lamp.java

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import java.awt.*;

// a static lamp model

public class lamp 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 lamp(vector centre){
		this.centre = centre;
		realCentre = centre;
		NoOfPolygons = 37;
		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];
		bound = new vector[6][4];
		boundary  = new paste[6];
		vertix = new vector[NoOfPolygons][];
		pastes = new paste[NoOfPolygons];
		createVertix();
		makePaste();
		createBoundary();
	}

	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 < NoOfPolygons; i++)
			pastes[i].update(tempVertix[i]);
		//update boundary
		vector[][] tempBound = new vector[6][4];
		for(int i = 0; i < 6; i++){
			for(int j = 0; j < 4; j++){
				tempBound[i][j] = bound[i][j].add(change).rotate_XZ(xzRotate).rotate_YZ(yzRotate);
			}
		}
		for(int i = 0; i < 6; i ++)
			boundary[i].update(tempBound[i]);

		//update realcentre;
		realCentre = put(-1.9,3,-1.9).add(change).rotate_XZ(xzRotate).rotate_YZ(yzRotate);
	}


	private void createVertix(){
		// must add vertix in a clockwise manner
		int polygonIndex = 0;

		//construct the buttom of the lamp
		double r = 1.9;
		double theta = Math.PI/8;
		for(int i = 0; i < 16; i++){
			vertix[polygonIndex] = new vector[]{put(r*Math.cos(i*theta), 0.5, r*Math.sin(i*theta)),
											 put(r*Math.cos((i+1)*theta), 0.5,r*Math.sin((i+1)*theta)),
											 put(1.1*r*Math.cos((i+1)*theta), 0.05, 1.1*r*Math.sin((i+1)*theta)),
											 put(1.1*r*Math.cos(i*theta), 0.05, 1.1*r*Math.sin(i*theta))};
			polygonIndex++;
		}
		vertix[polygonIndex] = new vector[16];
		for(int i = 0; i < 16; i++)
			vertix[polygonIndex][15 - i] = put(r*Math.cos(i*theta), 0.5, r*Math.sin(i*theta));
		polygonIndex++;

		//construct the middle part of the lamp
		r = 0.25;
		theta = Math.PI/3;
		for(int i = 0; i < 6; i++){
			vertix[polygonIndex] = new vector[]{put(r*Math.cos(i*theta), 5, r*Math.sin(i*theta)),
											 put(r*Math.cos((i+1)*theta), 5,r*Math.sin((i+1)*theta)),
											 put(r*Math.cos((i+1)*theta), 0.55, r*Math.sin((i+1)*theta)),
											 put(r*Math.cos(i*theta), 0.55, r*Math.sin(i*theta))};
					polygonIndex++;
		}

		//construct the top of the lamp
		r = 1.7;
		for(int i = 0; i < 6; i++){
			vertix[polygonIndex] = new vector[]{put(r*Math.cos(i*theta), 6, r*Math.sin(i*theta)),
											 put(r*Math.cos((i+1)*theta), 6,r*Math.sin((i+1)*theta)),
											 put(1.3*r*Math.cos((i+1)*theta), 4, 1.3*r*Math.sin((i+1)*theta)),
											 put(1.3*r*Math.cos(i*theta), 4, 1.3*r*Math.sin(i*theta))};
					polygonIndex++;
		}
		for(int i = 0; i < 6; i++){
			vertix[polygonIndex] = new vector[]{
											 put(1.3*r*Math.cos(i*theta), 4, 1.3*r*Math.sin(i*theta)),
											 put(1.3*r*Math.cos((i+1)*theta), 4, 1.3*r*Math.sin((i+1)*theta)),
											 put(r*Math.cos((i+1)*theta), 6,r*Math.sin((i+1)*theta)),
											 put(r*Math.cos(i*theta), 6, r*Math.sin(i*theta))
											};
					polygonIndex++;
		}
		vertix[polygonIndex] = new vector[6];
		for(int i = 0; i < 6; i++)
			vertix[polygonIndex][5 - i] = put(r*Math.cos(i*theta), 6, r*Math.sin(i*theta));
		polygonIndex++;
		vertix[polygonIndex] = new vector[6];
		for(int i = 0; i < 6; i++)
			vertix[polygonIndex][i] = put(r*Math.cos(i*theta), 6, r*Math.sin(i*theta));
		polygonIndex++;


	}

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

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

	private void makePaste(){
		for(int i = 0; i < 16; i++)
			pastes[i] = new paste(vertix[i], new Color(137, 171, 252), 1);

		pastes[16] = new paste(vertix[16], new Color(137, 171, 252), 1);

		for(int i = 0; i < 6; i++)
			pastes[17+i] = new paste(vertix[17+i], new Color(137, 171, 252), 2);

		for(int i = 0; i < 6; i++)
			pastes[23+i] = new paste(vertix[23+i], new Color(227, 249, 81), 1);

		for(int i = 0; i < 6; i++)
			pastes[29+i] = new paste(vertix[29+i], new Color(255-i*2, 255 -i*2, 255 - i*2), 0);

		pastes[35] = new paste(vertix[35], new Color(227, 249, 81), 1);
		pastes[36] = new paste(vertix[35], new Color(220, 220, 220), 0);
	}

	public void createBoundary(){
		vector temp = centre;
		centre = put(-1.9,0,-1.9);
		bound[0] = new vector[]{put(0,0,0), put(0,0,3.8), put(0,6,3.8), put(0,6,0)};
		boundary[0] = new paste(bound[0], Color.green, 1);
		bound[1] = new vector[]{put(0,6,3.8), put(3.8,6,3.8), put(3.8,6,0), put(0,6,0)};
		boundary[1] = new paste(bound[1], Color.green, 1);
		bound[2] = new vector[]{put(0,0,0), put(0,6,0), put(3.8,6,0), put(3.8,0,0)};
		boundary[2] = new paste(bound[2], Color.green, 1);
		bound[3] = new vector[]{put(3.8,6,3.8), put(0,6,3.8), put(0,0,3.8), put(3.8,0,3.8)};
		boundary[3] = new paste(bound[3], Color.green, 1);
		bound[4] = new vector[]{put(0,0,0), put(3.8,0,0), put(3.8,0,3.8), put(0,0,3.8)};
		boundary[4] = new paste(bound[4], Color.green, 1);
		bound[5] = new vector[]{put(3.8,6,3.8), put(3.8,0,3.8), put(3.8,0,0), put(3.8,6,0)};
		boundary[5] = new paste(bound[5], Color.green, 1);
		centre = temp;
	}

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

	public vector getCentre(){
		return realCentre;
	}
}