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<script lang="ts">
import { Toolbar, IconButton } from "@gradio/atoms";
import { Sketch, Square, Trash } from "@gradio/icons";
import { type AnnotatedImage, type Annotation, clamp } from "./utils";
import BoxCursor from "./BoxCursor.svelte";
import BoxPreview from "./BoxPreview.svelte";
export let value: null | AnnotatedImage = null;
export let interactive: boolean = false;
export let show_legend: boolean = true;
export let categories: string[] = [];
export let colorMap: { [key: string]: string } = {};
// Image coordinates and scale information.
type ImageRect = {
left: number;
top: number;
right: number;
bottom: number;
width: number;
height: number;
naturalWidth: number;
naturalHeight: number;
};
let imageRect: ImageRect = {
left: 0,
top: 0,
right: 1,
bottom: 1,
width: 1,
height: 1,
naturalWidth: 2,
naturalHeight: 2,
};
let imageFrame: HTMLDivElement;
let imageElement: HTMLImageElement;
// Display coordinates of the annotations.
let displayAnnotations: Annotation[] = [];
// Cursor box position in display coordinates.
let cursor: BoxCursor;
// State variables.
let selected: number | null = null;
let inserting: boolean = false;
let currentCategory: string = "";
// Attach resize observer to the image element position and size.
function onResize(node: HTMLDivElement) {
const resizeObserver = new ResizeObserver(() => {
imageRect = {
left: imageElement.offsetLeft,
top: imageElement.offsetTop,
right: imageElement.offsetLeft + imageElement.offsetWidth,
bottom: imageElement.offsetTop + imageElement.offsetHeight,
width: imageElement.offsetWidth,
height: imageElement.offsetHeight,
naturalWidth: imageElement.naturalWidth,
naturalHeight: imageElement.naturalHeight,
};
});
resizeObserver.observe(node);
return {
destroy() { resizeObserver.disconnect(); }
};
}
// Resize annotations to the display size and positions.
function updateDisplayAnnotations(value: AnnotatedImage | null, imageRect: ImageRect) {
displayAnnotations = value?.annotations.map((annotation) => {
return {
left: annotation.left / (imageRect.naturalWidth - 1) * imageRect.width + imageRect.left,
top: annotation.top / (imageRect.naturalHeight - 1) * imageRect.height + imageRect.top,
right: annotation.right / (imageRect.naturalWidth - 1) * imageRect.width + imageRect.left,
bottom: annotation.bottom / (imageRect.naturalHeight - 1) * imageRect.height + imageRect.top,
label: annotation.label,
} as Annotation;
}) || [];
if (selected !== null) {
cursor.setPosition(displayAnnotations[selected])
}
}
$: updateDisplayAnnotations(value, imageRect);
// Select an annotation box and show a cursor box.
function onSelect(event: MouseEvent, index: number) {
if (inserting) return;
selected = index;
cursor.setPosition(displayAnnotations[selected])
event.stopPropagation();
cursor.emitCursorMousedown({ clientX: event.clientX, clientY: event.clientY });
}
// Add a new annotation box if inserting, otherwise cancel the selection.
function onFrameMousedown(event: MouseEvent) {
if (!value) return;
// Cancel the selection if the click is outside the boxes.
selected = null;
if (!inserting) return;
// Add a new annotation box on insertion mode.
const rect = imageFrame.getBoundingClientRect();
const point = {
left: (event.clientX - rect.left - imageRect.left) / imageRect.width * (imageRect.naturalWidth - 1),
top: (event.clientY - rect.top - imageRect.top) / imageRect.height * (imageRect.naturalHeight - 1),
};
value.annotations.push({
left: clamp(point.left, 0, imageRect.naturalWidth - 1),
top: clamp(point.top, 0, imageRect.naturalHeight - 1),
right: clamp(point.left, 0, imageRect.naturalWidth - 1),
bottom: clamp(point.top, 0, imageRect.naturalHeight - 1),
label: currentCategory || null,
});
selected = value.annotations.length - 1;
updateDisplayAnnotations(value, imageRect);
inserting = false;
currentCategory = "";
cursor.emitAnchorMousedown("se", { clientX: event.clientX, clientY: event.clientY });
}
// Update the annotation box position when the cursor box changes.
function onCursorChange(): void {
if (value !== null && selected !== null) {
// Transform from the display coordinates to the image coordinates.
