Question

I’m trying to draw a triangle at the position which the user clicks on.

This is what I’ve done so far:

int[] xPoints = {(xPosition / 2), xPosition, (xPosition + (xPosition / 2))};
int[] yPoints = {(yPosition + yPosition), yPosition, (yPosition + yPosition)};
g.drawPolygon(xPoints, yPoints, 3);

The problem is that the size of the triangle varies depending on the xPosition and yPosition (these are taken from mouse coordinates).

Any ideas how I can just place a fixed size triangle at the specified X and Y coordinates?

Answer 1

Instead of using xPosition / 2 and yPosition for the first and third points, use a fixed offset from the xPosition like so:

//use whatever size you want
//this will make a triangle with the top at the clicked point
int halfWidth = 50, height = 100; 
int[] xPoints = { xPosition - halfWidth, xPosition, xPosition + halfWidth };
int[] yPoints = { yPosition + height, yPosition, yPosition + height };

You can play around with the sizes, but if you want it to be equilateral, then height should be Math.sqrt(3) * halfWidth.