ActionScript 3.0 :: Flash Finding Best Fit Slope Of A Bitmap Surface
Jan 24, 2012
I was wondering if anyone knows of a way to isolate the pixels that are adjacent to a certain color pixel in a BitmapData. For example, if there was a BitmapData that looked something like this:[code]I was wondering if there was a proven and efficient way of doing this, because I am trying to make a collision engine of sorts that can give me the collision normal of the best fit slope of a given bitmap image. In the scenario of the last example, the slope would be 1/1, or -45 degrees. The way I have it now, I am isolating the adjacent pixels by blurring the entire image, looping through all of the pixels, and storing the gray ones in an array. from there I can determine the best fit slope of the surface of the image. The only thing is that this seems like a lot of work for the CPU. Is there a better way to isolate the black pixels adjacent to white ones than blurring the image and looping through every pixel?
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I'm having trouble with this mainly because Flash's Math.atan() doesn't give the same results as my TI-83's tan^-1 function.
If I have a line with a positive rise and run for the slope and use tan^-1( (the slope) ) on my calculator, I get a value between 0 and 90, with 0 being a horizontal line and 90 a vertical line. A negative numerator with a negative denominator for the slope puts it in quadrant 4 where tan^-1(slope) gives 0 to -90 values, again with 0 being horizontal and -90 being vertical.
Putting the slope of the blue line into tan^-1() would give a value of about 80 degrees, while the red line would calculate to about -50 degrees. The rotation property Flash uses rotates objects clockwise and can range from 0-360. Using the -90 to 90 values and figuring out if the rise and run of the slope are positive or negative, I can determine which quadrant the line is in and calculate the degrees.
However, this so far is not possible for me because Math.atan() gives odd results.
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