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<svelte:options accessors={true} />
<script lang="ts">
import { createEventDispatcher, onDestroy, onMount, tick } from "svelte";
const dispatch = createEventDispatcher();
export let width = 0;
export let height = 0;
export let natural_width = 0;
export let natural_height = 0;
let boxes: Array<Array<number>> = [];
let points: Array<Array<number>> = [];
let canvas_container: HTMLElement;
let canvas: HTMLCanvasElement;
let ctx: CanvasRenderingContext2D | null;
let mouse_pressing: boolean = false;
let mouse_button: number;
let prev_x: number, prev_y: number;
let cur_x: number, cur_y: number;
let old_width = 0;
let old_height = 0;
let canvasObserver: ResizeObserver;
async function set_canvas_size(dimensions: {
width: number;
height: number;
}) {
await tick();
canvas.width = dimensions.width;
canvas.height = dimensions.height;
canvas.style.width = `${dimensions.width}px`;
canvas.style.height = `${dimensions.height}px`;
canvas.style.marginTop = `-${dimensions.height}px`;
}
export async function resize_canvas() {
if (width === old_width && height === old_height) return;
await set_canvas_size({ width: width, height: height });
draw_canvas();
setTimeout(() => {
old_height = height;
old_width = width;
}, 100);
clear();
}
export function clear() {
boxes = [];
points = [];
draw_canvas();
dispatch("change", points);
return true;
}
export function undo() {
boxes.pop();
points.pop();
draw_canvas();
dispatch("change", points);
return true;
}
onMount(async () => {
ctx = canvas.getContext("2d");
if (ctx) {
(ctx.lineJoin = "round"), (ctx.lineCap = "round");
ctx.strokeStyle = "#000";
}
canvasObserver = new ResizeObserver(() => {
resize_canvas();
});
canvasObserver.observe(canvas_container);
draw_loop();
clear();
});
onDestroy(() => {
canvasObserver.unobserve(canvas_container);
});
function get_mouse_pos(e: MouseEvent | TouchEvent | FocusEvent) {
const rect = canvas.getBoundingClientRect();
let screenX, screenY: number;
if (e instanceof MouseEvent) {
screenX = e.clientX;
screenY = e.clientY;
} else if (e instanceof TouchEvent) {
screenX = e.changedTouches[0].clientX;
screenY = e.changedTouches[0].clientY;
} else {
return { x: prev_x, y: prev_y };
}
return { x: screenX - rect.left, y: screenY - rect.top };
}
function handle_draw_start(e: MouseEvent | TouchEvent) {
e.preventDefault();
(mouse_pressing = true), (mouse_button = 0);
if (e instanceof MouseEvent) mouse_button = e.button;
const { x, y } = get_mouse_pos(e);
(prev_x = x), (prev_y = y);
}
function handle_draw_move(e: MouseEvent | TouchEvent) {
e.preventDefault();
const { x, y } = get_mouse_pos(e);
(cur_x = x), (cur_y = y);
}
function handle_draw_end(e: MouseEvent | TouchEvent | FocusEvent) {
e.preventDefault();
if (mouse_pressing) {
const { x, y } = get_mouse_pos(e);
let x1 = Math.min(prev_x, x);
let y1 = Math.min(prev_y, y);
let x2 = Math.max(prev_x, x);
let y2 = Math.max(prev_y, y);
boxes.push([x1, y1, x2, y2]);
let scale_x = natural_width / width;
let scale_y = natural_height / height;
let is_point = x1 == x2 && y1 == y2;
points.push([
Math.round(x1 * scale_x),
Math.round(y1 * scale_y),
is_point ? (mouse_button == 0 ? 1 : 0) : 2, // label1
is_point ? 0 : Math.round(x2 * scale_x),
is_point ? 0 : Math.round(y2 * scale_y),
is_point ? 4 : 3, // label2
]);
dispatch("change", points);
}
mouse_pressing = false;
}
function draw_loop() {
draw_canvas();
window.requestAnimationFrame(() => {
draw_loop();
});
}
function draw_canvas() {
if (!ctx) return;
ctx.clearRect(0, 0, width, height);
if (mouse_pressing && cur_x != prev_x && prev_y != cur_y) {
let boxes_temp = boxes.slice();
boxes_temp.push([prev_x, prev_y, cur_x, cur_y]);
draw_boxes(boxes_temp);
draw_points(boxes);
} else {
draw_boxes(boxes);
draw_points(boxes);
}
}
function draw_boxes(boxes: Array<Array<number>>) {
if (!ctx) return;
ctx.fillStyle = "rgba(0, 0, 0, 0.1)";
ctx.beginPath();
boxes.forEach((box: Array<number>) => {
if (box[0] != box[2] && box[1] != box[3]) {
ctx.rect(box[0], box[1], box[2] - box[0], box[3] - box[1]);
}
});
ctx.fill();
ctx.stroke();
}
function draw_points(boxes: Array<Array<number>>) {
if (!ctx) return;
// Draw foreground points.
ctx.beginPath();
ctx.fillStyle = "rgba(0, 255, 255, 1.0)"; // Cyan.
boxes.forEach((box: Array<number>, index: number) => {
if (points[index][2] == 1) {
let radius = Math.sqrt(width * height) * 0.01;
ctx.moveTo(box[0] + radius, box[1]);
ctx.arc(box[0], box[1], radius, 0, 2 * Math.PI, false);
}
});
ctx.fill();
ctx.stroke();
// Draw background points.
ctx.beginPath();
ctx.fillStyle = "rgba(255, 192, 203, 1.0)"; // Pink.
boxes.forEach((box: Array<number>, index: number) => {
if (points[index][2] == 0) {
let radius = Math.sqrt(width * height) * 0.01;
ctx.moveTo(box[0] + radius, box[1]);
ctx.arc(box[0], box[1], radius, 0, 2 * Math.PI, false);
}
});
ctx.fill();
ctx.stroke();
}
</script>
<div class="wrap" bind:this={canvas_container}>
<canvas
bind:this={canvas}
on:mousedown={handle_draw_start}
on:mousemove={handle_draw_move}
on:mouseout={handle_draw_move}
on:mouseup={handle_draw_end}
on:touchstart={handle_draw_start}
on:touchmove={handle_draw_move}
on:touchend={handle_draw_end}
on:touchcancel={handle_draw_end}
on:blur={handle_draw_end}
on:click|stopPropagation
style=" z-index: 15"
/>
</div>
<style>
canvas {
display: block;
position: absolute;
top: 0;
right: 0;
bottom: 0;
left: 0;
margin: auto;
}
.wrap {
position: relative;
width: var(--size-full);
height: var(--size-full);
touch-action: none;
}
</style>
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