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DICOM overlays #347

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DICOM overlays #347

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f6376c4
DICOM overlays
kofifus Jan 31, 2019
86126af
Update drawImageSync.js
kofifus Jan 31, 2019
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51 changes: 51 additions & 0 deletions src/internal/drawImageSync.js
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Original file line number Diff line number Diff line change
Expand Up @@ -6,6 +6,56 @@ import { renderPseudoColorImage } from '../rendering/renderPseudoColorImage.js';
import { renderLabelMapImage } from '../rendering/renderLabelMapImage.js';
import triggerEvent from '../triggerEvent.js';
import EVENTS from '../events.js';
import getTransform from './getTransform.js';

function renderOverlays(enabledElement, overlays) {
if (!overlays || overlays.length === 0) {
return;
}

const imageWidth = Math.abs(enabledElement.viewport.displayedArea.brhc.x - enabledElement.viewport.displayedArea.tlhc.x) * enabledElement.viewport.displayedArea.columnPixelSpacing;
const imageHeight = Math.abs(enabledElement.viewport.displayedArea.brhc.y - enabledElement.viewport.displayedArea.tlhc.y) * enabledElement.viewport.displayedArea.rowPixelSpacing;

const context = enabledElement.canvas.getContext('2d');

context.save();

overlays.forEach((overlay) => {
if (!overlay.visible) {
return;
}
const layerCanvas = document.createElement('canvas');

layerCanvas.width = imageWidth;
layerCanvas.height = imageHeight;
const layerContext = layerCanvas.getContext('2d');
const transform = getTransform(enabledElement);

layerContext.setTransform(transform.m[0], transform.m[1], transform.m[2], transform.m[3], transform.m[4], transform.m[5]);
layerContext.save();
layerContext.setTransform(1, 0, 0, 1, 0, 0);
layerContext.fillStyle = overlay.fillStyle;

if (overlay.type === 'R') {
layerContext.fillRect(0, 0, layerCanvas.width, layerCanvas.height);
layerContext.globalCompositeOperation = 'xor';
}

let i = 0;

for (let y = 0; y < overlay.rows; y++) {
for (let x = 0; x < overlay.columns; x++) {
if (overlay.pixelData[i++] > 0) {
layerContext.fillRect(x, y, 1, 1);
}
}
}
layerContext.restore();
context.drawImage(layerCanvas, 0, 0);
});

context.restore();
}

/**
* Draw an image to a given enabled element synchronously
Expand Down Expand Up @@ -56,6 +106,7 @@ export default function (enabledElement, invalidated) {
}

render(enabledElement, invalidated);
renderOverlays(enabledElement, image.overlays);
}

// Calculate how long it took to draw the image/layers
Expand Down