Press n or j to go to the next uncovered block, b, p or k for the previous block.
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export type Source = CanvasImageSource & { width: number; height: number };
export const normRect = (
x1: number,
y1: number,
x2: number,
y2: number,
): Rect => ({
x: Math.min(x1, x2),
y: Math.min(y1, y2),
w: Math.abs(x2 - x1),
h: Math.abs(y2 - y1),
});
export type Handle = 'nw' | 'n' | 'ne' | 'e' | 'se' | 's' | 'sw' | 'w';
export const HANDLES: Handle[] = ['nw', 'n', 'ne', 'e', 'se', 's', 'sw', 'w'];
export const HANDLE_CURSOR: Record<Handle, string> = {
n: 'ns-resize',
s: 'ns-resize',
e: 'ew-resize',
w: 'ew-resize',
nw: 'nwse-resize',
se: 'nwse-resize',
ne: 'nesw-resize',
sw: 'nesw-resize',
};
export function handlePoint(r: Rect, h: Handle): [number, number] {
return [
h.includes('w') ? r.x : h.includes('e') ? r.x + r.w : r.x + r.w / 2,
h.includes('n') ? r.y : h.includes('s') ? r.y + r.h : r.y + r.h / 2,
];
}
/** The edge or corner of `r` under (x, y); whole edges are grabbable, not just their midpoints. */
export function handleAt(r: Rect, x: number, y: number, tol: number) {
const inX = x >= r.x - tol && x <= r.x + r.w + tol;
const inY = y >= r.y - tol && y <= r.y + r.h + tol;
const v =
inX && Math.abs(y - r.y) <= tol
? 'n'
: inX && Math.abs(y - (r.y + r.h)) <= tol
? 's'
: '';
const h =
inY && Math.abs(x - r.x) <= tol
? 'w'
: inY && Math.abs(x - (r.x + r.w)) <= tol
? 'e'
: '';
return (v + h || undefined) as Handle | undefined;
}
/** Moves the edges named by `h` to (x, y); dragging past the opposite edge flips the rect. */
export function resizeRect(r: Rect, h: Handle, x: number, y: number) {
return normRect(
h.includes('w') ? x : r.x,
h.includes('n') ? y : r.y,
h.includes('e') ? x : r.x + r.w,
h.includes('s') ? y : r.y + r.h,
);
}
const font = (size: number) =>
`600 ${size}px ui-sans-serif, system-ui, -apple-system, "Segoe UI", sans-serif`;
function isLight(hex: string) {
const n = parseInt(hex.slice(1), 16);
return (
(0.299 * ((n >> 16) & 255) + 0.587 * ((n >> 8) & 255) + 0.114 * (n & 255)) /
255 >
0.6
);
}
function tracePath(ctx: CanvasRenderingContext2D, pts: number[]) {
ctx.beginPath();
ctx.moveTo(pts[0], pts[1]);
for (let i = 2; i < pts.length; i += 2) ctx.lineTo(pts[i], pts[i + 1]);
if (pts.length === 2) ctx.lineTo(pts[0] + 0.01, pts[1]);
}
export function drawShape(
ctx: CanvasRenderingContext2D,
s: Shape,
img: Source,
) {
const [x1, y1, x2, y2] = s.pts;
ctx.save();
ctx.strokeStyle = ctx.fillStyle = s.color;
ctx.lineWidth = s.size;
ctx.lineCap = ctx.lineJoin = 'round';
switch (s.kind) {
case 'rect': {
const r = normRect(x1, y1, x2, y2);
ctx.beginPath();
ctx.roundRect(r.x, r.y, r.w, r.h, s.size);
ctx.stroke();
break;
}
case 'ellipse': {
const r = normRect(x1, y1, x2, y2);
ctx.beginPath();
ctx.ellipse(
r.x + r.w / 2,
r.y + r.h / 2,
r.w / 2,
r.h / 2,
0,
0,
Math.PI * 2,
);
ctx.stroke();
break;
}
case 'line':
tracePath(ctx, s.pts);
ctx.stroke();
break;
case 'arrow': {
const angle = Math.atan2(y2 - y1, x2 - x1);
const head = Math.min(
Math.max(s.size * 4, 14),
Math.hypot(x2 - x1, y2 - y1),
);
ctx.beginPath();
ctx.moveTo(x1, y1);
ctx.lineTo(
x2 - Math.cos(angle) * head * 0.7,
y2 - Math.sin(angle) * head * 0.7,
);
ctx.stroke();
ctx.beginPath();
ctx.moveTo(x2, y2);
ctx.lineTo(
x2 - head * Math.cos(angle - 0.42),
y2 - head * Math.sin(angle - 0.42),
);
ctx.lineTo(
x2 - head * Math.cos(angle + 0.42),
y2 - head * Math.sin(angle + 0.42),
);
ctx.closePath();
ctx.lineWidth = s.size / 2;
ctx.fill();
ctx.stroke();
break;
}
case 'pen':
tracePath(ctx, s.pts);
ctx.stroke();
break;
case 'highlight':
ctx.globalCompositeOperation = 'multiply';
ctx.globalAlpha = 0.45;
ctx.lineCap = 'butt';
tracePath(ctx, s.pts);
ctx.stroke();
break;
case 'blur': {
const r = normRect(x1, y1, x2, y2);
if (r.w < 1 || r.h < 1) break;
const tw = Math.max(1, Math.ceil(r.w / s.size));
const th = Math.max(1, Math.ceil(r.h / s.size));
const tmp = new OffscreenCanvas(tw, th);
const t = tmp.getContext('2d')!;
// High quality averages each block; the default samples a few pixels and leaves speckles.
