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Elliptical Sprite Behavior
 

 

 

Behavior Curve Sprite - Move a sprite along a curved path.

Added on 7/30/2002

 

Compatibilities:
behavior D8 D8_5 D9 Mac PC Shockwave US

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Author: kenl (website)

Based on a Lissajous curve algorithm, this behavior is extremely versatile, and can produce an amazing variety of results. You can create curves of all sorts with the option to add loops so sprites can "swim" around all sorts of ways.

-- Moves a sprite on a definable Lissajous curve
-- Behavior by Ken Loge - kenl@ori.org
-- 06-01-02
-- Algorithm based on Lissajous Lab from Stormsky

property pWidthRange -- the width "spread" of the curve description
property pHeightRange -- the height "spread" of the curve description
property pOffsetValue -- if > 0 the curve appears to rotate on its X-axis
property pCurveLoops -- the number of "loops" the curve will make
property pIncrementAmount -- the "speed" the curve is drawn. A lower number produces a smoother curve, but is slower to draw.
property pHalfStageWidth -- use to store half of the stage width
property pHalfStageHeight -- use to store half of the stage height
property pCurveIncrementer -- use to add the increment amount for curve smoothness and draw speed

on getPropertyDescriptionList me
  list = [:]
  addProp list, #pWidthRange, [#comment: "Curve Width Area:", #format: #integer, #default: 100, #range: [#min: 0, #max: 500]]
  addProp list, #pHeightRange, [#comment: "Curve Height Area:", #format: #integer, #default: 100, #range: [#min: 0, #max: 500]]
  addProp list, #pOffsetValue, [#comment: "Curve X Offset Value:", #format: #float, #default: 0.0, #range: [#min: 0, #max: 10]]
  addProp list, #pCurveLoops, [#comment: "Number of Curve Loops:", #format: #integer, #default: 1, #range: [#min: 0, #max: 100]]
  addProp list, #pIncrementAmount, [#comment: "Curve Resolution:", #format: #float, #default: 0.02, #range: [#min: 0, #max: 5]]
  return list
end

on beginSprite me
  pHalfStageWidth = (the stageRight - the stageLeft) / 2
  pHalfStageHeight = (the stageBottom - the stageTop) / 2
end

on exitFrame me
  pCurveIncrementer = pCurveIncrementer + pIncrementAmount
  sprite(me.spriteNum).locH = (pWidthRange * sin((pCurveLoops * pCurveIncrementer) + pOffsetValue)) + pHalfStageWidth
  sprite(me.spriteNum).locV = (pHeightRange * sin(pCurveIncrementer)) + pHalfStageHeight
end

 


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