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Dynamically Draw A Logarithmic Spiral

/ Published in: ActionScript 3
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Need to adjust this code to be encapsulated. Linestyle is not being called correctly.

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  1. //
  2. //
  3. // centerX-- X origin of the spiral.
  4. // centerY-- Y origin of the spiral.
  5. // radius--- Distance from origin to outer arm.
  6. // sides---- Number of points or sides along the spiral's arm.
  7. // coils---- Number of coils or full rotations. (Positive numbers spin clockwise, negative numbers spin counter-clockwise)
  8. // rotation- Overall rotation of the spiral. ('0'=no rotation, '1'=360 degrees, '180/360'=180 degrees)
  9. //
  10. function logSpiral(centerX, centerY, radius, sides, coils, rotation){
  11. 	//
  12. 	with(this){// Draw within the clip calling the function.
  13. 		//
  14. 		// Start at the center.
  15. 		moveTo(centerX, centerY);
  16. 		//
  17. 		// How far to rotate around center for each side.
  18. 		var aroundStep = coils/sides;// 0 to 1 based.
  19. 		//
  20. 		// Convert aroundStep to radians.
  21. 		var aroundRadians = aroundStep * 2 * Math.PI;
  22. 		//
  23. 		// Convert rotation to radians.
  24. 		rotation *= 2 * Math.PI;
  25. 		//
  26. 		// For every side, step around and away from center.
  27. 		for(var i=1; i<=sides; i++){
  28. 			//
  29. 			// How far away from center
  30. 			var away = Math.pow(radius, i/sides);
  31. 			//
  32. 			// How far around the center.
  33. 			var around = i * aroundRadians + rotation;
  34. 			//
  35. 			// Convert 'around' and 'away' to X and Y.
  36. 			var x = centerX + Math.cos(around) * away;
  37. 			var y = centerY + Math.sin(around) * away;
  38. 			//
  39. 			// Now that you know it, do it.
  40. 			lineTo(x, y);
  41. 		}
  42. 	}
  43. }
  44. //
  45. //
  46. lineStyle(2, 0x000000);// Black.
  47. //       (centerX, centerY, radius, sides, coils, rotation)
  48. logSpiral(    250,     200,    320,   700,    14,        0);
  49. lineStyle(2, 0xD0D0D0);// Gray.
  50. logSpiral(    250,     200,    320,   700,    14,       .5);
  51. //
  52. //

URL: http://www.pixelwit.com/blog

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