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feat: add value as a prop #3

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ccea020
feat: add value as a prop
ahmetuysal Mar 19, 2024
1633122
rerender circle when value changes
ahmetuysal Mar 19, 2024
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81 changes: 40 additions & 41 deletions src/index.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -10,13 +10,48 @@ export type ColorWheelProps = Omit<ComponentProps<'div'>, 'color'> & {
color?: {hue: number, saturation: number, value: number};
defaultColor?: {hue: number, saturation: number, value: number};
onChange?: (colors: { hue: number; saturation: number; value: number }[]) => void;
value?: number
}

export const ColorWheel = ({ radius, harmony: harmonyName, color, defaultColor, onChange, ...props }: ColorWheelProps) => {
export const ColorWheel = ({ radius, harmony: harmonyName, color, defaultColor, onChange, value = 1.0, ...props }: ColorWheelProps) => {
const ref = useRef<HTMLCanvasElement>(null);
const [position, setPosition] = useState(defaultColor ? hsv2xy(defaultColor.hue, defaultColor.saturation, defaultColor.value, radius) : hsv2xy(0, 1, 1, radius));
const [position, setPosition] = useState(defaultColor ? hsv2xy(defaultColor.hue, defaultColor.saturation, defaultColor.value, radius) : hsv2xy(0, 1, value, radius));
const harmony = useMemo(() => harmonies[harmonyName], [harmonies, harmonyName]);

const drawCircle = useCallback((ctx: CanvasRenderingContext2D) => {
let image = ctx.createImageData(2 * radius, 2 * radius);
let data = image.data;

for (let x = -radius; x < radius; x++) {
for (let y = -radius; y < radius; y++) {
let [r, phi] = xy2polar(x, y);

let deg = rad2deg(phi);

// Figure out the starting index of this pixel in the image data array.
let rowLength = 2 * radius;
let adjustedX = x + radius; // convert x from [-50, 50] to [0, 100] (the coordinates of the image data array)
let adjustedY = y + radius; // convert y from [-50, 50] to [0, 100] (the coordinates of the image data array)
let pixelWidth = 4; // each pixel requires 4 slots in the data array
let index = (adjustedX + adjustedY * rowLength) * pixelWidth;

let hue = deg;
let saturation = r / radius;

let [red, green, blue] = hsv2rgb(hue, saturation, value);
let alpha = 255;

data[index] = red;
data[index + 1] = green;
data[index + 2] = blue;
data[index + 3] = alpha;
}
}

ctx.putImageData(image, 0, 0);
}, [radius, value]);


useEffect(() => {
if (!ref.current) return;
const ctx = ref.current.getContext('2d');
Expand All @@ -27,7 +62,7 @@ export const ColorWheel = ({ radius, harmony: harmonyName, color, defaultColor,
ctx.canvas.height = radius * 2

drawCircle(ctx);
}, []);
}, [drawCircle]);

useEffect(() => {
if (color) {
Expand Down Expand Up @@ -56,7 +91,6 @@ export const ColorWheel = ({ radius, harmony: harmonyName, color, defaultColor,

const hue = rad2deg(phi);
const saturation = r / radius;
const value = 1.0;

const colors = harmony.map(harmonyHue => {
let newHue = (hue + harmonyHue) % 360;
Expand All @@ -69,44 +103,9 @@ export const ColorWheel = ({ radius, harmony: harmonyName, color, defaultColor,
onChange?.([{ hue, saturation, value }, ...colors]);

return colors;
}, [position, harmony, polar2xy, onChange, xy2polar, rad2deg, radius]);


const drawCircle = useCallback((ctx: CanvasRenderingContext2D) => {
let image = ctx.createImageData(2 * radius, 2 * radius);
let data = image.data;

for (let x = -radius; x < radius; x++) {
for (let y = -radius; y < radius; y++) {
let [r, phi] = xy2polar(x, y);

let deg = rad2deg(phi);

// Figure out the starting index of this pixel in the image data array.
let rowLength = 2 * radius;
let adjustedX = x + radius; // convert x from [-50, 50] to [0, 100] (the coordinates of the image data array)
let adjustedY = y + radius; // convert y from [-50, 50] to [0, 100] (the coordinates of the image data array)
let pixelWidth = 4; // each pixel requires 4 slots in the data array
let index = (adjustedX + adjustedY * rowLength) * pixelWidth;

let hue = deg;
let saturation = r / radius;
let value = 1.0;

let [red, green, blue] = hsv2rgb(hue, saturation, value);
let alpha = 255;

data[index] = red;
data[index + 1] = green;
data[index + 2] = blue;
data[index + 3] = alpha;
}
}

ctx.putImageData(image, 0, 0);
}, [radius]);
}, [position, harmony, polar2xy, onChange, xy2polar, rad2deg, radius, value]);

const [r, g, b] = useMemo(() => xy2rgb(position.x, position.y, radius), [position, radius]);
const [r, g, b] = useMemo(() => xy2rgb(position.x, position.y, radius, value), [position, radius, value]);

return (
<div
Expand Down
3 changes: 1 addition & 2 deletions src/utils.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -58,15 +58,14 @@ export const hsv2rgb = (hue: number, saturation: number, value: number): [number
return [255 * r, 255 * g, 255 * b];
}

export const xy2rgb = (x: number, y: number, radius: number) => {
export const xy2rgb = (x: number, y: number, radius: number, value: number = 1.0) => {
x -= radius;
y -= radius;

const [r, phi] = xy2polar(x, y);

const hue = rad2deg(phi);
const saturation = r / radius;
const value = 1.0;

return hsv2rgb(hue, saturation, value);
}
Expand Down