excaliburjs / Excalibur / 14804036802

coverage: 5.927% (-83.4%) from 89.28%
14804036802

Pull #3404

github

web-flow 
Merge 5c103d7f8 into 0f2ccaeb2
Pull Request #3404: feat: added Graph module to Math

234 of 8383 branches covered (2.79%)

229 of 246 new or added lines in 1 file covered. (93.09%)

13145 existing lines in 208 files now uncovered.

934 of 15759 relevant lines covered (5.93%)

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Source File
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0.0
/src/engine/Graphics/TransformInterpolation.ts
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import { Transform } from '../Math/transform';
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/**










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 * Blend 2 transforms for interpolation, will interpolate from the context of newTx's parent if it exists










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 */










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export function blendTransform(oldTx: Transform, newTx: Transform, blend: number, target?: Transform): Transform {











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  if (oldTx.parent !== newTx.parent) {





×







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    // Caller expects a local transform










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    // Adjust old tx to be local to the new parent whatever that is











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    const oldTxWithNewParent = oldTx.clone();




×








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    const oldGlobalPos = oldTx.globalPos.clone();




×








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    const oldGlobalScale = oldTx.globalScale.clone();




×








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    const oldGlobalRotation = oldTx.globalRotation;




×








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    oldTxWithNewParent.parent = newTx.parent;




×








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    oldTxWithNewParent.globalPos = oldGlobalPos;




×








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    oldTxWithNewParent.globalScale = oldGlobalScale;




×








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    oldTxWithNewParent.globalRotation = oldGlobalRotation;




×








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    oldTx = oldTxWithNewParent;




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  }











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  let interpolatedPos = newTx.pos;




×








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  let interpolatedScale = newTx.scale;




×








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  let interpolatedRotation = newTx.rotation;




×







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  interpolatedPos = newTx.pos.scale(blend).add(oldTx.pos.scale(1.0 - blend));




×








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  interpolatedScale = newTx.scale.scale(blend).add(oldTx.scale.scale(1.0 - blend));




×







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  // Rotational lerp https://stackoverflow.com/a/30129248











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  const cosine = (1.0 - blend) * Math.cos(oldTx.rotation) + blend * Math.cos(newTx.rotation);




×








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  const sine = (1.0 - blend) * Math.sin(oldTx.rotation) + blend * Math.sin(newTx.rotation);




×








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  interpolatedRotation = Math.atan2(sine, cosine);




×







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  const tx = target ?? new Transform();





×








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  tx.setTransform(interpolatedPos, interpolatedRotation, interpolatedScale);




×








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  return tx;




×







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}










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/**










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 *










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 */










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export function blendGlobalTransform(oldTx: Transform, newTx: Transform, blend: number, target?: Transform): Transform {










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  let interpolatedPos = newTx.globalPos;




×







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  let interpolatedScale = newTx.globalScale;




×







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  let interpolatedRotation = newTx.globalRotation;




×







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  interpolatedPos = newTx.globalPos.scale(blend).add(oldTx.globalPos.scale(1.0 - blend));




×







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  interpolatedScale = newTx.globalScale.scale(blend).add(oldTx.globalScale.scale(1.0 - blend));




×







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  // Rotational lerp https://stackoverflow.com/a/30129248










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  const cosine = (1.0 - blend) * Math.cos(oldTx.globalRotation) + blend * Math.cos(newTx.globalRotation);




×







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  const sine = (1.0 - blend) * Math.sin(oldTx.globalRotation) + blend * Math.sin(newTx.globalRotation);




×







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  interpolatedRotation = Math.atan2(sine, cosine);




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  const tx = target ?? new Transform();





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  tx.setTransform(interpolatedPos, interpolatedRotation, interpolatedScale);




×







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  return tx;




×







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}
























    

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