Thread: Java applet drawing curved lines using nested for loop

Hello,

How can I draw the bottom left and right corner of this image? I'm able to draw them separately, but when putting them together the graphic is incorrect.
First program is the bottom left corner. Second for the bottom right.
https://imgur.com/a/1vtVM2A

import java.awt.*;
import java.applet.*;
 
 
public class Lab05v80 extends Applet
{
 
   public void init()
   {
      setSize(1000, 650); // width, height
   } 
 
	public void paint(Graphics g)
	{
		int width = 980;
		int height = 630;
		int x1 = 10;
		int y1 = 640;
		int x2 = 990;
		int y2 = 640;
		g.drawRect(10,10,width,height);
 
 
		for (int lines = 0; lines <= 50; lines++)     
                {              
                   g.drawLine(x1,y1,x2,y2);
                   y2 -= height/49;
                   x1 += width/49;
                 }
 
 
    }
 
}

import java.awt.*;
import java.applet.*;
 
 
public class Lab05v80 extends Applet
{
 
   public void init()
   {
      setSize(1000, 650); // width, height
   } 
 
	public void paint(Graphics g)
	{
		int width = 980;
		int height = 630;
		int x1 = 10;
		int y1 = 640;
		int x2 = 990;
		int y2 = 640;
		g.drawRect(10,10,width,height);
 
 
		for (int lines = 0; lines <= 50; lines++)     
                {              
                   g.drawLine(x1,y1,x2,y2);
                   y2 -= height/49;
                   x1 += width/49;
 
                 }
                    for (int line1 = 0; line1 <= 50; line1++)
                    {   g.drawLine(x2,y1,x1,y2);
                         y2 -= height/49;
                         x2 -= width/49;
                    }
    }
 
}

This is the bottom left corner

g.drawLine(x2,y1,x1,y2);
y2 -= height/49;
x2 -= width/49;

For the second for loop, is the indentation incorrect or the block structure?

How can I draw ...

You need to find the correct formulas and algorithm for doing the drawings. When you have them, then try writing the java code for it.

Isn't the control structure(nested for loop) sufficient to draw the curved lines?

I don't know what is needed to draw the lines without the design/algorithm for how the code show work.
There will probably be some loops but without a design I can not say what they would be.

Here is the algorithm for the posted code:

select two end points (1 & 2) for a line
start loop -  several times
   draw a line between the end points
   move end point 1 to the right
   move end point 2 up
end loop