Why doesn't my code produce a polygon when the coordinates are correctly generated?

Question

Currently, I've created a code that would generate the coordinates of a quadrilateral and inserted them into a list to generate the corners of the quad to make a polygon

I've currently generated the following code and the system.out.prints lets me know what coordinates were generated I've plotted them on a graph and I was satisfied with the plot that it generated

HOwever this is the code:

   package endOfYearGame;

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

public class arrow {
    double theta;
    int x;
    int y;
    int horizontal = 70;
    int vertical = 10;
    int originalX = 50;
    int originalY = 800-50;
    public arrow() {
        this.theta = Math.PI/4.0;
        this.x = originalX;
        this.y = originalY;
    }

    public void rotateRight() {
        this.theta = this.theta - 0.1;
    }
    public void rotateLeft() {
        this.theta = this.theta + 0.1;
    }

    public void drawArrow(Graphics2D win) {
        win.setColor(Color.BLACK);
        //x's of the rectangular arrows
        int bottomRightX = (int)(this.x+horizontal*Math.cos(theta));
        int topRightX = (int)(bottomRightX-Math.sin(this.theta)*vertical);
        int topLeftX = (int)(this.x-Math.sin(this.theta)*vertical);

        //y's of the rectangular arrows
        int bottomRightY = (int)(this.y-Math.sin(this.theta)*horizontal);
        int topRightY =  (int)(bottomRightY-vertical*Math.cos(this.theta)) ;
        int topLeftY = (int)(this.y-vertical/Math.cos(this.theta));
        int Xs[] = {this.x, bottomRightX, topRightX, topLeftX};
        int Ys[] = {this.y, bottomRightY, topRightY, topLeftY};
        int Xss[] = {this.x, bottomRightX, topRightX, topLeftX,this.x};
        int Yss[] = {this.y, bottomRightY, topRightY, topLeftY,this.y};
        win.setColor(Color.RED);
        win.drawPolygon(Xs,Ys,4);
        win.fillPolygon(Xss, Yss, 4);
        System.out.println("0000 bottomrightx = "+bottomRightX);
        System.out.println("toprightx= "+topRightX);
        System.out.println("topleftx= " + topLeftX);
        System.out.println("bottomleftx = "+this.x);
        System.out.println("bottomrighty = "+ bottomRightY );
        System.out.println("toprighty = "+topRightY);
        System.out.println("toplefty = "+topLeftY);
        System.out.println("bottomlefty = "+this.y);
    }

}

But it generates no polygon at all!

I was wondering if there was something wrong with this?

Answer 1

Your code never invokes drawArrow. If it did, it would draw the polygon. Here's the output:

0000 bottomrightx = 99
toprightx= 91
topleftx= 42
bottomleftx = 50
bottomrighty = 700
toprighty = 692
toplefty = 735
bottomlefty = 750

And here's the result in a 1024x768 window: