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Thread: Drawing Image in Java

  1. #1
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    Default Drawing Image in Java

    Hello, I add a second button to paint a second image on the screen, however when i select the second radio button it is overriding the first image which was previously drawn. How can i solve this? I want to draw both images.Here is my code

    // class1
     
    import java.awt.*;
    import java.awt.event.MouseAdapter;
    import java.awt.event.MouseEvent;
    import java.awt.image.BufferedImage;
    import java.io.File;
    import java.io.IOException;
    import javax.imageio.ImageIO;
     
     
     
    import java.awt.Dimension;
     
     
     
     
    /**
     *
     * @author User
     */
    public class Buildings {
        private Image img,img2;
        private String s;
        private int b_index;
        private BufferedImage image, offScreenImage;
        private int width,height;
     
     
        private String s_shopping="School";
        private String building="Building";
     
     
     
     
        public Buildings(){
     
            try{
     
                img= ImageIO.read(new File("building.jpg"));
                img2=ImageIO.read(new File("s1.jpg"));
     
            }
            catch(IOException e){
            System.out.println("Image not found");
        }
     
     
        }
     
     
     
     
     
        public void PaintBuilding(Graphics2D  offScreenG2D, int x, int y){
     
            offScreenG2D.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                    RenderingHints.VALUE_ANTIALIAS_ON);
     
            offScreenG2D.drawImage(img, x,y,null);
            offScreenG2D.drawString(building, x+1, y+1);
     
        }
     
    public void PaintSchool(Graphics2D g2d, int x, int y){
     
    	g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                    RenderingHints.VALUE_ANTIALIAS_ON);
     
    	g2d.drawImage(img2, x,y,null);
            g2d.drawString(s_shopping, x+1, y+1);
     
        }
     
     
        public String getString(){
            return s;
        }
     
        public void setString(String s){
            this.s=s;
        }
     
        public void setBIndex(int index){
            this.b_index=index;
        }
     
        public int getBIndex(){
            return b_index;
        }
     
     
    }
     
    //class2
     
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.ItemEvent;
    import java.awt.event.ItemListener;
     
    class BuildingOptions extends JFrame{
    	JRadioButton rb1;
    	JRadioButton rb2;
    	ButtonGroup bgroup;
    	private int build_index;
    	JPanel panelRbutton;
    	// modify the line below to the second line
    	// Buildings build= new Buildings();
    	static Buildings build;
     
    	// modify the constructor as shown
    	public BuildingOptions( Buildings build ){
    		super("Choose a building");
     
    		// add this line:
    		this.build = build;
     
    		build.setBIndex(build_index);
    		rb1= new JRadioButton("Add a School");
    		rb2=new JRadioButton("Add a Shopping Mall");
    		//rb3=new JRadioButton()
    		bgroup= new ButtonGroup();
    		bgroup.add(rb1);
    		bgroup.add(rb2);
    		rb1.addItemListener(new ButtonListener());
    		rb2.addItemListener(new ButtonListener());
    		panelRbutton= new JPanel();
    		panelRbutton.add(rb1);
    		panelRbutton.add(rb2);
    		this.add(panelRbutton);
    		this.setSize(250, 300);
    		this.setBackground(Color.LIGHT_GRAY);
    		this.setVisible(true);
    		repaint();
    	}
    	public class ButtonListener implements ItemListener{
    		public void itemStateChanged(ItemEvent e){
    			if(e.getSource()==rb1){
    				System.out.println("School");
    				build_index=1;
    				build.setBIndex(build_index);
    				repaint();
    				System.out.println("Index here is:"+build.getBIndex());
     
     
     
    			}
    			if(e.getSource()==rb2){
    				System.out.println("Building");
    				build_index=2;
    				build.setBIndex(build_index);
    				repaint();
    				System.out.println("Index here is:"+build.getBIndex());
     
     
     
    		}
    	}
    	// commented out main() method to avoid confusion:
    	/*
    	public static void Main(String [] args){
    		BuildingOptions frame1= new BuildingOptions(build);
    		frame1.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		frame1.setVisible(true);
    	}*/ 
     
    	}
    }
     
     
    //class3
     
    import javax.swing.*;
     
    //import Buildings.MouseDrag;
     
     
     
    import java.awt.*;
    import java.awt.event.ActionEvent;
    import java.awt.event.ActionListener;
    import java.awt.event.MouseAdapter;
    import java.awt.event.MouseEvent;
     
