A Paint Application with Combo Boxes and Buttons

Greenhorn

Posts: 1

posted 17 years ago

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Good Day! I will like someone to help me out in making this code to function in the same pattern I have written it. I am stucked with the issue of changing from one shape to another by clicking on the named shape button. For example, if there is a rectangle shape already on the frame, I cannot draw another shape by clicking on another button to draw a circle. I will be happy to welcome any correction.
Thanks for your assistance.

Alam Winner

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import java.applet.*;

//<html><APPLET CODE = "ColorApplication.class"  HEIGHT = "500"  WIDTH = "600"></APPLET>
 
class PaintApplication extends JApplet implements ActionListener
{
 
static JFrame frame;
static JPanel panel;
 
JLabel Title;
JButton r, c, p, e;
JLabel Lcolor;
JLabel Fcolor;
JComboBox SLcolor;
JComboBox SFcolor;
String[] CLcolor={"CHOOSE LINE COLOR","Blue","Red","Yellow","Green"};
String[] CFcolor={"CHOOSE FILL COLOR","Blue","Red","Yellow","Green"};
 
public PaintApplication()
{
panel = new JPanel();
frame=new JFrame("USER-DEFINED PAINT APPLICATION FOR DESIGNERS");
frame.setVisible(true);
frame.setSize(500,400);
frame.setResizable(true);
frame.getContentPane().add(panel);
 r = new JButton("RECTANGLE");
 c = new JButton ("CIRCLE");
 p = new JButton("POLYGON");
 e = new JButton("ELLIPSE");
frame.getContentPane().setLayout(new BorderLayout());
 
JPanel TP=new JPanel();
TP.setLayout(new FlowLayout(FlowLayout.CENTER));
TP.add(new JLabel("MY PAINT APPLICATION."));

JPanel panel1=new JPanel();
panel1.setLayout(new FlowLayout(FlowLayout.CENTER,10,40));
panel1.add(r);
panel1.add(c);
panel1.add(p);
panel1.add(e);

JPanel TP1=new JPanel();
TP1.setLayout(new BorderLayout());
TP1.add(TP,BorderLayout.NORTH);
TP1.add(panel1,BorderLayout.CENTER);

JPanel panel2=new JPanel();
panel2.setLayout(new FlowLayout(FlowLayout.CENTER,30,2));
Lcolor = new JLabel("SELECT LINE COLOR");
Fcolor = new JLabel("SELECT FILL COLOR");
panel2.add(Lcolor);
panel2.add(Fcolor);

JPanel panel3=new JPanel();
panel3.setLayout(new FlowLayout(FlowLayout.CENTER,30,2));
SLcolor = new JComboBox(CLcolor);
panel3.add(SLcolor);
SFcolor = new JComboBox(CFcolor);
panel3.add(SFcolor);

JPanel panel4=new JPanel();
panel4.setLayout(new BorderLayout());
panel4.add(panel2,BorderLayout.NORTH);
panel4.add(panel3,BorderLayout.CENTER);

frame.getContentPane().add(TP1,BorderLayout.NORTH);
frame.getContentPane().add(panel4,BorderLayout.CENTER);
r.addActionListener(this);
c.addActionListener(this);
p.addActionListener(this);
e.addActionListener(this);
}

public void actionPerformed(ActionEvent ae)
{
Object source = ae.getSource();
String s = ae.getActionCommand();
 
if(ae.getSource()==r);
{
SLcolor.getSelectedItem();
new ColorApplication();
}
}
}
 
public class ColorApplication extends Applet
{
public void paint(Graphics g)
{
g.setColor(Color.blue);
g.draw3DRect(100, 100, 100, 70,true);
}
 
public static void main(String args[])
{
new PaintApplication();
}
}

Although, I have not done any thing with the combo boxes in the code. I was only testing the buttons

Craig Wood

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Posts: 1535

posted 17 years ago

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These are complex things to put together. Here's some food for thought.

//  <applet code = "ColorApp" height="500" width="600"></applet>
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import javax.swing.*;
import javax.swing.event.MouseInputAdapter;
 
public class ColorApp extends JApplet implements ActionListener
{
    JButton r, c, p, e;
    JComboBox SLcolor;
    JComboBox SFcolor;
    String[] colorNames={ "Blue", "Red", "Yellow", "Green" };
    Color[] colors={ Color.blue, Color.red, Color.yellow, Color.green };
    ColorAppletPanel colorPanel;
 
    public void init()
    {
        r = new JButton("RECTANGLE");
        c = new JButton ("CIRCLE");
        p = new JButton("POLYGON");
        e = new JButton("ELLIPSE");
 
        JPanel TP=new JPanel();
        TP.setLayout(new FlowLayout(FlowLayout.CENTER));
        TP.add(new JLabel("MY PAINT APPLICATION."));
 
        JPanel panel1=new JPanel();
        panel1.add(r);
        panel1.add(c);
        panel1.add(p);
        panel1.add(e);
 
        JPanel TP1=new JPanel();
        TP1.setLayout(new BorderLayout());
        TP1.add(TP,BorderLayout.NORTH);
        TP1.add(panel1,BorderLayout.SOUTH);
 
