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import React, { useEffect, useState } from 'react';
type Props = {
setFunc: (newPoints: { p1: number[]; p2: number[] }) => void;
currPoints: { p1: number[]; p2: number[] };
};
const ANIMATION_DURATION = 750;
const CONTAINER_WIDTH = 200;
const EDITOR_WIDTH = 100;
const OFFSET = (CONTAINER_WIDTH - EDITOR_WIDTH) / 2;
export const TIMING_DEFAULT_MAPPINGS = {
ease: 'cubic-bezier(0.25, 0.1, 0.25, 1.0)',
linear: 'cubic-bezier(0.0, 0.0, 1.0, 1.0)',
'ease-in': 'cubic-bezier(0.42, 0, 1.0, 1.0)',
'ease-out': 'cubic-bezier(0, 0, 0.58, 1.0)',
'ease-in-out': 'cubic-bezier(0.42, 0, 0.58, 1.0)',
};
export function EaseFuncToPoints(func: string) {
let strPoints = func || 'ease';
if (!strPoints.startsWith('cubic')) {
switch (func) {
case 'linear':
strPoints = 'cubic-bezier(0.0, 0.0, 1.0, 1.0)';
break;
case 'ease':
strPoints = 'cubic-bezier(0.25, 0.1, 0.25, 1.0)';
break;
case 'ease-in':
strPoints = 'cubic-bezier(0.42, 0, 1.0, 1.0)';
break;
case 'ease-out':
strPoints = 'cubic-bezier(0, 0, 0.58, 1.0)';
break;
case 'ease-in-out':
strPoints = 'cubic-bezier(0.42, 0, 0.58, 1.0)';
break;
default:
strPoints = 'cubic-bezier(0.25, 0.1, 0.25, 1.0)';
}
}
const components = strPoints
.split('(')[1]
.split(')')[0]
.split(',')
.map(elem => parseFloat(elem));
return {
p1: [components[0], components[1]],
p2: [components[2], components[3]],
};
}
/**
* Visual editor for a bezier curve with draggable control points.
* */
function CubicBezierEditor({ setFunc, currPoints }: Props) {
const [animating, setAnimating] = useState(false);
const [c1Down, setC1Down] = useState(false);
const [c2Down, setC2Down] = useState(false);
const roundToHundredth = (num: number) => Math.round(num * 100) / 100;
useEffect(() => {
if (animating) {
setTimeout(() => {
setAnimating(false);
}, ANIMATION_DURATION * 2);
}
}, [animating]);
useEffect(() => {
if (!c1Down) return undefined;
window.addEventListener('pointerup', () => {
setC1Down(false);
});
const handlePointerMove = (e: PointerEvent) => {
const newX = currPoints.p1[0] + e.movementX / EDITOR_WIDTH;
if (newX < 0 || newX > 1) {
return;
}
setFunc({
...currPoints,
p1: [roundToHundredth(currPoints.p1[0] + e.movementX / EDITOR_WIDTH), roundToHundredth(currPoints.p1[1] - e.movementY / EDITOR_WIDTH)],
});
};
window.addEventListener('pointermove', handlePointerMove);
return () => window.removeEventListener('pointermove', handlePointerMove);
}, [c1Down, currPoints]);
// Sets up pointer events for moving the control points
useEffect(() => {
if (!c2Down) return undefined;
window.addEventListener('pointerup', () => {
setC2Down(false);
});
const handlePointerMove = (e: PointerEvent) => {
const newX = currPoints.p2[0] + e.movementX / EDITOR_WIDTH;
if (newX < 0 || newX > 1) {
return;
}
setFunc({
...currPoints,
