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Drawing Circle with End-Point of Line as Centre

User_AYF65
User_AYF65 Member Posts: 135 Red Ribbon
edited Apr 13, 2017 12:17PM in New To Java

Hi,

I am trying to draw a circle  with centre at the end point of Line but the centre is not exactly at the the end point.

import java.applet.Applet;

import java.awt.*;

import javax.swing.*;

import java.awt.image.*;

import javax.imageio.ImageIO;

public class JCircle extends Applet{

    int x1=30;int ix1;

    int y1=30;int iy1;

    int x2=60;int ix2;

    int y2=60;int iy2;

     public  void paint(Graphics g) {

              g.drawLine(x1, y1,x2, y2);

              g.drawOval( x1, y1, 10, 10);

              g.drawOval( x2, y2, 10, 10);

             

    }

}

can some body please guide me what is the problem?

Zulfi.

circles not at end points.jpg

eudriscabrera-JavaNet

Answers

  • Unknown
    edited Apr 12, 2017 10:37AM
     I am trying to draw a circle with centre at the end point of Line but the centre is not exactly at the the end point.. . .can some body please guide me what is the problem?

    The Java API for 'drawOval' will tell you the problem - have you read it?

    https://docs.oracle.com/javase/7/docs/api/java/awt/Graphics.html#drawOval(int,%20int,%20int,%20int)

    Draws the outline of an oval. The result is a circle or ellipse that fits within the rectangle specified by the x, y, width, and height arguments.  The oval covers an area that is width + 1 pixels wide and height + 1 pixels tall.

    You need to specify the coordinates of the 'bounding rectangle' and the circle will be drawn INSIDE it.

     int x1=30;int ix1; int y1=30;int iy1; int x2=60;int ix2; int y2=60;int iy2; public void paint(Graphics g) { g.drawLine(x1, y1,x2, y2); g.drawOval( x1, y1, 10, 10); g.drawOval( x2, y2, 10, 10);

    So the TOP LEFT CORNER of your first 'bounding rectangle' is at x1, y1 and the height and width are 10.

    You need to use x1 - 5 and y1 - 5.

    eudriscabrera-JavaNet
  • User_AYF65
    User_AYF65 Member Posts: 135 Red Ribbon
    edited Apr 12, 2017 11:47PM

    Thanks. This problem is solved now.

    God bless you.

    Zulfi.

  • Unknown
    edited Apr 13, 2017 12:17PM

    Then please mark the thread ANSWERED.

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