我需要创建一个名为“TriangleShape”的类来实现java.awt.Shape。

现在另一个类“TriangleComponent”应该有一个TriangleShape类的对象，它应该绘制一个三角形，并且具有给定的边长。

我设法创建它，但我读过三角形应该按照以下方式绘制：

TriangleShape t = new TriangleShape(30,40,50);

g2.draw(t); //This is the Graphics2D object that I use in paintComponent以下是我创建的代码，但它使用Line2D创建三角形。

它是TriangleShape类，假设我已经实现了Shape类的所有方法。

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();

}和TriangleComponent类：

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;

}

}这是有效的，但我需要一种绘制三角形的方式，而不依赖Graphics2D或直接使用paintComponent方法绘制它。有没有办法做到这一点？