Curve Sprite - Move a sprite along a curved path.

 

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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