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 halfCols = numberOfColumns * 0.5;
const halfRows = numberOfRows * 0.5;
const background = 0;
const maxNoBounds = (halfCols + halfCols / 2) * (halfRows + halfRows / 2);
let max = 100;
this.generate = function (pixelBuffer, sliceNumber) {
const getFunc = isRGB ? getRGB : getGrey;
// slice dependent max
max = 100 + sliceNumber * 100;
// 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)[c];
} else {
pixelBuffer[offset] = getFunc(i, j)[s];
}
++offset;
}
}
}
}
};
/**
* Get a grey value.
*
* @param {number} i The column index.
* @param {number} j The row index.
* @returns {Array} The grey value.
*/
function getGrey(i, j) {
let value = background;
const jc = Math.abs(j - halfRows);
const ic = Math.abs(i - halfCols);
if (jc < halfRows / 2 && ic < halfCols / 2) {
value += (i * j) * (max / maxNoBounds);
}
return [value];
}
/**
* Get RGB values.
*
* @param {number} i The column index.
* @param {number} j The row index.
* @returns {Array} The [R,G,B] values.
*/
function getRGB(i, j) {
let value = 0;
const jc = Math.abs(j - halfRows);
const ic = Math.abs(i - halfCols);
if (jc < halfRows / 2 && ic < halfCols / 2) {
value += (i * j) * (max / maxNoBounds);
}
if (value > 255) {
value = 200;
}
return [0, value, value];
}
};
test.pixelGenerators = test.pixelGenerators || {};
test.pixelGenerators.gradSquare = {
generator: GradSquarePixGenerator
};