I'm trying to make a drawing program using a JFrame with a Canvas in it, and there are a couple of other issues with it, but the main one I'm trying to solve right now is how to save the canvas as an image file. I've tried a bunch of different methods I found online but they all just save a transparent screen or something. Please help me, this is a school project and my teacher is the most unhelpful person ever. I don't know what I'm doing. Sorry if my code makes you cringe.
//Java Program to create a canvas and paint the canvas
import java.awt.*;
import javax.swing.*;
//apparently this lets me use the mouse to draw
import java.awt.event.*;
import java.awt.event.MouseListener;
import java.awt.event.MouseMotionListener;
//didn't need BreezySwing
//to save canvas
import java.io.File;
import java.awt.image.BufferedImage;
import javax.imageio.ImageIO;
import java.awt.Graphics;
import java.awt.Graphics2D;
//use JFrame instead of GBFrame, GBFrame won't let me use a canvas
class paint3 extends JFrame implements MouseListener, MouseMotionListener{
// create menubar and canvas
JMenuBar menuBar = new JMenuBar();
Canvas c;
// create color variable, set it to black
Color color = Color.black;
// create size variable, set it to 5
int size = 5;
////CONSTRUCTOR FOR FRAME////
public paint3()
{
////MENU STUFF////
setJMenuBar(menuBar); // Add the menu bar to the window
// create menus/menuitems
JMenu colorMenu = new JMenu("Color"); //create color menu
//implement methods to change the color of the brush when corresponding menu item is selected
JMenuItem black = new JMenuItem(new AbstractAction("Black") {
public void actionPerformed(ActionEvent e) {
color = Color.black;
}
});
JMenuItem darkGray = new JMenuItem(new AbstractAction("Dark Gray") {
public void actionPerformed(ActionEvent e) {
color = Color.darkGray;
}
});
JMenuItem gray = new JMenuItem(new AbstractAction("Gray") {
public void actionPerformed(ActionEvent e) {
color = Color.gray;
}
});
JMenuItem lightGray = new JMenuItem(new AbstractAction("Light Gray") {
public void actionPerformed(ActionEvent e) {
color = Color.lightGray;
}
});
JMenuItem red = new JMenuItem(new AbstractAction("Red") {
public void actionPerformed(ActionEvent e) {
color = Color.red;
}
});
JMenuItem orange = new JMenuItem(new AbstractAction("Orange") {
public void actionPerformed(ActionEvent e) {
color = Color.orange;
}
});
JMenuItem yellow = new JMenuItem(new AbstractAction("Yellow") {
public void actionPerformed(ActionEvent e) {
color = Color.yellow;
}
});
JMenuItem green = new JMenuItem(new AbstractAction("Green") {
public void actionPerformed(ActionEvent e) {
color = Color.green;
}
});
JMenuItem cyan = new JMenuItem(new AbstractAction("Cyan") {
public void actionPerformed(ActionEvent e) {
color = Color.cyan;
}
});
JMenuItem blue = new JMenuItem(new AbstractAction("Blue") {
public void actionPerformed(ActionEvent e) {
color = Color.blue;
}
});
JMenuItem magenta = new JMenuItem(new AbstractAction("Magenta") {
public void actionPerformed(ActionEvent e) {
color = Color.magenta;
}
});
JMenuItem pink = new JMenuItem(new AbstractAction("Pink") {
public void actionPerformed(ActionEvent e) {
color = Color.pink;
}
});
JMenuItem white = new JMenuItem(new AbstractAction("White") {
public void actionPerformed(ActionEvent e) {
color = Color.white;
}
});
JMenu sizeMenu = new JMenu("Size"); // Create Size menu
//implement methods to change the size of the brush when corresponding menu item is selected
