Another Applet
CMPC :: Computing :: Programming :: Java
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Another Applet
by Paul Mon Dec 07, 2009 7:43 am
This applet creates a line that looks like the horizon or the silhouette of mountains or valleys.
- Code:
import java.applet.*;
import java.awt.*;
import java.util.ArrayList;
public class Terrain1 extends Applet
{
private int width, height;
private Point t1,t2;
public void init()
{
width = getSize().width;
height = getSize().height;
t1 = new Point(0, height/2);
t2 = new Point(width, height/2);
setBackground( Color.white );
}
public void paint( Graphics g )
{
g.setColor( Color.black );
ArrayList<LineSeg> list = new ArrayList<LineSeg>();
list.add(new LineSeg(t1,t2));
list.get(0).disp(g);
terRec(g,list,height/3, 5);
}
public void terRec(Graphics g, ArrayList<LineSeg> list, int Hrange, int n)
{
if( n == 0 ) return;
ArrayList<LineSeg> out = new ArrayList<LineSeg>();
for(int i = 0; i < list.size(); i++)
{
LineSeg temp1 = new LineSeg( list.get(i).start, list.get(i).middle() );
LineSeg temp2 = new LineSeg( temp1.end, list.get(i).end );
temp1.end.y += mrand(Hrange);
temp2.start.y = temp1.end.y;
out.add(temp1);
out.add(temp2);
}
g.clearRect(0,0,width,height);
for(int i =0;i < out.size(); i++)
{
out.get(i).disp(g);
mDelay(500);
}
mDelay(10);
terRec(g, out,Hrange/2, n-1);
}
public int mrand(int psN)
{
if(Math.round(Math.random())==0)return (int)( Math.round(Math.random()*psN) );
else return (int)( -Math.round(Math.random()*psN) );
}
public void mDelay(long millis)
{
long end = System.currentTimeMillis();
while(System.currentTimeMillis() <= end){}
return;
}
}
Paul- Pickaxe
- Posts : 611
Re: Another Applet
by Paul Mon Dec 07, 2009 7:44 am
It uses this class:
- Code:
import java.awt.*;
public class LineSeg
{
public Point start, end;
public LineSeg()
{
start = new Point(0,0);
end = new Point(1,1);
}
public LineSeg(Point begin, Point finish)
{
start = begin;
end = finish;
}
public Point middle()
{
return start.midpoint(end);
}
public double length()
{
return start.distance(end);
}
public void disp( Graphics g )
{
g.drawLine(start.x,start.y,end.x,end.y);
}
}
Paul- Pickaxe
- Posts : 611
Re: Another Applet
by Paul Mon Dec 07, 2009 7:45 am
Both of which use this class:
- Code:
public class Point
{
public int x,y;
public Point()
{
x = 0;
y = 0;
}
public Point( int xc, int yc )
{
x = xc;
y = yc;
}
public Point midpoint(Point between)
{
return new Point( (this.x+between.x)/2, (this.y+between.y)/2 );
}
public double distance(Point to)
{
return Math.sqrt( Math.pow(this.x-to.x,2)+Math.pow(this.y-to.y,2) );
}
}
Paul- Pickaxe
- Posts : 611
CMPC :: Computing :: Programming :: Java
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