How to paint a laser that shows the trajectory of the gun.

[z***@gmail.com]

I want to see a laser representation of the gun aiming.. Basically a line
that starts at the robot and ends at the point the gun is aiming at. Here
is my code:

public void onPaint(Graphics2D g){

int laserLength = 200;
double heading =getGunHeading();

g.setColor(Color.RED);
double x = Math.sin(Math.toRadians(heading)) * laserLength;
double y = Math.cos(Math.toRadians(heading)) *
laserLength;
g.drawLine((int)getX(),(int) getY(), (int)x,(int) y);

}

The laser starts at the robot but points to an irrelevant direction.

[Johannes Slotta]

Hi,

drawLine uses start and end points, perhaps you wanted something like

g.drawLine((int) getX(),(int) getY(), (int) (x+getX()),(int) (y+getY()));

HTH
Johannes

Post by z***@gmail.com
I want to see a laser representation of the gun aiming.. Basically a line
that starts at the robot and ends at the point the gun is aiming at. Here is
public void onPaint(Graphics2D g){
int laserLength = 200;
double heading =getGunHeading();
g.setColor(Color.RED);
double x = Math.sin(Math.toRadians(heading)) * laserLength;
double y = Math.cos(Math.toRadians(heading)) *
laserLength;
g.drawLine((int)getX(),(int) getY(), (int)x,(int) y);
}
The laser starts at the robot but points to an irrelevant direction.
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[z***@gmail.com]

Thanks that was the problem

Post by Johannes Slotta
Hi,
drawLine uses start and end points, perhaps you wanted something like
g.drawLine((int) getX(),(int) getY(), (int) (x+getX()),(int) (y+getY()));
HTH
Johannes

Post by z***@gmail.com
I want to see a laser representation of the gun aiming.. Basically a

line

Post by z***@gmail.com
that starts at the robot and ends at the point the gun is aiming at.

Here is

Post by z***@gmail.com
public void onPaint(Graphics2D g){
int laserLength = 200;
double heading =getGunHeading();
g.setColor(Color.RED);
double x = Math.sin(Math.toRadians(heading)) *

laserLength;

Post by z***@gmail.com
double y = Math.cos(Math.toRadians(heading)) *
laserLength;
g.drawLine((int)getX(),(int) getY(), (int)x,(int) y);
}
The laser starts at the robot but points to an irrelevant direction.
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