JMenuItem five = new JMenuItem(new AbstractAction("5") {
public void actionPerformed(ActionEvent e) {
size = 5;
}
});
JMenuItem ten = new JMenuItem(new AbstractAction("10") {
public void actionPerformed(ActionEvent e) {
size = 10;
}
});
JMenuItem fifteen = new JMenuItem(new AbstractAction("15") {
public void actionPerformed(ActionEvent e) {
size = 15;
}
});
JMenuItem twenty = new JMenuItem(new AbstractAction("20") {
public void actionPerformed(ActionEvent e) {
size = 20;
}
});
JMenuItem twentyfive = new JMenuItem(new AbstractAction("25") {
public void actionPerformed(ActionEvent e) {
size = 25;
}
});
JMenuItem thirty = new JMenuItem(new AbstractAction("30") {
public void actionPerformed(ActionEvent e) {
size = 30;
}
});
//JMenu clearButton = new JMenu(new AbstractAction("Clear") {
//public void actionPerformed(ActionEvent e) {
//c.clearRect(0,0,800,600);
//}
//});
JMenu fileMenu = new JMenu("File"); //create file menu
JMenuItem save = new JMenuItem(new AbstractAction("Save") {
public void actionPerformed(ActionEvent e) {
saveCanvas(c);
}
});
// add menus/menuitems to frame
menuBar.add(colorMenu); // Add the color menu
colorMenu.add(black); //add color menu items to frame
colorMenu.add(darkGray);
colorMenu.add(gray);
colorMenu.add(lightGray);
colorMenu.add(red);
colorMenu.add(orange);
colorMenu.add(yellow);
colorMenu.add(green);
colorMenu.add(cyan);
colorMenu.add(blue);
colorMenu.add(magenta);
colorMenu.add(pink);
colorMenu.add(white);
menuBar.add(sizeMenu); // Add the size menu
sizeMenu.add(five); // Add size menu items to frame
sizeMenu.add(ten);
sizeMenu.add(fifteen);
sizeMenu.add(twenty);
sizeMenu.add(twentyfive);
sizeMenu.add(thirty);
menuBar.add(fileMenu); // Add the file menu
fileMenu.add(save); //Add file menu items to frame
//terminates program when window is closed
setDefaultCloseOperation(EXIT_ON_CLOSE);
////////
//create an empty canvas
c = new Canvas() {
//paint the canvas
public void paint(Graphics g)
{
}
};
//set background color of canvas
c.setBackground(Color.white);
//add mouse listener to canvas
c.addMouseListener(this);
c.addMouseMotionListener(this);
//add canvas to frame
add(c);
setSize(800,600);
setResizable(false);
show();
}
////////////
//mouse listener and mouse motion listener methods
public void mouseClicked(MouseEvent e)
{
Graphics g = c.getGraphics();
g.setColor(color);
//get x and y pos
int x, y;
x = e.getX();
y = e.getY();
//draw an oval at the point were mouse is moved
g.fillOval(x, y, size, size);
}
public void mouseMoved(MouseEvent e)
{
}
public void mouseDragged(MouseEvent e)
{
Graphics g = c.getGraphics();
g.setColor(color);
//get x and y pos
int x, y;
x = e.getX();
y = e.getY();
//draw an oval at the point were mouse is moved
g.fillOval(x, y, size, size);
}
public void mouseExited(MouseEvent e)
{
}
public void mouseEntered(MouseEvent e)
{
}
public void mouseReleased(MouseEvent e)
{
}
public void mousePressed(MouseEvent e)
{
}
//method to save canvas, but it just saves a black screen
public static void saveCanvas(Canvas c) {
BufferedImage image = new BufferedImage(c.getWidth(), c.getHeight(),BufferedImage.TYPE_INT_RGB);
Graphics2D graphics = image.createGraphics();
c.paint(graphics);
//save file
File file = new File("drawing.png");
try {
ImageIO.write(image, "png", file);
} catch (Exception e) {
}
}
//Main method
public static void main(String args[])
{
Frame frm = new paint3();
//need to capitalize canvas
Canvas c = new Canvas();
frm.setSize(800,600);
//frm.pack();
frm.setVisible(true);
}
}
