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Datei: View.java Sprache: JAVA

Original von: VDM^©

package gui;

import java.awt.*;
import java.io.IOException;
import java.util.*;
import java.util.List;

import javax.swing.JPanel;

import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.event.ComponentEvent;

class View extends JPanel implements Observer {

private static final long serialVersionUID = 1L;

    Model model;

    private List<Rectangle> cells;
    private List<Object> liveCells;

    private int sideCount;
    int sideSplit;
    int cellCount;
    int zerozero;

    int simulationRoundCount;

    int cellWidth;
    int cellHeight;

    int xOffset;
    int yOffset;

    View(Model model, int cellSideCount) throws IOException {
        this.model = model;
        this.setLayout(null);
        this.setBackground(Color.WHITE);

        sideCount = cellSideCount;
        cellCount = sideCount * sideCount;
        sideSplit = sideCount / 2;
        zerozero = (sideCount % 2 == 0 ? -sideSplit  + (cellCount /2) : (cellCount /2) );

        cells = new ArrayList<>(cellCount);
        liveCells = Collections.synchronizedList(new ArrayList<>(cellCount));

        simulationRoundCount = 0;

        //resize event
    this.addComponentListener(new java.awt.event.ComponentAdapter() {
     @Override
     public void componentResized(ComponentEvent e) {

             int width = getWidth();
             int height = getHeight();

             cellWidth = width / sideCount;
             cellHeight = height / sideCount;

             xOffset = (width - (sideCount * cellWidth)) / 2;
             yOffset = (height - (sideCount * cellHeight)) / 2;

             rebuildCells();

             invalidate();
     }
    });
    }


    transient Graphics2D g2;
    @Override
    public void paintComponent(Graphics g) {

        super.paintComponent( g );

        g2 = (Graphics2D) g.create();


     synchronized(liveCells){
         for (Object activeCell : liveCells) {
                Rectangle cell = cells.get((int) activeCell);
                g2.setColor(Color.BLACK);
                g2.fill(cell);
         }

         g2.setColor(Color.GRAY);
         for (Rectangle cell : cells) {
             g2.draw(cell);
         }

        }

        Font font = new Font("Arial", Font.PLAIN, 18);
        g2.setFont(font);
        g2.setColor(Color.RED);
        g2.drawString("Round: " + simulationRoundCount , 8,20);

        g2.dispose();
    }

    public void update(Observable obs, Object arg) {

     if(arg == null)
      return;

        if(arg == "newRound")
        {
         simulationRoundCount++;
         liveCells.clear();
         List<Point> list = model.getLivingCells();

         for (Point cord : list) {
          addNewLiveCell(cord.x,cord.y);
   }
        }

        repaint();
    }

    private void addNewLiveCell(int x, int y)
    {
     int index = findIndexFromCoord(x,y);

     if(index > 0)
      liveCells.add(index);
    }

    private int findIndexFromCoord(int x, int y)
    {
     if((x < sideSplit && x >= -sideSplit) && (y < sideSplit && y >= -sideSplit))
     {

      int index = zerozero +  (-y * sideCount) +x;

      if(0 <= index && index < cellCount)
       return index;
     }

     return -1;
    }

private void rebuildCells() {
  cells.clear();
        for (int row = 0; row < sideCount; row++) {
            for (int col = 0; col < sideCount; col++) {
                Rectangle cell = new Rectangle(
                        xOffset + (col * cellWidth),
                        yOffset + (row * cellHeight),
                        cellWidth,
                        cellHeight);
                cells.add(cell);
            }
        }
}
}

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