HowToMakeNiceAimingGraphics

Someone asked how I get the aiming graphics for ScruchiPu.

The first think you will need is RobocodeGLV014.

Then do as follows:

1. Import the following libraries.

import java.awt.geom.Point2D;
import java.awt.geom.Line2D;
import robocode.robocodeGL.system.GLRenderer;
import robocode.robocodeGL.PointGL;
import robocode.robocodeGL.LineGL;
import java.awt.Color;

2. Declare the following variables.

static int n,m; 
static Line2D[] ps = new Line2D[100000];

3. On your scan event add the following code (targetBearing is the absolute bearing to the target).

ps[n] = new Line2D.Double(getX(),getY(),getX()+eGetDistance*Math.sin(targetBearing),getY()+eGetDistance*Math.cos(targetBearing));

4. Before firing, call the method calculateGunBearings(); (see below)

5. When firing (probably in your scan event) add (note that predBearing is the relative bearing to target for firing):

PointGL pt4 = new PointGL(); pt4.setPosition(getTime(),50+50*predBearing); pt4.setSize(2); pt4.setColor(Color.green); GLRenderer.getInstance().addRenderElement(pt4);		


6. At the end of your scan event, add:

n++;

7. The method is as follows:

   public void calculateGunBearings() {
     for (int i=m+1; i<((int)n-1); i++) {	
	Line2D gun = new Line2D.Double(ps[i].getP1(),ps[i].getP2());
	int j = 0;
	while (j*11.0 < gun.getP1().distance(gun.getP2())-20.0 && i+j<n ) { 
	     j++; gun.setLine(gun.getP1(),ps[i+j].getP2());
	}
	if (i+j < n) {
	     double angle = bearings[m] = normalRelativeAngle(Math.atan2(gun.getX2()-gun.getX1(),gun.getY2()-gun.getY1()) - Math.atan2(ps[i].getX2()-gun.getX1(),ps[i].getY2()-gun.getY1()));
	     double tolerance = Math.asin(50/ps[i].getP1().distance(ps[i].getP2()));
	     PointGL pme = new PointGL(); pme.setPosition(getTime()-n+m,50+angle*50+tolerance*50); pme.setColor(Color.white); GLRenderer.getInstance().addRenderElement(pme);
	     PointGL pme2 = new PointGL(); pme2.setPosition(getTime()-n+m,50+angle*50-tolerance*50);	pme2.setColor(Color.white); GLRenderer.getInstance().addRenderElement(pme2);
	     m++;
	}
     }
   }

-- Albert