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POJava - making Triangle class
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copied!<p>I need to make a Class named "TriangleShape" which impliments java.awt.Shape. Now another Class "TriangleComponent" should have an object of TriangleShape class and it should draw a triangle, with the given length of sides.</p> <p>I managed to create it, but i've read that the triangle should be drawn in the following way:</p> <pre><code>TriangleShape t = new TriangleShape(30,40,50); g2.draw(t); //This is the Graphics2D object that I use in paintComponent </code></pre> <p>The following is the code that I created, but it uses Line2D to create a triangle. It is the TriangleShape class, assume that I have implimented all the methods of the Shape Class.</p> <pre><code>public class TriangleShape implements java.awt.Shape{ private double a, b, c; private int x,y; private Point2D loc; public TriangleShape() { this.a=0; this.b=0; this.c=0; } public TriangleShape(double a, double b, double c) { //if supplied dimensions form a valid Triangle if ( this.isValid(a,b,c) ) { this.a = a; this.b = b; this.c = c; } //Otherwise make it zero sized triangle else{ this.a=0; this.b=0; this.c=0; } } public void resize(double a, double b, double c) { if ( this.isValid(a,b,c) ) { this.a = a; this.b = b; this.c = c; } //else let size remain unchanged } public TriangleShape getRandomTriangle() { TriangleShape t = new TriangleShape(5,8,9); return t; } public double area(){ double area, s; s = (a+b+c)/2; area = Math.sqrt(s *(s-a) * (s-b) * (s-c)); return area; } private boolean isValid(double a, double b, double c) { double s = (a+b+c)/2; if ( ((s-a) * (s-b) * (s-c)) <= 0 ) return false; else return true; } public double perimeter() { double p; p = a+b+c; return p; } public double getA(){ return a; } public double getB(){ return b; } public double getC(){ return c; } public void setLocation(Point2D location){ loc = location; } public Point2D getLocation(){ return loc; } public double getX(){ return loc.getX(); } public double getY(){ return loc.getY(); } </code></pre> <p>And the TriangleComponent class:</p> <pre><code>public class TriangleComponent extends JComponent{ TriangleShape t; double alpha, beta, gamma; double a,b,c; double X,Y; @Override protected void paintComponent(Graphics g) { //super.paintComponent(g); Graphics2D g2 = (Graphics2D) g; t = new TriangleShape(100,100,190); t.setLocation(new Point2D.Double(100,500)); a = t.getA(); b = t.getB(); c = t.getC(); X = t.getX(); Y = t.getY(); ///////////////Drawing Base line..... g2.draw(new Line2D.Double(X,Y,(X+c),Y)); //line c... g2.draw(new Line2D.Double((X+c), Y, ((X+c)+a*Math.cos(Math.PI+getBeta())), (Y+a*Math.sin(Math.PI+getBeta())))); //line a... //JOIning the last end points g2.draw(new Line2D.Double(X, Y, ((X+c)+a*Math.cos(Math.PI+getBeta())), (Y+a*Math.sin(Math.PI+getBeta())))); System.out.println("X1 = "+X+" Y1 = "+Y); System.out.println("X2 = "+(X+c)+" Y2 = "+Y); System.out.println("X3 = "+((X+c)+a*Math.cos(Math.PI+getBeta()))+" Y3 = "+ (Y+a*Math.sin(Math.PI+getBeta()))); //System.out.println("Alpha = "+getAlpha()); System.out.println("Gamma = "+(getGamma()*180)/Math.PI); } public double getAlpha(){ double temp = Math.acos(((Math.pow(c, 2)+Math.pow(b, 2))-Math.pow(a, 2))/(2*b*c)); System.out.println("Alpha = "+temp+" Degrees"); return temp; } public double getBeta(){ double temp = Math.acos(((Math.pow(c, 2)+Math.pow(a, 2))-Math.pow(b, 2))/(2*a*c)); System.out.println("Beta = "+temp+" Degrees"); return (temp);// * Math.PI)/180; } public double getGamma(){ double temp = Math.acos(((Math.pow(a, 2)+Math.pow(b, 2))-Math.pow(c, 2))/(2*b*a)); System.out.println("Gamma = "+temp+" Degrees"); return (temp);// * Math.PI)/180; } } </code></pre> <p>This works, but I need a way to draw the triangle without relying on <code>Graphics2D</code> or drawing it directly with the <code>paintComponent</code> method. Is there a way to do this?</p>

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