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circuitworks

circuitworks. First prototype: mouselistener draws triangles wherever clicked. Coordinates are recorded. 2 nd prototype: GUI with inverters & and-gates using mouselistener. Saving coordinates. 3 rd prototype: saving graph Read/writeObjects. import java.io.*; import java.awt.*;

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circuitworks

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  1. circuitworks

  2. First prototype: mouselistener draws triangles wherever clicked

  3. Coordinates are recorded

  4. 2nd prototype: GUI with inverters & and-gates using mouselistener

  5. Saving coordinates

  6. 3rd prototype: saving graph Read/writeObjects import java.io.*; import java.awt.*; public class Circuit3{ public static void main(String args[]){ CircuitThingy z=new CircuitThingy(); CircuitThingy m=new CircuitThingy(); System.out.println("Color is"+z.getColor()); z.setColor(Color.orange); try{ FileOutputStream fos = new FileOutputStream("tmp.txt"); ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeObject(z); oos.close(); FileInputStream fis=new FileInputStream("tmp.txt"); ObjectInputStream objin=new ObjectInputStream(fis); m=(CircuitThingy)objin.readObject(); objin.close();} catch(ClassNotFoundException cnfe) {} catch (IOException e){} int []r=m.getX(); for(int j=0;j<r.length;j++)System.out.println("coordinate "+j+"="+r[j]); System.out.println("Color is"+m.getColor()); }//main }

  7. CircuitThingy object import java.io.*; import java.awt.*; public class CircuitThingy implements Serializable{ int []x; int[]y; Color p; public CircuitThingy(){ x=new int[5]; x[0]=0;x[1]=33;x[2]=44;x[3]=777;x[4]=901; y=new int[5]; y[0]=10;y[1]=332;y[2]=404;y[3]=717;y[4]=9101; p=Color.red;} public void setColor(Color c){p=c;} public int[]getX(){ return x;} public Color getColor(){return p;} }

  8. 4th prototype: mouseclick puts rectangles

  9. 4th prototype: Entering connections

  10. Blackscreen log of rectangles and connections

  11. 4th prototype display of circuit with crude wiring

  12. 4th prototype: Processing graph using topological sort

  13. Fields in Applet Point rectangles[]; Point input[],output[]; int boxcount=-1; String connect=""; Point start[],end[]; int connections=-1; JButton calculate; PicturePanel view; JButton b; Graph g=new Graph();

  14. output

  15. Prototypes have limited functionality • I only processed a few kinds of gates (NAND and NOR – I think) and gate type was determined by odd-even count parity, not user input. • No proper gate representation was provided • Wiring wasn’t easy or pretty • No undo/redo was provided • No proper debugging occurred • No proper display of circuit execution occurred.

  16. Double buffering…an image on a JPanel • I used two classes, a BufPanel (extends JPanel) and a JFrame. • Basically, you get an image, X. • Then get the graphics associated with that image, GX • Whatever you write using GX goes on X. • Then in your (usual) paint method you just call g.drawImage(X,…)

  17. JFrame import javax.swing.*; import java.awt.*; public class DoubleBuf extends JFrame {BufPanel p; public static void main(String args[]) { DoubleBuf cd = new DoubleBuf (); } public DoubleBuf () {setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); System.out.println("init()"); this.setBounds(0,0,800,600); Container c = getContentPane(); p=new BufPanel(); c.setLayout(new BorderLayout()); c.add(p, BorderLayout.CENTER); this.setVisible(true); }}

  18. JPanel import javax.swing.JPanel; import java.awt.*; import java.awt.event.*; public class BufPanel extends JPanel { int x,y; private int bufferWidth; private int bufferHeight; private Image bufferImage; private Graphics bufferGraphics; public BufPanel(){ super();}//cal super for panel public void paint(Graphics g){ // checks the buffersize with the current panelsize // or initialises the image with the first paint if(bufferWidth!=getSize().width || bufferHeight!=getSize().height || bufferImage==null || bufferGraphics==null) resetBuffer(); if(bufferGraphics!=null){

  19. Here the buffered image is drawn //this clears the offscreen image, not the onscreen one bufferGraphics.clearRect(0,0,bufferWidth,bufferHeight); //calls the paintbuffer method with //the offscreen graphics as a param paintBuffer(bufferGraphics); //we finaly paint the offscreen image onto the onscreen g.drawImage(bufferImage,0,0,this); } }

  20. More of the panel stuff public void paintBuffer(Graphics g){ /// g is the offscreen graphics g.setColor(Color.red); g.fillOval(30,30,100,100); g.setColor(Color.blue); g.fillOval(50,50,50,50); g.setColor(Color.green); g.fillOval(60,60,25,25); } private void resetBuffer(){ ////////////////you can cut most of this // always keep track of the image size bufferWidth=getSize().width; bufferHeight=getSize().height; // clean up the previous image if(bufferGraphics!=null){ bufferGraphics.dispose(); bufferGraphics=null; } if(bufferImage!=null){ bufferImage.flush(); bufferImage=null; } System.gc(); // create the new image with the size of the panel….need this part!!!!!! bufferImage=createImage(bufferWidth,bufferHeight); bufferGraphics=bufferImage.getGraphics(); } }//class

  21. Double buffering…an image on a JPanel…code in slide notes

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