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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,8 +1,44 @@ | ||
| import type { box2D, vec2 } from '@alleninstitute/vis-geometry'; | ||
| import { Box2D, Vec2, type box2D, type vec2 } from '@alleninstitute/vis-geometry'; | ||
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| // a basic camera, for viewing slices | ||
| export type Camera = { | ||
| readonly view: box2D; // a view in 'data space' | ||
| readonly screen: vec2; // what that view projects to in display space, aka pixels | ||
| readonly projection: 'webImage' | 'cartesian'; | ||
| }; | ||
| /** | ||
| * Zooms relative to your current mouse position | ||
| * @param view your current view | ||
| * @param screenSize the size of your canvas/screen | ||
| * @param zoomScale the scale you want to apply to your view | ||
| * @param mousePos the offsetX and offsetY of your mouse | ||
| */ | ||
| export function zoom(view: box2D, screenSize: vec2, zoomScale: number, mousePos: vec2) { | ||
| // translate mouse pos to data space | ||
| // offset divided by screen size gives us a percentage of the canvas where the mouse is | ||
| // multiply percentage by view size to make it data space | ||
| // add offset of the min corner so that the position takes into account any box offset | ||
| const zoomPoint: vec2 = Vec2.add(view.minCorner, Vec2.mul(Vec2.div(mousePos, screenSize), Box2D.size(view))); | ||
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| // scale the box with our new zoom point as the center | ||
| const newView = Box2D.translate( | ||
| Box2D.scale(Box2D.translate(view, Vec2.scale(zoomPoint, -1)), [zoomScale, zoomScale]), | ||
| zoomPoint | ||
| ); | ||
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| return newView; | ||
| } | ||
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| /** | ||
| * | ||
| * @param view your current view | ||
| * @param screenSize the size of your screen/canvas | ||
| * @param mousePos your mouse position | ||
| * @returns new view that has your pan applied | ||
| */ | ||
| export function pan(view: box2D, screenSize: vec2, mousePos: vec2) { | ||
| const relativePos = Vec2.div(Vec2.mul(mousePos, [-1, -1]), screenSize); | ||
| const scaledOffset = Vec2.mul(relativePos, Box2D.size(view)); | ||
| const newView = Box2D.translate(view, scaledOffset); | ||
| return newView; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,81 @@ | ||
| import type { DziImage } from '@alleninstitute/vis-dzi'; | ||
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| // DZI files will come with XML or JSON to give you important information such as the width, height, and format. | ||
| // Below is a function for parsing an xml with that data, althought sometimes it comes in JSON format. | ||
| // At the end of the file you can see two examples of the metadata format you might see, one as XML and another as JSON | ||
| /** | ||
| * This function helps decode xml metadata for a dzi file. | ||
| * @param s xml string | ||
| * @param url url for dzi file | ||
| * @returns formatted dzi image data | ||
| */ | ||
| function decodeDziXml(s: string, url: string): DziImage | undefined { | ||
| const parser = new DOMParser(); | ||
| const doc = parser.parseFromString(s, 'text/xml'); | ||
| // catch any errors if the xml is malformed | ||
| const err = doc.querySelector('Error'); | ||
| if (err) return undefined; | ||
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| if (doc) { | ||
| const img = doc.getElementsByTagName('Image')[0]; | ||
| const size = doc.getElementsByTagName('Size')[0]; | ||
| // format: as jpg/png | ||
| // overlap: how much overlap there is between images so that we can compensate the rendering | ||
| // tile size: how big in pixels each tile is | ||
| const [format, overlap, tileSize] = [ | ||
| img.getAttribute('Format'), | ||
| img.getAttribute('Overlap'), | ||
| img.getAttribute('TileSize'), | ||
| ]; | ||
| if (size && format && overlap && tileSize) { | ||
| // width and height of the image, so we can properly size the view | ||
| const width = size.getAttribute('Width'); | ||
| const height = size.getAttribute('Height'); | ||
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| // the url ends with .dzi to denote that we're reaching for a dzi file | ||
| // in order to get the images from that url we need to remove the .dzi | ||
| // and replace it with _files/ so that the image viewer knows where to look | ||
| const dataLoc = url.split('.dzi')[0]; | ||
| if (width && height && dataLoc) { | ||
| return { | ||
| imagesUrl: `${dataLoc}_files/`, | ||
| format: format as 'jpeg' | 'png' | 'jpg' | 'JPG' | 'PNG', | ||
| overlap: Number.parseInt(overlap, 10), | ||
| tileSize: Number.parseInt(tileSize, 10), | ||
| size: { | ||
| width: Number.parseInt(width, 10), | ||
| height: Number.parseInt(height, 10), | ||
| }, | ||
| }; | ||
| } | ||
| } | ||
| } | ||
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| return undefined; | ||
| } | ||
|
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| /* Example XML | ||
| <?xml version="1.0" encoding="UTF-8"?> | ||
| <Image xmlns="http://schemas.microsoft.com/deepzoom/2008" | ||
| Format="jpg" | ||
| Overlap="2" | ||
| TileSize="256" > | ||
| <Size Height="9221" | ||
| Width="7026"/> | ||
| </Image> | ||
| */ | ||
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| /* Example JSON | ||
| { | ||
| "Image": { | ||
| "xmlns": "http://schemas.microsoft.com/deepzoom/2008", | ||
| "Format": "jpg", | ||
| "Overlap": "2", | ||
| "TileSize": "256", | ||
| "Size": { | ||
| "Height": "9221", | ||
| "Width": "7026" | ||
| } | ||
| } | ||
| } | ||
| */ |
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