID() || model.getSelectedCpsObjects().contains(con.getA())
				|| tempSelected.contains(con.getA()) || con.getB().getId() == model.getSelectedObjectID()
				|| model.getSelectedCpsObjects().contains(con.getB())
				|| tempSelected.contains(con.getB()) && con != edgeHighlight) {
			g2.drawLine(con.getA().getPosition().x, con.getA().getPosition().y, con.getB().getPosition().x,
					con.getB().getPosition().y);

			maxCap = setCapacityString(con, maxCap);

			if (showedInformation[0]) {
				if (con.getConnected() == CpsEdge.CON_UPPER_NODE
						|| con.getConnected() == CpsEdge.CON_UPPER_NODE_AND_INSIDE) {
					g2.drawString(con.getFlow() + "/" + maxCap,
							(con.getA().getPosition().x + con.getB().getPosition().x) / 2,
							(con.getA().getPosition().y + con.getB().getPosition().y) / 2);
				} else {
					g2.drawString("not connected", (con.getA().getPosition().x + con.getB().getPosition().x) / 2,
							(con.getA().getPosition().y + con.getB().getPosition().y) / 2);
				}
			}
		}

		return maxCap;
	}

	/**
	 * Paints the SupplyBar for the given cps object on the canvas
	 * 
	 * @param g
	 *            Graphics used
	 * @param cps
	 *            cpsObject which the supplyBar should be drawn for
	 */
	protected void paintSupplyBar(Graphics g, AbstractCpsObject cps) {
		g2.setColor(Color.black);
		/**
		 * draw and fill the supply Bar
		 */
		if (model.getShowSupplyBars() && (cps instanceof HolonObject || cps instanceof HolonBattery))
		{
			// set Color & Percentage
			/**
			 * percentage the SupplyBar is representing
			 */
			float percentage = 0;
			/**
			 * color of the SupplyBar
			 */
			Color paintColor = Color.WHITE;
			if(cps instanceof HolonObject)
			{
				HolonObject hl = (HolonObject) cps;
				if (hl == null || !(hl.getState() == HolonObject.NOT_SUPPLIED
						|| hl.getState() == HolonObject.PARTIALLY_SUPPLIED || hl.getState() == HolonObject.OVER_SUPPLIED)) {
					/**
					 * don't show Bars for unsupplied oder fully supplied Objects
					 */
					return;
				}
				/**
				 * calculate Percentage & set Color
				 */
				percentage = hl.getSuppliedPercentage();
				paintColor = hl.getColor();
			}
			else if (cps instanceof HolonBattery){
				HolonBattery hB = (HolonBattery) cps;
				if(hB == null || hB.getCapacity() == 0){
					return;
				}
				/**
				 *  get percentage filled
				 */
				percentage = hB.getStateOfChargeAtTimeStep(model.getCurIteration()-1) / hB.getCapacity();

				/**
				 * calculate the Color (Red->Yellow->Green)
				 */
				Color color1 = Color.RED;
				Color color2 = Color.GREEN;
				//
				float colorPercentage;
				if(percentage < 0.5f){
					colorPercentage = percentage * 2;
					color1 = Color.RED;
					color2 = Color.YELLOW;
				}
				else {
					colorPercentage = (percentage - 0.5f) * 2;
					color1 = Color.YELLOW;
					color2 = Color.GREEN;
				}
				final int dRed = color2.getRed() - color1.getRed();
				final int dGreen = color2.getGreen() - color1.getGreen();
				final int dBlue = color2.getBlue() - color1.getBlue();	
				
				int resultRed = color1.getRed() +  (int)(colorPercentage * dRed);
				int resultGreen = color1.getGreen() +  (int)(colorPercentage * dGreen);
				int resultBlue = color1.getBlue() + (int)( colorPercentage * dBlue);
				
				paintColor = new Color(	resultRed,resultGreen,resultBlue);
			}
			
			/**
			 * Starting position x of the bar
			 */
			int barX = (int) (cps.getPosition().x - controller.getScaleDiv2() - scalediv20);
			
