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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 | 1159x 1159x 1159x 1159x 1159x 4x 1159x 1159x 1159x 1159x 1159x 1159x 1159x 1159x 1159x 4x 1159x 1159x 4x 1159x 1159x 1159x 1159x 1159x | import { Transform } from './transform';
import {
CPUFallbackEnabledElement,
CPUFallbackTransform,
} from '../../../../types';
/**
* Calculate the transform for a Cornerstone enabled element
*
* @param enabledElement - The Cornerstone Enabled Element
* @param scale - The viewport scale
* @returns The current transform
*/
export default function (
enabledElement: CPUFallbackEnabledElement,
scale?: number
): CPUFallbackTransform {
const transform = new Transform();
Iif (!enabledElement.viewport.displayedArea) {
return transform;
}
// Move to center of canvas
transform.translate(
enabledElement.canvas.width / 2,
enabledElement.canvas.height / 2
);
// Apply the rotation before scaling for non square pixels
const angle = enabledElement.viewport.rotation;
if (angle !== 0) {
transform.rotate((angle * Math.PI) / 180);
}
// Apply the scale
let widthScale = enabledElement.viewport.scale;
let heightScale = enabledElement.viewport.scale;
const width =
enabledElement.viewport.displayedArea.brhc.x -
(enabledElement.viewport.displayedArea.tlhc.x - 1);
const height =
enabledElement.viewport.displayedArea.brhc.y -
(enabledElement.viewport.displayedArea.tlhc.y - 1);
Eif (enabledElement.viewport.displayedArea.presentationSizeMode === 'NONE') {
Iif (
enabledElement.image.rowPixelSpacing <
enabledElement.image.columnPixelSpacing
) {
widthScale *=
enabledElement.image.columnPixelSpacing /
enabledElement.image.rowPixelSpacing;
} else Iif (
enabledElement.image.columnPixelSpacing <
enabledElement.image.rowPixelSpacing
) {
heightScale *=
enabledElement.image.rowPixelSpacing /
enabledElement.image.columnPixelSpacing;
}
} else {
// These should be good for "TRUE SIZE" and "MAGNIFY"
widthScale = enabledElement.viewport.displayedArea.columnPixelSpacing;
heightScale = enabledElement.viewport.displayedArea.rowPixelSpacing;
if (
enabledElement.viewport.displayedArea.presentationSizeMode ===
'SCALE TO FIT'
) {
// Fit TRUE IMAGE image (width/height) to window
const verticalScale =
enabledElement.canvas.height / (height * heightScale);
const horizontalScale =
enabledElement.canvas.width / (width * widthScale);
// Apply new scale
widthScale = heightScale = Math.min(horizontalScale, verticalScale);
if (
enabledElement.viewport.displayedArea.rowPixelSpacing <
enabledElement.viewport.displayedArea.columnPixelSpacing
) {
widthScale *=
enabledElement.viewport.displayedArea.columnPixelSpacing /
enabledElement.viewport.displayedArea.rowPixelSpacing;
} else if (
enabledElement.viewport.displayedArea.columnPixelSpacing <
enabledElement.viewport.displayedArea.rowPixelSpacing
) {
heightScale *=
enabledElement.viewport.displayedArea.rowPixelSpacing /
enabledElement.viewport.displayedArea.columnPixelSpacing;
}
}
}
transform.scale(widthScale, heightScale);
// Unrotate to so we can translate unrotated
if (angle !== 0) {
transform.rotate((-angle * Math.PI) / 180);
}
// Apply the pan offset
transform.translate(
enabledElement.viewport.translation.x,
enabledElement.viewport.translation.y
);
// Rotate again so we can apply general scale
if (angle !== 0) {
transform.rotate((angle * Math.PI) / 180);
}
Iif (scale !== undefined) {
// Apply the font scale
transform.scale(scale, scale);
}
// Apply Flip if required
Iif (enabledElement.viewport.hflip) {
transform.scale(-1, 1);
}
Iif (enabledElement.viewport.vflip) {
transform.scale(1, -1);
}
// Move back from center of image
transform.translate(-width / 2, -height / 2);
return transform;
}
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