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import {
COLOR_CHARCOAL_BLACK,
COLOR_VOICE_CALL,
COLOR_WHITE,
THEME,
UserIdleState,
} from "./constants";
import { roundRect } from "./renderer/roundRect";
import type { InteractiveCanvasRenderConfig } from "./scene/types";
import type {
Collaborator,
InteractiveCanvasAppState,
SocketId,
} from "./types";
function hashToInteger(id: string) {
let hash = 0;
if (id.length === 0) {
return hash;
}
for (let i = 0; i < id.length; i++) {
const char = id.charCodeAt(i);
hash = (hash << 5) - hash + char;
}
return hash;
}
export const getClientColor = (
socketId: SocketId,
collaborator: Collaborator | undefined,
) => {
// to get more even distribution in case `id` is not uniformly distributed to
// begin with, we hash it
const hash = Math.abs(hashToInteger(collaborator?.id || socketId));
// we want to get a multiple of 10 number in the range of 0-360 (in other
// words a hue value of step size 10). There are 37 such values including 0.
const hue = (hash % 37) * 10;
const saturation = 100;
const lightness = 83;
return `hsl(${hue}, ${saturation}%, ${lightness}%)`;
};
/**
* returns first char, capitalized
*/
export const getNameInitial = (name?: string | null) => {
// first char can be a surrogate pair, hence using codePointAt
const firstCodePoint = name?.trim()?.codePointAt(0);
return (
firstCodePoint ? String.fromCodePoint(firstCodePoint) : "?"
).toUpperCase();
};
export const renderRemoteCursors = ({
context,
renderConfig,
appState,
normalizedWidth,
normalizedHeight,
}: {
context: CanvasRenderingContext2D;
renderConfig: InteractiveCanvasRenderConfig;
appState: InteractiveCanvasAppState;
normalizedWidth: number;
normalizedHeight: number;
}) => {
// Paint remote pointers
for (const [socketId, pointer] of renderConfig.remotePointerViewportCoords) {
let { x, y } = pointer;
const collaborator = appState.collaborators.get(socketId);
x -= appState.offsetLeft;
y -= appState.offsetTop;
const width = 11;
const height = 14;
const isOutOfBounds =
x < 0 ||
x > normalizedWidth - width ||
y < 0 ||
y > normalizedHeight - height;
x = Math.max(x, 0);
x = Math.min(x, normalizedWidth - width);
y = Math.max(y, 0);
y = Math.min(y, normalizedHeight - height);
const background = getClientColor(socketId, collaborator);
context.save();
context.strokeStyle = background;
context.fillStyle = background;
const userState = renderConfig.remotePointerUserStates.get(socketId);
const isInactive =
isOutOfBounds ||
userState === UserIdleState.IDLE ||
userState === UserIdleState.AWAY;
if (isInactive) {
context.globalAlpha = 0.3;
}
if (renderConfig.remotePointerButton.get(socketId) === "down") {
context.beginPath();
context.arc(x, y, 15, 0, 2 * Math.PI, false);
context.lineWidth = 3;
context.strokeStyle = "#ffffff88";
context.stroke();
context.closePath();
context.beginPath();
context.arc(x, y, 15, 0, 2 * Math.PI, false);
context.lineWidth = 1;
context.strokeStyle = background;
context.stroke();
context.closePath();
}
// TODO remove the dark theme color after we stop inverting canvas colors
const IS_SPEAKING_COLOR =
appState.theme === THEME.DARK ? "#2f6330" : COLOR_VOICE_CALL;
const isSpeaking = collaborator?.isSpeaking;
if (isSpeaking) {
// cursor outline for currently speaking user
context.fillStyle = IS_SPEAKING_COLOR;
context.strokeStyle = IS_SPEAKING_COLOR;
context.lineWidth = 10;
context.lineJoin = "round";
context.beginPath();
context.moveTo(x, y);
context.lineTo(x + 0, y + 14);
context.lineTo(x + 4, y + 9);
context.lineTo(x + 11, y + 8);
context.closePath();
context.stroke();
context.fill();
}
// Background (white outline) for arrow
context.fillStyle = COLOR_WHITE;
context.strokeStyle = COLOR_WHITE;
context.lineWidth = 6;
context.lineJoin = "round";
context.beginPath();
context.moveTo(x, y);
context.lineTo(x + 0, y + 14);
context.lineTo(x + 4, y + 9);
context.lineTo(x + 11, y + 8);
context.closePath();
context.stroke();
context.fill();
// Arrow
context.fillStyle = background;
context.strokeStyle = background;
context.lineWidth = 2;
context.lineJoin = "round";
context.beginPath();
if (isInactive) {
context.moveTo(x - 1, y - 1);
context.lineTo(x - 1, y + 15);
context.lineTo(x + 5, y + 10);
context.lineTo(x + 12, y + 9);
context.closePath();
context.fill();
} else {
context.moveTo(x, y);
context.lineTo(x + 0, y + 14);
context.lineTo(x + 4, y + 9);
context.lineTo(x + 11, y + 8);
context.closePath();
context.fill();
context.stroke();
}
const username = renderConfig.remotePointerUsernames.get(socketId) || "";
if (!isOutOfBounds && username) {
context.font = "600 12px sans-serif"; // font has to be set before context.measureText()
const offsetX = (isSpeaking ? x + 0 : x) + width / 2;
const offsetY = (isSpeaking ? y + 0 : y) + height + 2;
const paddingHorizontal = 5;
const paddingVertical = 3;
const measure = context.measureText(username);
const measureHeight =
measure.actualBoundingBoxDescent + measure.actualBoundingBoxAscent;
const finalHeight = Math.max(measureHeight, 12);
const boxX = offsetX - 1;
const boxY = offsetY - 1;
const boxWidth = measure.width + 2 + paddingHorizontal * 2 + 2;
const boxHeight = finalHeight + 2 + paddingVertical * 2 + 2;
if (context.roundRect) {
context.beginPath();
context.roundRect(boxX, boxY, boxWidth, boxHeight, 8);
context.fillStyle = background;
context.fill();
context.strokeStyle = COLOR_WHITE;
context.stroke();
if (isSpeaking) {
context.beginPath();
context.roundRect(boxX - 2, boxY - 2, boxWidth + 4, boxHeight + 4, 8);
context.strokeStyle = IS_SPEAKING_COLOR;
context.stroke();
}
} else {
roundRect(context, boxX, boxY, boxWidth, boxHeight, 8, COLOR_WHITE);
}
context.fillStyle = COLOR_CHARCOAL_BLACK;
context.fillText(
username,
offsetX + paddingHorizontal + 1,
offsetY +
paddingVertical +
measure.actualBoundingBoxAscent +
Math.floor((finalHeight - measureHeight) / 2) +
2,
);
// draw three vertical bars signalling someone is speaking
if (isSpeaking) {
context.fillStyle = IS_SPEAKING_COLOR;
const barheight = 8;
const margin = 8;
const gap = 5;
context.fillRect(
boxX + boxWidth + margin,
boxY + (boxHeight / 2 - barheight / 2),
2,
barheight,
);
context.fillRect(
boxX + boxWidth + margin + gap,
boxY + (boxHeight / 2 - (barheight * 2) / 2),
2,
barheight * 2,
);
context.fillRect(
boxX + boxWidth + margin + gap * 2,
boxY + (boxHeight / 2 - barheight / 2),
2,
barheight,
);
}
}
context.restore();
context.closePath();
}
};
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