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Index › Programming Questions & Help › Programs › Change Angle of Drawn Line
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Change Angle of Drawn Line (Read 1362 times)
simsumdum
Change Angle of Drawn Line
Feb 21st, 2009, 8:03pm  
Hello,

I am interfacing an Arduino based IMU to Processing, I would like to draw a line in processing and have the line follow the angle at which the IMU is held.

I have the serial link working, Processing successfully inputs the angle from the Arduino.  The problem is how to apply the angle to the line.  I have tried using

rotate(radians(inputangle));
line(100,100,200,100);

first, this does not rotate the line on the axis (apperantly this can be fixed by the translate(); function?)

second as this goes through the main loop the line gets continuously rotated, ie.  if inputangle is 1 then it rotates (radians(1)) degree every loop.

I basically would like a line to mirror the IMU in angle.

Any thoughts??

Thanks!
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PhiLho 
Re: Change Angle of Drawn Line
Reply #1 - Feb 21st, 2009, 8:36pm  
Look at Re: getting the direction of a moving point, the DisplayAngle function. Indeed, you need to use a combination of translate and rotate, and restoring context (matrix) after.
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simsumdum
Re: Change Angle of Drawn Line
Reply #2 - Feb 22nd, 2009, 4:01am  
thanks, i got it to work for what i need now, even though I have absolutely no idea on why it work, but this will give me a base to experiment and learn on

thanks again
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