     
     
    public class MainDrawing extends JPanel
    {
    	int id=2;
    	int index;
    	int height, width, x,y;
    	// this creates Object1-A, 'b'
    	Buildings b= new Buildings();
    	boolean buildingS=false;
    	JButton b1;
    	BuildingOptions bOpt;
    	MouseDrag mouseDrag;
    	public MainDrawing()
    	{
    		index=index;
    		this.setBackground(Color.white);
    		this.setSize(300,150);
    		//mouseDrag = new MouseDrag();
           // addMouseListener(mouseDrag);
            //addMouseMotionListener(mouseDrag);
    		// b.setBIndex(index);
    		b1=new JButton("Add Buildings");
    		b1.setSize(25, 50);
    		b1.addActionListener(new ButtonListener());
    		add(b1);
    		  mouseDrag = new MouseDrag();
    	      addMouseListener(mouseDrag);
    	      addMouseMotionListener(mouseDrag);    
     
    	    }
     
     
    	    private final class MouseDrag extends MouseAdapter {
    	        private boolean dragging = false;
    	        private Point last;
     
    	        @Override
    	        public void mousePressed(MouseEvent m) {
    	            last = m.getPoint();
    	           // dragging = isInsideEllipse(last);
    	            if (!dragging) {
    	                x = last.x;
    	                y = last.y;
    	                width = 0;
    	                height = 0;
    	            }
    	         //   repaint();
    	        }
     
    	        @Override
    	        public void mouseReleased(MouseEvent m) {
    	            //last = null;
    	            dragging = true;
    	           repaint();
    	        }
     
    	        @Override
    	        public void mouseDragged(MouseEvent m) {
    	            int dx = m.getX() - last.x;
    	            int dy = m.getY() - last.y;
    	            if (dragging) {
    	                x += dx;
    	                y += dy;
    	            } else {
    	                width += dx;
    	                height += dy;
    	            }
    	            last = m.getPoint();
    	            repaint();
    	        }
    	    }
     
     
    	public void paint(Graphics g){
    		super.paint(g);
    		Graphics2D g2d=(Graphics2D)g;
    		System.out.println("Index is:"+b.getBIndex());
    		if(b.getBIndex()==1)
     
    			b.PaintSchool(g2d, x, y);
    		if(b.getBIndex()==2)
     
    			b.PaintBuilding(g2d, x, y);
    	}
     
    	public class ButtonListener implements ActionListener{
    		public void actionPerformed(ActionEvent e) {
    			if(e.getSource()==b1)
    				// this creates Object2, passing a reference to Object1-A
    				bOpt= new BuildingOptions( b );
    			bOpt.setVisible(true);
    			bOpt.setSize(250, 250);
    			System.out.println("Index in button listener in class buttonListener:"+b.getBIndex());
    			repaint();
    			/*index=1;
    // buildingS=true;
    b.setBIndex(index);
    repaint();
    System.out.println("Index:"+b.getBIndex());*/
    		}
    	}
     
     
    	public static void main(String args[]){
    		MainDrawing md= new MainDrawing();
    		JFrame f=new JFrame();
    		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		//f.setBackground(Color.yellow);
    		f.setContentPane(md);
    		f.setVisible(true);
    		f.setSize(350,350);
    		f.setVisible(true);
    	}
    }


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Drawing Image in Java

    Every time the paint() method in the code is called, it completely repaints what is on the screen.
    If you want multiple shapes to be drawn, you will have to draw them each time.

    There are other techniques that you could use to preserve what was drawn before: create an image that is saved in the class, draw on it as desired and then draw the current contents of the image in the paint() method.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Drawing Image in Java

    How can i create an image that is saved in the class? I tried using BufferedImage instead of Image and i include this :
     
     public void PaintBuilding(Graphics2D  offScreenG2D, int x, int y){
     
            offScreenG2D.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
     
            offScreenG2D.drawImage(img, x,y,null);
            offScreenG2D.drawString(building, x+1, y+1);
     
        }
     
    public void PaintSchool(Graphics2D g2d, int x, int y){
     
    	g2d.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
     
    	g2d.drawImage(img2, x,y,null);
            g2d.drawString(s_shopping, x+1, y+1);
     
        }
    however the problem is still persisting, i can draw 2 different images, and as soon as i click on the button, the image drawn is disappeared.
    Last edited by Norm; March 15th, 2013 at 01:11 PM. Reason: added / to ending code tag

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: Drawing Image in Java

    Please make a small simple complete program that compiles, executes and shows the problem.

    Pseudo code:
    create image
    begin EVENT loop
    wait for event
    draw next shape on image
    call repaint()
    in the painting method, draw the image with the shapes on the Graphics context
    end loop
    If you don't understand my answer, don't ignore it, ask a question.

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