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Ease fish movement animations #103

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Merged
merged 1 commit into from
Oct 25, 2019
Merged

Ease fish movement animations #103

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8 changes: 7 additions & 1 deletion src/demo/renderer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -162,11 +162,17 @@ const finishMovement = () => {

// Calculate the screen's current X offset.
const getOffsetForTime = (t, totalFish) => {
// Normalize the fish movement amount from 0 to 1.
let amount = t / moveTime;

// Apply an S-curve to that amount.
amount = amount - Math.sin(amount*2*Math.PI) / (2*Math.PI);

return (
constants.fishCanvasWidth * totalFish -
constants.canvasWidth / 2 +
constants.fishCanvasWidth / 2 -
Math.round((t * constants.fishCanvasWidth) / moveTime)
Math.round(amount * constants.fishCanvasWidth)
);
};

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