piece.java

java编的一个火焰程序

package skyrocket;

import java.awt.Color;
import java.awt.Graphics2D;

class Piece extends Thing {



Color traceColor;
double velocityX, velocityY;

Piece( Canvas canvas, Color traceColor, double originX, double originY, double velocity, double angle ) {
	super( canvas );
//System.out.println( "sn,1011;color,"+color.getRGB()+";x,"+originX+",y"+originY+";v,"+velocity+";a,"+angle+";" );
	color = Color.white;
	width = canvas.pieceWidth;
	height = canvas.pieceHeight;
	stateX = originX;
	stateY = originY;
	this.traceColor = traceColor;
	velocityX = velocity * Math.cos( angle );
	velocityY = velocity * Math.sin( angle );
}

void draw( Graphics2D g, int time ) {

	Trace trace = new Trace( this );
	trace.color = traceColor;
	canvas.things.add( trace );

	velocityX *= canvas.damp;

	velocityY += canvas.gravity;
	velocityY *= canvas.damp;

	stateY += velocityY;
	stateX += velocityX;

//System.out.println( "sn,1012;x,"+stateX+",y,"+stateY+";vx,"+velocityX+";vy,"+velocityY+";" );
	g.fillRect( (int)stateX, (int)stateY, width, height );

	color = new Color(
		(int) ( color.getRed() * canvas.pieceDarkerFactor ),
		(int) ( color.getGreen() * canvas.pieceDarkerFactor ),
		(int) ( color.getBlue() * canvas.pieceDarkerFactor )
	);
	if( color.getRed() + color.getGreen() + color.getBlue() < 10 )
		stateDead = true;

}




}