How to draw a circle with given X and Y coordinates as the middle spot of the circle

Question

I have developed a telecommunication application for locating signal strengths from the towers  I have used java swing and I m having a problem when drawing the circle around the given point of the mobile signal transmitter tower location  I have already calculated the X  Y coordinates and also the radius value    Please find the below code which I ve used to draw the circle and it is having issues   JPanel panelBgImg   new JPanel         public void paintComponent Graphics g            g drawOval X  Y  r  r             The issue is  it creates the circle but it didn t take the X and Y coordinates as the center point  It took the X and Y coordinates as the top left point of the circle    Could anyone please help me to draw the circle by having the given X and Y coordinates as the center point of the circle

User · Answer

So we are all doing the same home work   Strange how the most up-voted answer is wrong  Remember  draw fillOval take height and width as parameters  not the radius  So to correctly draw and center a circle with user-provided x  y  and radius values you would do something like this   public static void drawCircle Graphics g  int x  int y  int radius       int diameter   radius   2       shift x and y by the radius of the circle in order to correctly center it   g fillOval x - radius  y - radius  diameter  diameter

User · Answer

Replace your draw line with  g drawOval X - r  Y - r  r  r    This should make the top-left of your circle the right place to make the center be  X Y   at least as long as the point  X - r Y - r  has both components in range

User · Answer

The only thing that worked for me   g drawOval  getWidth  -200  2  getHeight  -200  2  200  200

User · Answer

This draws an arc with the center in the specified rectangle  You can draw  half-circles  quarter-circles  etc   g drawArc x - r  y - r  r   2  r   2  0  360

User · Answer

JPanel pnlCircle   new JPanel             public void paintComponent Graphics g                int X 100              int Y 100              int d 200              g drawOval X  Y  d  d                  you can change X Y coordinates and radius what you want

User · Answer

both answers are is incorrect  it should read   x- r  y- r    drawOval x y r 2 r 2

User · Answer

import java awt Color  import java awt Graphics2D  import java awt Graphics  import javax swing JFrame   public class Graphiic          public Graphics GClass      public Graphics2D G2D      public  void Draw Circle JFrame jf int radius   int  xLocation  int yLocation                GClass   jf getGraphics            GClass setPaintMode            GClass setColor Color MAGENTA           GClass fillArc xLocation  yLocation  radius  radius  0  360           GClass drawLine 100  100  200  200

User · Answer

drawCircle int X  int Y  int Radius  ColorFill  Graphics gObj

User · Answer

The fillOval fits an oval inside a rectangle  with width r  height   r you get a circle  If you want fillOval x y r r  to draw a circle with the center at  x y  you will have to displace the rectangle by half its width and half its height   public void drawCenteredCircle Graphics2D g  int x  int y  int r      x   x- r 2     y   y- r 2     g fillOval x y r r       This will draw a circle with center at x y

[java] How to draw a circle with given X and Y coordinates as the middle spot of the circle?

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