t.imageSmoothingQuality = 'high';
t.drawImage(img, r.x, r.y, r.w, r.h, 0, 0, tw, th);
ctx.imageSmoothingEnabled = false;
ctx.drawImage(tmp, 0, 0, tw, th, r.x, r.y, r.w, r.h);
break;
}
case 'text': {
ctx.font = font(s.size);
ctx.textBaseline = 'top';
ctx.lineWidth = s.size / 6;
ctx.strokeStyle = isLight(s.color)
? 'rgba(0,0,0,.55)'
: 'rgba(255,255,255,.9)';
(s.text ?? '').split('\n').forEach((line, i) => {
ctx.strokeText(line, x1, y1 + i * s.size * 1.25);
ctx.fillText(line, x1, y1 + i * s.size * 1.25);
});
break;
}
case 'step': {
ctx.shadowColor = 'rgba(0,0,0,.3)';
ctx.shadowBlur = s.size / 2;
ctx.beginPath();
ctx.arc(x1, y1, s.size, 0, Math.PI * 2);
ctx.fill();
ctx.shadowColor = 'transparent';
ctx.lineWidth = s.size * 0.14;
ctx.strokeStyle = '#fff';
ctx.stroke();
ctx.fillStyle = isLight(s.color) ? '#111' : '#fff';
ctx.font = `700 ${s.size * 1.05}px ui-sans-serif, system-ui, sans-serif`;
ctx.textAlign = 'center';
ctx.textBaseline = 'middle';
ctx.fillText(s.text ?? '', x1, y1 + s.size * 0.06);
break;
}
}
ctx.restore();
}
/** Draws `region` (image px) of image + shapes at `k` canvas px per image px. Leaves that transform applied. */
export function render(
canvas: HTMLCanvasElement,
img: Source,
shapes: Shape[],
region: Rect,
k = 1,
) {
const w = Math.max(1, Math.round(region.w * k));
const h = Math.max(1, Math.round(region.h * k));
if (canvas.width !== w) canvas.width = w;
if (canvas.height !== h) canvas.height = h;
const ctx = canvas.getContext('2d')!;
ctx.setTransform(k, 0, 0, k, -region.x * k, -region.y * k);
ctx.clearRect(region.x, region.y, region.w, region.h);
ctx.drawImage(
img,
region.x,
region.y,
region.w,
region.h,
region.x,
region.y,
region.w,
region.h,
);
for (const s of shapes) drawShape(ctx, s, img);
return ctx;
}
export function bounds(ctx: CanvasRenderingContext2D, s: Shape): Rect {
if (s.kind === 'text') {
ctx.save();
ctx.font = font(s.size);
const lines = (s.text ?? '').split('\n');
const w = Math.max(...lines.map((l) => ctx.measureText(l).width));
ctx.restore();
return { x: s.pts[0], y: s.pts[1], w, h: lines.length * s.size * 1.25 };
}
if (s.kind === 'step')
return {
x: s.pts[0] - s.size,
y: s.pts[1] - s.size,
w: s.size * 2,
h: s.size * 2,
};
const xs = s.pts.filter((_, i) => i % 2 === 0);
const ys = s.pts.filter((_, i) => i % 2 === 1);
const pad = s.kind === 'blur' ? 0 : s.size / 2;
const x = Math.min(...xs) - pad;
const y = Math.min(...ys) - pad;
return { x, y, w: Math.max(...xs) + pad - x, h: Math.max(...ys) + pad - y };
}
function distToSegment(
px: number,
py: number,
x1: number,
y1: number,
x2: number,
y2: number,
) {
const dx = x2 - x1;
const dy = y2 - y1;
const t =
dx || dy
? Math.max(
0,
Math.min(1, ((px - x1) * dx + (py - y1) * dy) / (dx * dx + dy * dy)),
)
: 0;
return Math.hypot(px - (x1 + t * dx), py - (y1 + t * dy));
}
export function hitTest(
ctx: CanvasRenderingContext2D,
shapes: Shape[],
x: number,
y: number,
tolerance: number,
) {
for (let i = shapes.length - 1; i >= 0; i--) {
const s = shapes[i];
if (
s.kind === 'line' ||
s.kind === 'arrow' ||
s.kind === 'pen' ||
s.kind === 'highlight'
) {
for (let j = 0; j + 1 < s.pts.length; j += 2) {
const [x2, y2] =
j + 3 < s.pts.length
? [s.pts[j + 2], s.pts[j + 3]]
: [s.pts[j], s.pts[j + 1]];
if (
distToSegment(x, y, s.pts[j], s.pts[j + 1], x2, y2) <=
s.size / 2 + tolerance
)
return s;
}
continue;
}
const b = bounds(ctx, s);
if (
x >= b.x - tolerance &&
x <= b.x + b.w + tolerance &&
y >= b.y - tolerance &&
y <= b.y + b.h + tolerance
)
return s;
}
return undefined;
}
/** Shift-drag: snap lines to 45° and boxes to squares. */
export function constrain(
kind: Shape['kind'],
x1: number,
y1: number,
x2: number,
y2: number,
): [number, number] {
const dx = x2 - x1;
const dy = y2 - y1;
if (kind === 'line' || kind === 'arrow') {
const a = (Math.round(Math.atan2(dy, dx) / (Math.PI / 4)) * Math.PI) / 4;
const len = Math.hypot(dx, dy);
return [x1 + Math.cos(a) * len, y1 + Math.sin(a) * len];
}
const m = Math.max(Math.abs(dx), Math.abs(dy));
return [x1 + Math.sign(dx || 1) * m, y1 + Math.sign(dy || 1) * m];
}
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