# Thread: X & Y proportional scale

1. ## X & Y proportional scale

Hi everyone,

So I am trying to plot points in a rectangle. I am given an X and Y value that is 0,0 if its in the centre of the rectangle. if its Y position is -750 its at the top and 750 if its at the bottom.
I am trying to plot it onto a chart but a calculation is needed. On my chart the Y centre is also 0, but the top is position 0.967 and bottom is -0.967

So in essence

Y top = -750 and 0.967
y bottom = 750 and -0.967
y middle = 0 and 0

What would be the calculation for instance if I got given a y value of -400

Thanks

2. Originally Posted by StudentD
So I am trying to plot points in a rectangle. I am given an X and Y value that is 0,0 if its in the centre of the rectangle. if its Y position is -750 its at the top and 750 if its at the bottom.
I am trying to plot it onto a chart but a calculation is needed. On my chart the Y centre is also 0, but the top is position 0.967 and bottom is -0.967

So in essence

Y top = -750 and 0.967
y bottom = 750 and -0.967
y middle = 0 and 0

What would be the calculation for instance if I got given a y value of -400
I imagine this is a graphic programming problem, where the vertical axis is taken to be oriented downward.

As you say, the distance is proportional to the coordinate. So their ratio is d/y = 0.967/-750. Just solve the proportion to find d when y = -400 or whatever.