        JPanel panel2=new JPanel();
        panel2.setLayout(new FlowLayout(FlowLayout.CENTER,30,2));
        JLabel Lcolor = new JLabel("SELECT LINE COLOR");
        JLabel Fcolor = new JLabel("SELECT FILL COLOR");
        panel2.add(Lcolor);
        panel2.add(Fcolor);
 
        JPanel panel3=new JPanel();
        panel3.setLayout(new FlowLayout(FlowLayout.CENTER,30,2));
        SLcolor = new JComboBox(colorNames);
        panel3.add(SLcolor);
        SFcolor = new JComboBox(colorNames);
        panel3.add(SFcolor);
 
        JPanel panel4=new JPanel();
        panel4.setLayout(new BorderLayout());
        panel4.add(panel2,BorderLayout.NORTH);
        panel4.add(panel3,BorderLayout.CENTER);
 
        colorPanel = new ColorAppletPanel();
 
        getContentPane().setLayout(new BorderLayout());
        getContentPane().add(TP1,BorderLayout.NORTH);
        getContentPane().add(panel4,BorderLayout.SOUTH);
        getContentPane().add(colorPanel, BorderLayout.CENTER);
        r.addActionListener(this);
        c.addActionListener(this);
        p.addActionListener(this);
        e.addActionListener(this);
    }
 
    public void actionPerformed(ActionEvent ae)
    {
        Object source = ae.getSource();
        if(source == r)
            colorPanel.setType(ColorAppletPanel.RECT);
        if(source == c)
            colorPanel.setType(ColorAppletPanel.CIRCLE);
        if(source == p)
            colorPanel.setType(ColorAppletPanel.POLYGON);
        if(source == e)
            colorPanel.setType(ColorAppletPanel.ELLIPSE);
    }
 
    public static void main(String[] args)
    {
        JApplet applet = new ColorApp();
        JFrame frame=new JFrame("USER-DEFINED PAINT APPLICATION FOR DESIGNERS");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(500,400);
        frame.setResizable(true);
        frame.getContentPane().add(applet);
        frame.setLocation(100,50);
        applet.init();
        frame.setVisible(true);
    }
}
 
class ColorAppletPanel extends JPanel
{
    PanelListener pl;
    Shape[] shapes = new Shape[0];
    Color color = Color.blue;
    final static int RECT    = 0;
    final static int CIRCLE  = 1;
    final static int POLYGON = 2;
    final static int ELLIPSE = 3;
    int shapeType = RECT;
    Shape liveShape;
 
    public ColorAppletPanel() {
        pl = new PanelListener(this);
        addMouseListener(pl);
        addMouseMotionListener(pl);
    }
 
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setPaint(color);
        for(int j = 0; j < shapes.length; j++)
            g2.draw(shapes[j]);
        g2.setPaint(Color.red);
        if(pl.dragging)
            g2.draw(liveShape);
    }
 
    public void setLiveShape(Point start, Point end)
    {
        liveShape = getShape(start, end);
        repaint();
    }
 
    public void addShape(Point start, Point end)
    {
        Shape shape = getShape(start, end);
        if(shape != null)
            addToShapes(shape);
    }
 
    private void addToShapes(Shape shape)
    {
        Shape[] temp = new Shape[shapes.length+1];
        System.arraycopy(shapes, 0, temp, 0, shapes.length);
        temp[temp.length-1] = shape;
        shapes = temp;
        repaint();
    }
 
    private Shape getShape(Point start, Point end)
    {
        Shape shape = null;
        Rectangle r = getRectangle(start, end);
        switch(shapeType)
        {
            case RECT:
                shape = r;
                break;
            case CIRCLE:
                int d = Math.min(r.width, r.height);
                double cx = r.getCenterX();
                double cy = r.getCenterY();
                double x = cx - d/2;
                double y = cy - d/2;
                shape = new Ellipse2D.Double(x, y, d, d);
                break;
            case POLYGON:
                // ...
                break;
            case ELLIPSE:
                shape = new Ellipse2D.Double(r.x, r.y, r.width, r.height);
                break;
            default:
                System.out.printf("unexpected shapeType %d%n", shapeType);
        }
        return shape;
    }
 
    private Rectangle getRectangle(Point p1, Point p2)
    {
        Rectangle r = new Rectangle();
        r.setFrameFromDiagonal(p1, p2);
        return r;
    }
 
    public void setType(int type)
    {
        shapeType = type;
    }
 
    public void clear()
    {
        shapes = new Shape[0];
        repaint();
    }
}
 
class PanelListener extends MouseInputAdapter
{
    ColorAppletPanel colorPanel;
    Point start;
    boolean dragging = false;
 
    public PanelListener(ColorAppletPanel cap)
    {
        colorPanel = cap;
    }
 
    public void mousePressed(MouseEvent e)
    {
        start = e.getPoint();
        dragging = true;
    }
 
    public void mouseDragged(MouseEvent e)
    {
        if(dragging)
            colorPanel.setLiveShape(start, e.getPoint());
    }
 
    public void mouseReleased(MouseEvent e)
    {
        dragging = false;
        Point end = e.getPoint();
        if(start.distance(end) > 10)
            colorPanel.addShape(start, end);
    }
}

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