tests_dicom_gradSquarePixGenerator.js
// namespace
// eslint-disable-next-line no-var
var test = test || {};
/**
* GradSquarePixGenerator
* Generates pixel data as a small gradient square.
*
* @param {object} options The generator options.
* @class
*/
const GradSquarePixGenerator = function (options) {
const numberOfColumns = options.numberOfColumns;
const numberOfRows = options.numberOfRows;
const numberOfSamples = options.numberOfSamples;
const numberOfColourPlanes = options.numberOfColourPlanes;
const isRGB = options.photometricInterpretation === 'RGB';
const getFunc = isRGB ? getRGB : getValue;
// full grad square
const borderI = 0;
const borderJ = 0;
// ~centered grad square
// const borderI = Math.ceil(numberOfColumns * 0.25);
// const borderJ = Math.ceil(numberOfRows * 0.25);
const minI = borderI;
const minJ = borderJ;
const maxI = numberOfColumns - borderI;
const maxJ = numberOfRows - borderJ;
const maxK = maxI;
const inRange = function (i, j) {
return i >= minI && i <= maxI &&
j >= minJ && j <= maxJ;
};
const background = 0;
const max = 255;
let maxNoBounds = 1;
maxNoBounds = getValue(maxI, maxJ, maxK) / max;
this.generate = function (pixelBuffer, sliceNumber) {
// main loop
let offset = 0;
for (let c = 0; c < numberOfColourPlanes; ++c) {
for (let j = 0; j < numberOfRows; ++j) {
for (let i = 0; i < numberOfColumns; ++i) {
for (let s = 0; s < numberOfSamples; ++s) {
if (numberOfColourPlanes !== 1) {
pixelBuffer[offset] = getFunc(i, j, sliceNumber)[c];
} else {
pixelBuffer[offset] = getFunc(i, j, sliceNumber)[s];
}
++offset;
}
}
}
}
};
/**
* Get a simple value.
*
* @param {number} i The column index.
* @param {number} j The row index.
* @param {number} k The slice index.
* @returns {number[]} The grey value.
*/
function getValue(i, j, k) {
let value = background + k * 2;
if (inRange(i, j)) {
value += Math.round((i + j) * (max / maxNoBounds));
}
return [value];
}
/**
* Get RGB values.
*
* @param {number} i The column index.
* @param {number} j The row index.
* @param {number} k The slice index.
* @returns {number[]} The [R,G,B] values.
*/
function getRGB(i, j, k) {
let value = getValue(i, j, k);
if (value > 255) {
value = 200;
}
return [value, 0, 0];
}
};
test.pixelGenerators = test.pixelGenerators || {};
test.pixelGenerators.gradSquare = {
generator: GradSquarePixGenerator
};