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Initializing a component in an application.

Posted on 1997-04-06
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Last Modified: 2010-04-16
I am trying to draw graphics in a frame.  I tried using:
Component drawInto = new Canvas();
Graphics g = drawInto.getGraphics();
g.drawline(X1,Y1,X2,Y2);
There is more code obviously, but since this is an application and not an applet, I don't know how to initialize the component.  The frame comes up, but I don't get a Canvas or a line. If I try paint(Graphics g), the program compiles correctly, but I get a nullpointer error when I try to execute the program.  Any answers?
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Question by:FRAYSER
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1 Comment
 
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majkl earned 100 total points
ID: 1219450
Well. The bast way to do graphics is to extend Canvas component :
class MyCanvas extends Canvas
{
//put code for drawing in here
 
}
declare there methods to draw .....
draw in function paint(Graphics g) or update

 public void update (Graphics g)
     {
        paint (g);
     }

to avoid flickering.

Put canvas in frame like this
MyCanvas canvas = new Mycanvas();
canvas.resize(x,y); //x,y wanted size
canvas.move(xx,yy); xx,yy wanted position
//call draw methods
canvas.draw_shape();


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