Drawing Circles

[iago]

Incidentally, I don't know if it's common knowledge or not, but if you do this:

Code Select Expand

i = 0;
do
  i++
  plot_pixel(sin(i), cos(i));
loop

It draws a circle.  Although it works better if you increment i by very small values, it's all good.  I learned that a long long time ago when I was playing with QBasic graphics.  By plotting SIN and COS against each other I used to draw spirals and waves and circles and stuff. 

[Joe]

Incidentally, I don't know if it's common knowledge or not, but if you do this:

Code Select Expand

i = 0;
do
  i++
  plot_pixel(sin(i), cos(i));
loop

It draws a circle.  Although it works better if you increment i by very small values, it's all good.  I learned that a long long time ago when I was playing with QBasic graphics.  By plotting SIN and COS against each other I used to draw spirals and waves and circles and stuff. 

Code Select Expand

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

/**
This class demonstrates drawing a circle by using the point {sin(i), cos(i)}
@author William LaFrance
@date 22 April 2006
*/
public class DrawCircle extends JFrame
{
/**
Program entry-point<br />
Calls class constructor
@param args Command-line arguments, split by spaces
*/
public static void main(String args[])
{
new DrawCircle();
}

/**
Class constructor<br />
Creates JFrame object and initalizes it
*/
private DrawCircle()
{
super("Circle Thing!");

this.setSize(1000, 1000);

this.getContentPane().setBackground(Color.black);

this.setDefaultCloseOperation(EXIT_ON_CLOSE);

this.setVisible(true);
}

/**
Draws the circle on the JFrame
@param g Graphics object to use for drawing on the JFrame
*/
    public void paint(Graphics g)
{

g.setColor(Color.yellow);
for (double i = 1; i < 100; i+=0.05)
{
g.fillRect((int)(Math.sin(i)*450)+500, (int)(Math.cos(i)*450)+500, 2, 2);
}
}
}

Cool!

[Chavo]

Incidentally, I don't know if it's common knowledge or not, but if you do this:

Code Select Expand

i = 0;
do
  i++
  plot_pixel(sin(i), cos(i));
loop

It draws a circle.  Although it works better if you increment i by very small values, it's all good.  I learned that a long long time ago when I was playing with QBasic graphics.  By plotting SIN and COS against each other I used to draw spirals and waves and circles and stuff. 

Welcome to being bored in high school with your first TI graphing calculator :-P

[MyndFyre]

Hahaha:

Code Select Expand


public void DrawCircle(Color outlineColor, Point center, int radius, Image target)
{
    using (Graphics g = Graphics.FromImage(target))
    {
        g.DrawEllipse(new Pen(new SolidBrush(outlineColor)),
            center.X - radius,
            center.Y - radius,
            center.X + radius,
            center.Y + radius);
    }
}


<3 library methods.  ;)

[deadly7]

If you want to draw a circle, why not do x^2+y^2=r^2?

[Quik]

Incidentally, I don't know if it's common knowledge or not, but if you do this:

Code Select Expand

i = 0;
do
  i++
  plot_pixel(sin(i), cos(i));
loop

It draws a circle.  Although it works better if you increment i by very small values, it's all good.  I learned that a long long time ago when I was playing with QBasic graphics.  By plotting SIN and COS against each other I used to draw spirals and waves and circles and stuff. 

Welcome to being bored in high school with your first TI graphing calculator :-P

Amen, brothah.