			/**
			 * Starting position y of the bar
			 */
			int barY = (int) (cps.getPosition().y - controller.getScaleDiv2() + controller.getScale() + 1);
			
			/**
			 * if object should be replaced -> move bar below the ReplacementIndicator
			 */
			if(mayBeReplaced==cps) barY += 3;
			
			/**
			 * Width of the bar
			 */
			int barWidth = (int) (controller.getScale() + ((scalediv20) * 2) - 1);
			
			/**
			 * Height of the bar 
			 */
			int barHeight = (int) (controller.getScale() / 5);

			/** 
			 * draw Rectangle below the image 
			 */
			g2.setStroke(new BasicStroke(1));
			g2.drawRect(barX, barY, barWidth, barHeight);
				
			g2.setColor(paintColor);

			/** fill it accordingly if filled partially */
			if (percentage < 1)
				g2.fillRect(barX + 1, barY + 1, (int) ((barWidth - 1) * percentage), barHeight - 1);
			else /** over supplied / supplied bar should be fully filled */
				g2.fillRect(barX + 1, barY + 1, (int) (barWidth - 1), barHeight - 1);
			
			/** write percentage */
			if(percentage>1)
				g2.setColor(Color.WHITE);
			else
				g2.setColor(Color.BLACK);
			
			/** original font */
			Font oldFont = g2.getFont();
			
			g.setFont(new Font("TimesRoman", Font.PLAIN, (int) (barHeight * 1.5) - 2));
			
			String percentageString = (Math.round((percentage * 100))) + "%";
			int stringWidth = (int) g2.getFontMetrics().getStringBounds(percentageString, g2).getWidth();
			g2.drawString(percentageString, barX + barWidth / 2 + 1 - stringWidth / 2, barY + barHeight);
	
			/** recover Font and Color */
			g2.setFont(oldFont);
			g2.setColor(Color.BLACK);
				
		}
	}

	void setEdgePictureAndHighlighting(AbstractCpsObject cps) {
		// node image
		if (cps instanceof CpsNode && (cps == tempCps || model.getSelectedCpsObject() == cps
				|| model.getSelectedCpsObjects().contains(cps) || tempSelected.contains(cps))) {
			img = Util.loadImage("/Images/node_selected.png");
		} else {
			if (cps instanceof HolonSwitch) {//TODO: What the hell are thes ecalls doing here?
				if (((HolonSwitch) cps).getState(model.getCurIteration())) {
					((HolonSwitch) cps).setAutoState(true);
				} else {
					((HolonSwitch) cps).setAutoState(false);
				}
			}
			// Highlighting
			if ((cps == tempCps && model.getSelectedCpsObjects().size() == 0 && tempSelected.size() == 0)
					|| model.getSelectedCpsObjects().contains(cps) || tempSelected.contains(cps)) {
				/**
				 * draw selected Blue Frame
				 */
				g2.setColor(Color.BLUE);
				g2.fillRect((int) (cps.getPosition().x - controller.getScaleDiv2() - scalediv20),
						(int) (cps.getPosition().y - controller.getScaleDiv2() - scalediv20),
						(int) (controller.getScale() + (scalediv20 * 2)),
						(int) (controller.getScale() + (scalediv20 * 2)));
				/**
				 * 
				 */
				if(cps instanceof HolonObject){
					g2.setColor(((HolonObject)cps).getColor());
					g2.fillRect((int) (cps.getPosition().x - controller.getScaleDiv2() - scalediv20+3),
							(int) (cps.getPosition().y - controller.getScaleDiv2() - scalediv20+3),
							(int) (controller.getScale() + (scalediv20 * 2)-6),
							(int) (controller.getScale() + (scalediv20 * 2)-6));					
				}
				
