Question

I have data like this

x-axis data values
-20.49, -12.23, -9.99, -1.00 0 , 1.12, 2.23, 3.45, 4.56, 8.99, 20.99, 30.23

y-axis data values
10,20,20,40,50,60……..

I would like to transform above given data into xy coordinate system.

Please have look at the image.

For eg:

along x-axis (min, max ) data value (-20.49, 30.23),

along y-axis (min, max ) data value (10,60)

now if I want plot data(-20.49, 10) in image,
the X coordinate is going to be =200,
and Y-coordinate going to be = 220.

Like this I want plot all data fits within the range of rectangle.

Hope this gives all details

Thanks

Answer 1

This is more of the math question, not related to any programming language. And speaking about Actionscript 3, it has Y axis going from top to bottom, not from bottom to top. Anyway: If you have two points on an axis that you want to map to screen coordinates of your choice, record xmin as lesser native value, xmax as greater native value, and coordinates as xleft and xright. Then, when you need to receive a screen coordinate for your given x, you calculate the xcoord value as:

xcoord = xleft + (x - xmin)*(xright - xleft)/(xmax - xmin);

Similar approach will net you correct values for the Y axis.