Line form corner to corner

Question

I got a little problem, I think I made a mistake. Can you help me please? Question: I want to use specifix integers for drawing line and filling rectangle. I tried to do it, but line, using same coordinates as rectangle, is not from corner to another corner.

void draw(Graphics g) {

    int x = getWidth();//1920
    int y = getHeight();//1080
    int x0 = 10; int y0 = 10;


    g.setColor(Color.RED);
    g.fillRect(x0, y0, x0 + 1300, y0 + 800);    


    g.setColor(Color.CYAN);
    g.drawLine(x0, y0, x0 + 1300, y0 + 800);


}

image how it looks:

Thank you!

Answer 1

I tried to do it, but line, using same coordinates as rectangle

But both method don't use coordinates:

g.fillRect(x0, y0, x0 + 1300, y0 + 800);    

The fillRect draws a rectangle from a starting point using a width and height.

g.drawLine(x0, y0, x0 + 1300, y0 + 800);

The drawLine draws a line between two points.

When drawing the rectangle the code should be:

//g.fillRect(x0, y0, x0 + 1300, y0 + 800);    
g.fillRect(x0, y0, 1300, 800);