Using loop to draw line

Question

I'm supposed to draw this in Java

This is what I have so far:

DrawPanel.java

package drawpaneltest;

import java.awt.Graphics;
import javax.swing.JPanel;

public class DrawPanel extends JPanel {

    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        int width = getWidth();
        int height = getHeight();
        int d = 0;
        while (d < 301) {
            g.drawLine(0, d, width, height);
            d += 15;
        }
    }
}

DrawPanelTest.java

package drawpaneltest;

import javax.swing.JFrame;

public class DrawPanelTest {

    public static void main(String[] args) {
        DrawPanel panel = new DrawPanel();
        JFrame application = new JFrame();
        application.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        application.add(panel); // add the panel to the frame 
        application.setSize(250, 250); // set the size of the frame
        application.setVisible(true); // make the frame visible 
    }
}

The above code sample currently displays the following:

What did I missed out? How should I add the curved line and the vertical line?

Hint: The "curved" line is not a curved line, it's actually edged. — mezzodrinker
– mezzodrinker, Commented Oct 13, 2015 at 15:07
There are no curved lines at all on this picture, just straight lines. — Tassos Bassoukos
– Tassos Bassoukos, Commented Oct 13, 2015 at 15:17

Shofwan · Accepted Answer · 2015-10-13 15:51:41Z

1

Here's my approach:

package drawpaneltest;


import java.awt.Graphics;
 import javax.swing.JPanel;
 public class DrawPanel extends JPanel {
    public void paintComponent(Graphics g) {
        super.paintComponent(g);
        int width = getWidth();
        int height = getHeight();
        int x1 = 0, y1 = 0,
            x2 = 0, y2 = height;
        while (y1 < height) {
            g.drawLine(x1, y1, x2, y2);
            y1+=15;                 //You should modify this if
            x2+=15;                 //it's not an equal square (like 250x250)
        }
    }
 }

And then it will do this:

However in JPanel, coordinate (0,0) begin on the left top corner, not on left bottom corner as usual. And it still can not do well on a (m x n) squares, you have to do a lot more than this.

edited Oct 13, 2015 at 15:51

answered Oct 13, 2015 at 15:46

Shofwan

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Comments

Benoît · Accepted Answer · 2015-10-13 15:41:40Z

0

You should also change the to coordinates (d replacing width):

g.drawLine(0, d, d, height);

edited Oct 13, 2015 at 15:41

answered Oct 13, 2015 at 15:28

Benoît

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4 Comments

Flown Over a year ago

Your solution will generate parallel lines.

austin wernli Over a year ago

That wouldn't draw lines to the side of the screen.

Benoît Over a year ago

Oups, yes indeed. Thanks @Flown for noticing. Just corrected the line (hope I did not miss it this time).

Benoît Over a year ago

@austinwernli, after my edit 3 min ago, it does reproduce the expected result

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