The document provides code for a Java GUI application that allows users to draw shapes and characters using mouse interactions. It includes functionalities to control line thickness with a JSlider, choose colors with a JColorChooser, and set fonts for text. The main components consist of a JFrame, JPanel, and buttons for selecting shapes to draw on the canvas.

1. I need help creating a java gui that draws lines, shapes, characters in response to mouseDragged,
mousePressed, keyTyped. The user should be able to control the size using a Jslider, and control
the color of all the shapes, lines, and letters using JcolorChooser and be able to control the Font
of the letters.
Solution
import java.awt.*; import java.awt.event.*; import javax.swing.*; public class DPanel
extends JFrame { private DObjects panel = new DObjects(); private JPanel BPanel = new
JPanel(); private JFrame window = new JFrame(); DPanel(){ buildGUI(); }
void buildGUI(){ window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setLayout(new GridLayout(2,2)); window.add(panel); window.add(BPanel);
BPanel.setBackground(Color.blue); //define buttons and add to panel JButton rect
= new JButton("Rect"); JButton oval = new JButton("Oval"); BPanel.add(rect);
BPanel.add(oval); rect.addActionListener(new ActionListener() { public void
actionPerformed(ActionEvent e) { panel.setType(1); } });
oval.addActionListener(new ActionListener() { public void
actionPerformed(ActionEvent e) { panel.setType(2); } });
window.setVisible(true); window.setSize(1024, 800); } public static void
main(String[] args) { new DPanel(); } } import java.awt.*; import
java.awt.event.*; import javax.swing.*; class DObjects extends JPanel { public int
x1,x2,y1,y2; public int type = 1; public DObjects() { init(); } public void init(){
setBackground(Color.WHITE); addMouseListener(new MouseAdapter() {
public void mousePressed(MouseEvent m) { x1 = m.getX(); y1 =
m.getY(); repaint(); } public void mouseReleased(MouseEvent m)
{ x2 = m.getX(); y2 = m.getY(); repaint(); } });
addMouseMotionListener(new MouseMotionAdapter() { public void
mouseDragged(MouseEvent m) { x2 = m.getX(); y2 =
m.getY(); repaint(); } }); } public void setType(int arg){
if(arg == 1){ type = 1; }else if(arg == 2){ type = 2; } } public void
paintComponent(Graphics g) { super.paintComponent(g); if(type == 1) {
g.drawRect(x1,y1,x2,y2); } else if (type == 2) {
g.drawOval(x1,y1,x2,y2); } } }