				if (showedInformation[1] && cps instanceof HolonObject) {
					g2.setColor(Color.BLACK);
					float totalEnergy = ((HolonObject) cps).getCurrentEnergyAtTimeStep(model.getCurIteration());
					g2.drawString(Float.toString(totalEnergy), cps.getPosition().x - controller.getScaleDiv2(),
							cps.getPosition().y - controller.getScaleDiv2() - 10);
				}else if (showedInformation[1] && cps instanceof HolonBattery)
                {
                	g2.setColor(Color.BLACK);
                    g2.drawString(((HolonBattery) cps).getCanvasBatteryString(model.getCurIteration()), cps.getPosition().x - controller.getScaleDiv2(),
                            cps.getPosition().y - controller.getScaleDiv2() - 10);
                }
			} else if (cps instanceof HolonObject) {
				g2.setColor(((HolonObject) cps).getColor());

				g2.fillRect((int) (cps.getPosition().x - controller.getScaleDiv2() - scalediv20),
						(int) (cps.getPosition().y - controller.getScaleDiv2() - scalediv20),
						(int) (controller.getScale() + (scalediv20 * 2)),
						(int) (controller.getScale() + (scalediv20 * 2)));

				if (showedInformation[1]) {
					g2.setColor(Color.BLACK);
					float totalEnergy = ((HolonObject) cps).getCurrentEnergyAtTimeStep(model.getCurIteration());
					g2.drawString(Float.toString(totalEnergy), cps.getPosition().x - controller.getScaleDiv2(),
							cps.getPosition().y - controller.getScaleDiv2() - 10);
				}
			}else if (cps instanceof HolonBattery) {
                if (showedInformation[1]) {
                	g2.setColor(Color.BLACK);
                    g2.drawString(((HolonBattery) cps).getCanvasBatteryString(model.getCurIteration()), cps.getPosition().x - controller.getScaleDiv2(),
                            cps.getPosition().y - controller.getScaleDiv2() - 10);
                }
            }
			// set image
			if(cps instanceof HolonBattery)
			{
				img = Util.loadImage(((HolonBattery) cps).getImageBattery());
			}else
			{
				img = Util.loadImage(cps.getImage());
			}
		}
	}

	void drawMarker() {
		if (sx > x && sy > y) {
			g2.drawRect(x, y, sx - x, sy - y);
		} else if (sx < x && sy < y) {
			g2.drawRect(sx, sy, x - sx, y - sy);
		} else if (sx >= x) {
			g2.drawRect(x, sy, sx - x, y - sy);
		} else if (sy >= y) {
			g2.drawRect(sx, y, x - sx, sy - y);
		}
	}

	void showTooltip(Graphics g) {
		if (toolTip) {
			g2.setColor(new Color(255, 225, 150));
			g2.setStroke(new BasicStroke(1));
			int textWidth = g.getFontMetrics().stringWidth(toolTipText) + 2; // Text
			// width

			// fixed x and y Position to the screen
			int fixXPos = toolTipPos.x - (textWidth >> 1) + model.getScaleDiv2();
			int fixYPos = toolTipPos.y;

			if (fixXPos < 0) {
				fixXPos = 0;
			} else if (fixXPos + textWidth + 1 > this.getWidth()) {
				fixXPos -= (fixXPos + textWidth + 1) - this.getWidth();
			}
			if (fixYPos + 16 > this.getHeight()) {
				fixYPos -= (fixYPos + 16) - this.getHeight();
			}
			g2.fillRect(fixXPos, fixYPos, textWidth, 15);
			g2.setColor(Color.BLACK);
			g2.drawRect(fixXPos, fixYPos, textWidth, 15);
			g2.drawString(toolTipText, fixXPos + 2, fixYPos + 12);
		}
	}

	void setConsoleTextAfterSelect(AbstractCpsObject cps) {
		if (model.getShowConsoleLog()) {
			controller.addTextToConsole("Selected: ", Color.BLACK, 12, false, false, false);
			controller.addTextToConsole("" + cps.getName(), Color.BLUE, 12, true, false, false);
			controller.addTextToConsole(", ID:", Color.BLACK, 12, false, false, false);
			controller.addTextToConsole("" + cps.getId(), Color.RED, 12, true, false, true);
		}
	}

