Rescaling Image in Windows Form-CodePudding

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I can't see where I am going wrong here. What do I need to do in order to have my 14 points spread out over the canvass?

CodePudding user response：

let's take [[20, 20], [50, 50], [80, 80]] as an easy exemple.

min and max will be 20 and 80 and wanted scale is 0 to 2000.

for the point [50, 50]

(((oldValue - oldMin) * (newMax - newMin) / (oldMax - oldMin)) newMin)

gives

((50 - 20) * (2000 - 0) / (80 - 20)) 0 = 30*2000 / 60 = 1000 (which is half the size of the canvas)

seems coherent so the problem is not coming from the transform function

I suggest trying to debug it by printing the [X, Y] values of the "point" to be sure tho

Also print the min max of the oldScale to be sure this is not the problem

CodePudding user response：

Your issue is that you are returning a single min value and a single max value. You need separate min and max values for X and Y, as the ranges in each coordinate are different. In your sample data from the question the range of X is [-61.92, 61.86] and the range of Y is [80.83, 83]. Your approach will draw a frame covering [-61.92, -61.92] to [83, 83], with most of the points in one corner.