const position = cursor.getPosition();
const rect = {
left: (position.left - imageRect.left) / imageRect.width * (imageRect.naturalWidth - 1),
top: (position.top - imageRect.top) / imageRect.height * (imageRect.naturalHeight - 1),
right: (position.right - imageRect.left) / imageRect.width * (imageRect.naturalWidth - 1),
bottom: (position.bottom - imageRect.top) / imageRect.height * (imageRect.naturalHeight - 1),
}
value.annotations[selected].left = clamp(Math.round(rect.left), 0, imageRect.naturalWidth - 1);
value.annotations[selected].top = clamp(Math.round(rect.top), 0, imageRect.naturalHeight - 1);
value.annotations[selected].right = clamp(Math.round(rect.right), 0, imageRect.naturalWidth - 1);
value.annotations[selected].bottom = clamp(Math.round(rect.bottom), 0, imageRect.naturalHeight - 1);
}
}
// Remove an annotation box.
function removeAnnotation(): void {
// TODO: Invoke when the delete key is pressed.
if (value !== null && selected !== null) {
value.annotations.splice(selected, 1);
selected = null;
value = value;
}
}
// Switch to the inserting mode.
function onClickInsertion(label: string): void {
selected = null;
inserting = (inserting && currentCategory === label) ? false : true;
currentCategory = label;
}
// Update categories on value change.
function updateLabels(value: AnnotatedImage | null) {
if (value) {
for (let annotation of value.annotations) {
const label = annotation.label || "";
if (!categories.includes(label)) {
categories.push(label);
}
}
categories = categories;
}
}
$: updateLabels(value);
// Update colormap on categories change.
function updateColorMap(categories: string[]) {
for (let label of categories) {
if (!colorMap[label]) {
const index = Object.keys(colorMap).length;
const hue = Math.round((index + 4) / 8 * 360) % 360; // Start from blue.
colorMap[label] = `hsl(${hue}, 100%, 50%)`;
}
}
colorMap = colorMap;
}
$: updateColorMap(categories);
</script>
{#if value !== null}
<!-- svelte-ignore a11y-no-static-element-interactions -->
<!-- svelte-ignore a11y-click-events-have-key-events -->
<div
bind:this={imageFrame}
class="image-frame"
use:onResize
on:mousedown|stopPropagation|preventDefault={onFrameMousedown}
>
<img
bind:this={imageElement}
class:inserting={interactive && inserting}
src={value.image.url}
alt="background"
loading="lazy"
/>
{#each displayAnnotations as annotation, index}
<BoxPreview
{annotation}
{interactive}
selectable={!inserting}
active={!interactive || selected !== index}
--box-color={colorMap[annotation.label || ""]}
--cursor={inserting ? "crosshair" : "default"}
on:mousedown={(event) => {if (interactive && !inserting) onSelect(event, index)}}
/>
{/each}
<BoxCursor
bind:this={cursor}
active={interactive && selected !== null}
frame={imageRect}
--box-color={selected !== null ? colorMap[value.annotations[selected]?.label || ""] : "white"}
on:change={onCursorChange}
/>
</div>
{#if interactive}
<Toolbar show_border={true}>
{#each categories as category}
<IconButton
Icon={(categories.length > 1) ? Square : Sketch}
show_label={categories.length > 1}
label={category}
size="medium"
padded={true}
hasPopup={true}
highlight={inserting && category === currentCategory}
color={colorMap[category] || "white"}
on:click={() => { onClickInsertion(category); }}
/>
{/each}
<IconButton
Icon={Trash}
label="Remove"
size="medium"
padded={true}
disabled={selected === null}
on:click={removeAnnotation}
/>
</Toolbar>
{:else if show_legend && categories.length > 0}
<Toolbar show_border={true}>
{#each categories as category}
<IconButton
Icon={Square}
show_label={true}
label={category}
size="medium"
padded={true}
color={colorMap[category] || "white"}
/>
{/each}
</Toolbar>
{/if}
{/if}
<style>
.image-frame {
position: relative;
width: 100%;
height: 100%;
padding: 10px;
}
.image-frame :global(img) {
width: var(--size-full);
height: var(--size-full);
object-fit: contain;
user-select: none;
-moz-user-select: none;
-webkit-user-drag: none;
}
.inserting {
cursor: crosshair;
}
</style>
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