	void setRightClickMenu(MouseEvent e) {
		if (e.getButton() == MouseEvent.BUTTON3) {
			itemPaste.setEnabled(true);
			if (tempCps != null) {
				itemPaste.setEnabled(true);
				itemDelete.setEnabled(true);
				itemCut.setEnabled(true);
				itemCopy.setEnabled(true);
				itemAlign.setEnabled(true);
				// tracking
				if (tempCps != null) {
					itemGroup.setEnabled(true);
					itemTrack.setEnabled(true);
					itemUntrack.setEnabled(true);
				}
				// ungrouping
				if (tempCps instanceof CpsUpperNode)
					itemUngroup.setEnabled(true);
				else
					itemUngroup.setEnabled(false);
				if (model.getSelectedCpsObjects().size() == 0) {
					controller.addSelectedObject(tempCps);
				}
				if (tempCps instanceof HolonObject) {
					itemCreateTemplate.setEnabled(true);
				} else {
					itemCreateTemplate.setEnabled(false);
				}
			} else {
				itemAlign.setEnabled(false);
				itemCut.setEnabled(false);
				itemCopy.setEnabled(false);
				itemGroup.setEnabled(false);
				itemUngroup.setEnabled(false);
				itemTrack.setEnabled(false);
				itemUntrack.setEnabled(false);
				itemCreateTemplate.setEnabled(false);
				if (edgeHighlight != null) {
					itemDelete.setEnabled(true);
					itemPaste.setEnabled(false);
				} else {
					itemDelete.setEnabled(false);
					itemPaste.setEnabled(true);
				}
			}
			mousePosition = this.getMousePosition();
			popmenu.show(e.getComponent(), e.getX(), e.getY());
		}
	}

	void markObjects() {
		if (doMark) {
			doMark = false;
			for (AbstractCpsObject cps : tempSelected) {
				if (!model.getSelectedCpsObjects().contains(cps)) {
					controller.addSelectedObject(cps);
				}
			}
			controller.getObjectsInDepth();
			tempSelected.clear();
		}
	}


	int[] determineMousePositionOnEdge(CpsEdge p) {
		int lx, ly, hx, hy;

		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;
		}

		return new int[] { lx, ly, hx, hy };
	}

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

	boolean setToolTipInfoAndPosition(boolean on, AbstractCpsObject cps) {
		if (x - controller.getScale() <= cx && y - controller.getScale() <= cy && x >= cx && y >= cy) {
			on = true;
			toolTipPos.x = cps.getPosition().x - controller.getScaleDiv2();
			toolTipPos.y = cps.getPosition().y + controller.getScaleDiv2();
			toolTipText = cps.getName() + ", " + cps.getId();
		}

		return on;
	}

	abstract void drawDeleteEdge();

	void triggerUpdateController() {
		updCon.paintProperties(tempCps);
		updCon.refreshTableHolonElement(model.getMultiTable(), model.getSingleTable());
		updCon.refreshTableProperties(model.getPropertyTable());
	}
	
	
	/**
	 * Checks if {@code draggedCps} or a new cpsObject at Position (x,y) could replace exactly one object
	 * in {@code objects}.
	 * Saves the object that would be replaced in {@link AbstractCanvas}.{@code MayBeReplaced}
	 * @param objects list of objects that could be replaced
	 * @param draggedCps Object that might replace
	 * @param x Position of the objects that might replace
	 * @param y Position of the objects that might replace
	 * @return true if exactly one Object could be replaced 
	 */
	protected boolean checkForReplacement(ArrayList<AbstractCpsObject> objects, AbstractCpsObject draggedCps, int x, int y){
		
		/** distance treshold for replacement */
		int treshhold = controller.getScale()/2;
						
		/** number of Objects that might be replaced (should be 1) */
		int replaceCounter = 0;
		
		/** last object that could be replaced */
		AbstractCpsObject toBeReplaced = null;
		
		/** Position of object that might be replaced */
		Position p;
		
		/** for each cps on Canvas */
		if(draggedCps == null || !(draggedCps instanceof CpsNode) && !(draggedCps instanceof CpsNode)){
			for (AbstractCpsObject cps : objects){
				/** same object -> ignore */
				if(cps == draggedCps)continue;
						
