zext.plantuml.com.ctreber.acearth.scandot.DotGeneratorStars Maven / Gradle / Ivy
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package zext.plantuml.com.ctreber.acearth.scandot;
import java.util.Random;
/**
* Generate random stars as dots.
*
*
© 2002 Christian Treber, [email protected]
* @author Christian Treber, [email protected]
*
*/
public class DotGeneratorStars extends ScanDotGenerator
{
// ::remove folder when __HAXE__
private final int fImageWidth;
private final int fImageHeight;
private int fBigStars;
private double fStarFrequency;
private final Random lRandom;
public DotGeneratorStars(int pWidth, int pHeight,
double pStarFrequency, int pBigStars, Random rnd)
{
lRandom = rnd;
fImageWidth = pWidth;
fImageHeight = pHeight;
fStarFrequency = pStarFrequency;
fBigStars = pBigStars;
}
public void generateScanDots()
{
// Make sure stars don't jump around between updates.
// final Random lRandom = new Random(ACearth.getStartTime());
final int lStarsMax = (int)(fImageWidth * fImageHeight * fStarFrequency);
for(int i = 0; i < lStarsMax; i++)
{
// "-1" to leave space for big stars.
int x = (int)(lRandom.nextDouble() * (fImageWidth - 1));
int y = (int)(lRandom.nextDouble() * fImageHeight);
fDots.add(new ScanDot(ScanDot.DotTypeStar, x, y));
// A big star is just two pixels wide.
if((fBigStars != 0) && (Math.random() * 100 < fBigStars))
{
fDots.add(new ScanDot(ScanDot.DotTypeStar, x + 1, y));
}
}
}
}