Spinning box
Author 
Message 
bryan_magnum

Posted: Fri May 28, 2004 8:28 pm Post subject: Spinning box 


How would i be able to make a box in turing and then make it spin in a circle, while spinning it gets bigger until it is the size of the screen? 





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AsianSensation

Posted: Fri May 28, 2004 8:56 pm Post subject: (No subject) 


I see 2 ways.
Either use Pic.Rotate and Pic.Scale to change and rotate the picture of a box everytime in a loop. (not recommended, because Pic.Scale is really slow, and Pic.Rotate is not accurate)
A better way is to keep track of 4 points. Then use whatever math is needed to move those 4 points into their position, and then use drawpolygon. 





bryan_magnum

Posted: Fri May 28, 2004 9:28 pm Post subject: (No subject) 


how would i be able to make the four points spin and move out/ get bigger at the same time? 





AsianSensation

Posted: Fri May 28, 2004 9:35 pm Post subject: (No subject) 


you can represent any coordinate on the Cartesian Plane in polar form.
so have a variable call r, and theta.
each point could then be represented by (rcos (theta), rsin (theta)), where r is the magnitude of the vector (ie, how far it's from the center) and theta is the angle.
so you can have a loop, and increase theta every time, as well as your r. Make sure to start in the center of the screen, and make that your origin. The four points just have a difference in theta of 90. 






