floor.java

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import java.awt.*;

// a static black-white floor model
public class floor implements model{
	private vector centre;
	private vector iDirection, jDirection, kDirection;
	private vector[][] vertix;
	private paste[] pastes;
	private vector[] polygonNormals;
	private paste[] boundary;
	private int NoOfPolygons;
	private vector[][] bound;
	private vector realCentre;

	public floor(vector centre){
		this.centre = centre;
		NoOfPolygons = 49;
		iDirection = new vector(1,0,0);
		jDirection = new vector(0,1,0);
		kDirection = new vector(0,0,1);
		vertix = new vector[NoOfPolygons][];
		pastes = new paste[NoOfPolygons];
		createVertix();
		makePaste();
	}

	public void update(vector change, double xzRotate, double yzRotate){

		// update the vertix accroding to the camera position and direction
		vector[][] tempVertix = new vector[NoOfPolygons][];
		for(int i = 0; i < tempVertix.length; i++){
			tempVertix[i] = new vector[vertix[i].length];
			for(int j = 0; j < tempVertix[i].length; j++){
				tempVertix[i][j] = vertix[i][j].add(change).rotate_XZ(xzRotate).rotate_YZ(yzRotate);
			}
		}
		for(int i = 0; i < 49; i++)
			pastes[i].update(tempVertix[i]);
	}

	private void createVertix(){
		// must add vertix in a clockwise manner

		int polygonIndex = 0;
		for(int i = 0; i < 7; i++){
			for(int j = 0; j < 7; j++){
				vertix[polygonIndex] = new vector[]{put(j*8, 0, 56 - i*8),
													put(j*8+8, 0, 56 - i*8),
													put(j*8+8, 0, 48 - i*8),
													put(j*8, 0, 48 - i*8)};
				polygonIndex++;
			}
		}
	}


	private vector put(double x, double y, double z){
		return centre.add(iDirection.scale(x)).add(jDirection.scale(y)).add(kDirection.scale(z));
	}

	private void makePaste(){
		for(int i = 0; i < 49; i++){
			if(i%2 == 0)
				pastes[i] = new paste(vertix[i], new Color(70,70,70),3);
			else
				pastes[i] = new paste(vertix[i], Color.white,3);
		}
	}


	public paste[] getBoundary(){
		return  boundary;
	}


	public vector getCentre(){
		return realCentre;
	}

	public paste[] getPolygon(){
		return pastes;
	}
}