p2: [roundToHundredth(currPoints.p2[0] + e.movementX / EDITOR_WIDTH), roundToHundredth(currPoints.p2[1] - e.movementY / EDITOR_WIDTH)],
});
};
window.addEventListener('pointermove', handlePointerMove);
return () => window.removeEventListener('pointermove', handlePointerMove);
}, [c2Down, currPoints]);
return (
<svg className="presBox-bezier-editor" width={`${CONTAINER_WIDTH}`} height={`${CONTAINER_WIDTH}`} xmlns="http://www.w3.org/2000/svg">
{/* Outlines */}
<line x1={`${0 + OFFSET}`} y1={`${EDITOR_WIDTH + OFFSET}`} x2={`${EDITOR_WIDTH + OFFSET}`} y2={`${0 + OFFSET}`} stroke="#c1c1c1" strokeWidth="1" />
{/* Box Outline */}
<rect x={`${0 + OFFSET}`} y={`${0 + OFFSET}`} width={EDITOR_WIDTH} height={EDITOR_WIDTH} stroke="#c5c5c5" fill="transparent" strokeWidth="1" />
{/* Editor */}
<path
d={`M ${0 + OFFSET} ${EDITOR_WIDTH + OFFSET} C ${currPoints.p1[0] * EDITOR_WIDTH + OFFSET} ${EDITOR_WIDTH - currPoints.p1[1] * EDITOR_WIDTH + OFFSET}, ${
currPoints.p2[0] * EDITOR_WIDTH + OFFSET
} ${EDITOR_WIDTH - currPoints.p2[1] * EDITOR_WIDTH + OFFSET}, ${EDITOR_WIDTH + OFFSET} ${0 + OFFSET}`}
stroke="#ffffff"
fill="transparent"
/>
{/* Bottom left */}
<line
onPointerDown={() => {
setC1Down(true);
}}
onPointerMove={e => {
e.stopPropagation;
}}
onPointerUp={() => {
setC1Down(false);
}}
x1={`${0 + OFFSET}`}
y1={`${EDITOR_WIDTH + OFFSET}`}
x2={`${currPoints.p1[0] * EDITOR_WIDTH + OFFSET}`}
y2={`${EDITOR_WIDTH - currPoints.p1[1] * EDITOR_WIDTH + OFFSET}`}
stroke="#00000000"
strokeWidth="5"
/>
<line x1={`${0 + OFFSET}`} y1={`${EDITOR_WIDTH + OFFSET}`} x2={`${currPoints.p1[0] * EDITOR_WIDTH + OFFSET}`} y2={`${EDITOR_WIDTH - currPoints.p1[1] * EDITOR_WIDTH + OFFSET}`} stroke="#ffffff" strokeWidth="1" />
<circle
cx={`${currPoints.p1[0] * EDITOR_WIDTH + OFFSET}`}
cy={`${EDITOR_WIDTH - currPoints.p1[1] * EDITOR_WIDTH + OFFSET}`}
r="5"
fill={`${c1Down ? '#3fa9ff' : '#ffffff'}`}
onPointerDown={e => {
e.stopPropagation();
setC1Down(true);
}}
onPointerUp={() => {
setC1Down(false);
}}
/>
{/* Top right */}
<line
onPointerDown={e => {
e.stopPropagation();
setC2Down(true);
}}
onPointerUp={() => {
setC2Down(false);
}}
x1={`${EDITOR_WIDTH + OFFSET}`}
y1={`${0 + OFFSET}`}
x2={`${currPoints.p2[0] * EDITOR_WIDTH + OFFSET}`}
y2={`${EDITOR_WIDTH - currPoints.p2[1] * EDITOR_WIDTH + OFFSET}`}
stroke="#00000000"
strokeWidth="5"
/>
<line x1={`${EDITOR_WIDTH + OFFSET}`} y1={`${0 + OFFSET}`} x2={`${currPoints.p2[0] * EDITOR_WIDTH + OFFSET}`} y2={`${EDITOR_WIDTH - currPoints.p2[1] * EDITOR_WIDTH + OFFSET}`} stroke="#ffffff" strokeWidth="1" />
<circle
cx={`${currPoints.p2[0] * EDITOR_WIDTH + OFFSET}`}
cy={`${EDITOR_WIDTH - currPoints.p2[1] * EDITOR_WIDTH + OFFSET}`}
r="5"
fill={`${c2Down ? '#3fa9ff' : '#ffffff'}`}
onPointerDown={e => {
e.stopPropagation();
setC2Down(true);
}}
onPointerUp={() => {
setC2Down(false);
}}
/>
</svg>
);
}
export default CubicBezierEditor;
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