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<script lang="ts">
import { onMount, createEventDispatcher } from "svelte";
import AnnotatedImageData from "./AnnotatedImageData";
export let value: null | AnnotatedImageData;
export let src: string | null = null;
export let interactive: boolean = true;
export let height: number | string = "100%";
export let width: number | string = "100%";
export let imgSize: number | null = null;
export let patchSize: number = 16;
export let showGrid: boolean = true;
export let gridColor: string = "rgba(200, 200, 200, 0.5)";
let canvas: HTMLCanvasElement;
let ctx: CanvasRenderingContext2D;
let image: HTMLImageElement | null = null;
let imageWidth = 0;
let imageHeight = 0;
let canvasXmin = 0;
let canvasYmin = 0;
let scaleFactor = 1.0;
let effectiveWidth = 0;
let effectiveHeight = 0;
let gridScaleX = 1.0;
let gridScaleY = 1.0;
const dispatch = createEventDispatcher<{
patch_select: object;
}>();
function drawGrid() {
if (!ctx || !image || !showGrid) return;
ctx.save();
ctx.strokeStyle = gridColor;
ctx.lineWidth = 1;
// Calculate grid dimensions using shared variables
const gridWidth = Math.floor(effectiveWidth / patchSize);
const gridHeight = Math.floor(effectiveHeight / patchSize);
console.log(`[PatchSelector.svelte:drawGrid] patch size: ${patchSize}`);
// Draw horizontal lines
for (let i = 0; i <= gridHeight; i++) {
const y = canvasYmin + (i * patchSize * gridScaleY);
ctx.beginPath();
ctx.moveTo(canvasXmin, y);
ctx.lineTo(canvasXmin + imageWidth, y);
ctx.stroke();
}
// Draw vertical lines
for (let i = 0; i <= gridWidth; i++) {
const x = canvasXmin + (i * patchSize * gridScaleX);
ctx.beginPath();
ctx.moveTo(x, canvasYmin);
ctx.lineTo(x, canvasYmin + imageHeight);
ctx.stroke();
}
ctx.restore();
}
function handleImageLoad() {
if (!canvas) return;
console.debug("[PatchSelector.svelte:handleImageLoad] Image loaded");
ctx = canvas.getContext("2d");
// Set canvas dimensions based on image
scaleFactor = 1;
canvas.width = canvas.clientWidth;
if (image !== null) {
// Use imgSize if provided, otherwise use the natural dimensions
effectiveWidth = imgSize || image.width;
effectiveHeight = imgSize || image.height;
if (imgSize) {
// If imgSize is provided, use a square dimension
effectiveWidth = imgSize;
effectiveHeight = imgSize;
}
if (effectiveWidth > canvas.width) {
scaleFactor = canvas.width / effectiveWidth;
imageWidth = effectiveWidth * scaleFactor;
imageHeight = effectiveHeight * scaleFactor;
canvasXmin = 0;
canvasYmin = 0;
} else {
imageWidth = effectiveWidth;
imageHeight = effectiveHeight;
canvasXmin = (canvas.width - imageWidth) / 2;
canvasYmin = 0;
}
canvas.height = imageHeight;
// Calculate grid scale factors once
gridScaleX = imageWidth / effectiveWidth;
gridScaleY = imageHeight / effectiveHeight;
} else {
canvas.height = canvas.clientHeight;
}
draw();
}
function draw() {
if (!ctx) return;
console.debug("Drawing on canvas");
ctx.clearRect(0, 0, canvas.width, canvas.height);
if (image !== null) {
// Draw the image
console.debug(`[PatchSelector.svelte:draw] Drawing image`);
console.debug(`[PatchSelector.svelte:draw] image dimensions: ${image.width}x${image.height}:${imgSize}`);
console.debug(`[PatchSelector.svelte:draw] image sizes: ${imageWidth}x${imageHeight}:${imgSize}`);
console.debug(`[PatchSelector.svelte:draw] effective image sizes: ${effectiveWidth}x${effectiveHeight}:${imgSize}`);
ctx.drawImage(image, canvasXmin, canvasYmin, imageWidth, imageHeight);
console.debug("Drawing grid");
// Draw the grid overlay
drawGrid();
}
}
function handleClick(event: MouseEvent) {
if (!interactive || !image) return;
const rect = canvas.getBoundingClientRect();
const mouseX = event.clientX - rect.left;
const mouseY = event.clientY - rect.top;
// Calculate which grid cell/patch was clicked using shared variables
const x = Math.floor((mouseX - canvasXmin) / (patchSize * gridScaleX));
const y = Math.floor((mouseY - canvasYmin) / (patchSize * gridScaleY));
// Calculate the grid dimensions
const gridWidth = Math.floor(effectiveWidth / patchSize);
// Calculate the linear patch index (row-major order)
const patchIndex = y * gridWidth + x;
// Only dispatch if the click is within the image bounds
if (x >= 0 && x < gridWidth && y >= 0 && y < Math.floor(effectiveHeight / patchSize)) {
// Highlight the selected patch
highlightPatch(x, y);
console.debug("[PatchSelector.svelte:handleClick] Patch index:", patchIndex);
// Dispatch the patch_select event with the patch index
value.patchIndex = patchIndex;
dispatch("patch_select", { patchIndex });
}
}
function highlightPatch(gridX: number, gridY: number) {
if (!ctx || !image) return;
// Clear the previous drawing
draw();
// Highlight the selected patch using shared variables
ctx.save();
ctx.fillStyle = "rgba(255, 255, 0, 0.2)";
ctx.fillRect(
canvasXmin + gridX * patchSize * gridScaleX,
canvasYmin + gridY * patchSize * gridScaleY,
patchSize * gridScaleX,
patchSize * gridScaleY
);
ctx.restore();
}
// Update imgSize and patchSize when they change in the value object
$: if (value?.imgSize !== undefined && value.imgSize !== null) {
console.log(`[PatchSelector.svelte] Changing patch size: ${imgSize} -> ${value.imgSize}`);
imgSize = value.imgSize;
}
$: if (value?.patchSize !== undefined && value.patchSize !== null) {
console.log(`[PatchSelector.svelte] Changing patch size: ${patchSize} -> ${value.patchSize}`);
patchSize = value.patchSize;
}
// Redraw when patch size or image size changes
$: if (image && (patchSize || imgSize)) {
console.log(`[PatchSelector.svelte] Redrawing canvas with new patch size: ${patchSize}`);
handleImageLoad();
}
$: if (src) {
image = new Image();
image.src = src;
image.onload = handleImageLoad;
}
onMount(() => {
if (image && image.complete) {
handleImageLoad();
}
});
</script>
<div class="patch-selector-container">
<canvas
bind:this={canvas}
on:click={handleClick}
style="height: {height}; width: {width};"
class="patch-selector-canvas"
></canvas>
</div>
<style>
.patch-selector-container {
display: flex;
justify-content: center;
align-items: center;
}
.patch-selector-canvas {
border-color: var(--block-border-color);
width: 100%;
height: 100%;
display: block;
touch-action: none;
}
</style>
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