				/** set Position of object that might be replaced */
				p = cps.getPosition();
				
				/** if near enough */
				if(Math.abs(x-p.x)<treshhold && Math.abs(y-p.y)<treshhold){
					replaceCounter++;
					toBeReplaced = cps;
					
					/**
					 * if too many Objects could be replaced:
					 * stop searching, because it would not be clear which one should
					 * be replaced
					 */
					if(replaceCounter>1)break;
				}
			}
		}
		/**
		 * return true if exactly one obect would be replaced
		 */
		if( replaceCounter == 1 && toBeReplaced != null){
			mayBeReplaced = toBeReplaced;
			return true;
		}else{
			mayBeReplaced = null;
			return false;
		}
	}
	
	/**
	 * Checks if an inserted new Object could replace exactly one object on the canvas.
	 * Saves the object that would be replaced in {@link AbstractCanvas}.{@code MayBeReplaced}
	 * @param x Position of the objects that might replace
	 * @param y Position of the objects that might replace
	 * @return true if exactly one Object could be replaced 
	 */
	public abstract boolean checkForReplacement(int x, int y);
	
		
	/**
	 * highlights the object that mayBeReplaced
	 * @param g2
	 */
	protected void highlightMayBeReplaced(Graphics2D g2) {
		if(mayBeReplaced != null){
			g2.setColor(Color.RED);
			g2.fillRect(
					(int) (mayBeReplaced.getPosition().x
							- controller.getScaleDiv2() - (scalediv20 + 3)),
					(int) (mayBeReplaced.getPosition().y
							- controller.getScaleDiv2() - (scalediv20 + 3)),
					(int) (controller.getScale() + ((scalediv20 + 3) * 2)),
					(int) (controller.getScale() + ((scalediv20 + 3) * 2)));
		}
	}
	
	/**
	 * Align alle Objects on the Canvas to a Grid with objects every 10 pixels
	 */
	public abstract void tryToAlignObjects();

	/**
	 * Aligns the Object the a grid
	 * @param cps Object that should be aligned
	 * @param distance distance between the AlignmentGrid Lines. (objects every 'distance' pixels
	 */
	protected void align(AbstractCpsObject cps, int distance) {
		/** Position of the AbstractCpsObject which should be aligned */
		Position p = cps.getPosition();
		
		//calculate how many pixels the cps should be decreased to align
		/** x offset relative to a grid with lines every distance pixels */
		int x_off = cps.getPosition().x % distance;
		
		/** y offset relative to a grid with lines every distance pixels */
		int y_off = cps.getPosition().y % distance;
		
		//align to the other Line, if it is nearer
		if(x_off > distance/2)
			x_off -= distance;
		if(y_off > distance/2)
			y_off -= distance;
		
		/** set new Position */
		cps.setPosition(p.x-x_off, p.y-y_off);
	}
	
	/**
	 * Stops Editing in HolonElementTable and PropertyTable
	 */
	protected void stopEditing() {
		/**
		 * Stop Editing, if mouse exits the Table
		 */
		JTable holElem = model.getTableHolonElement();
		CellEditor cellEditor = holElem.getCellEditor();
		if (cellEditor != null) {
		    if (cellEditor.getCellEditorValue() != null) {
		    	/** TODO: Maybe try to save current Data */
		        cellEditor.stopCellEditing();
		    } else {
		        cellEditor.cancelCellEditing();
		    }
		}
		
		JTable propertys = model.getTableProperties();
		cellEditor = propertys.getCellEditor();
		if (cellEditor != null) {
		    if (cellEditor.getCellEditorValue() != null) {
		    	/** TODO: Maybe try to save current Data */
		        cellEditor.stopCellEditing();
		    } else {
		        cellEditor.cancelCellEditing();
		    }
		}
	}

	/**
	 * Closes a tab of the UpperNode with ID upperNodeID
	 * @param upperNodeId
	 */
	public abstract void closeUpperNodeTab(int upperNodeId);
}