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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 | 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x 1x | import macro from 'vtk.js/Sources/macros';
import vtkPolyData from 'vtk.js/Sources/Common/DataModel/PolyData';
import vtkEdgeLocator from 'vtk.js/Sources/Common/DataModel/EdgeLocator';
import vtkCaseTable from './caseTable';
const { vtkErrorMacro, vtkDebugMacro } = macro;
// ----------------------------------------------------------------------------
// vtkImageMarchingSquares methods
// ----------------------------------------------------------------------------
function vtkImageMarchingSquares(publicAPI, model) {
/**
* Get the X,Y kernels based on the set slicing mode.
* @returns {[number, number]}
*/
function getKernels() {
let kernelX = 0; // default K slicing mode
let kernelY = 1;
if (model.slicingMode === 1) {
kernelX = 0;
kernelY = 2;
} else if (model.slicingMode === 0) {
kernelX = 1;
kernelY = 2;
}
return [kernelX, kernelY];
}
// Set our className
model.classHierarchy.push('vtkImageMarchingSquares');
/**
* Get the list of contour values.
* @returns {number[]}
*/
publicAPI.getContourValues = () => model.contourValues;
/**
* Set the list contour values.
* @param {number[]} cValues
*/
publicAPI.setContourValues = (cValues) => {
model.contourValues = cValues;
publicAPI.modified();
};
const ids = [];
const pixelScalars = [];
const pixelPts = [];
const edgeLocator = vtkEdgeLocator.newInstance();
/**
* Retrieve scalars and pixel coordinates.
* @param {Vector3} ijk origin of the pixel
* @param {Vector3} dims dimensions of the image
* @param {TypedArray} scalars list of scalar values
* @param {Vector3} increments IJK slice increments
* @param {number} kernelX index of the X element
* @param {number} kernelY index of the Y element
*/
publicAPI.getPixelScalars = (
ijk,
dims,
scalars,
increments,
kernelX,
kernelY
) => {
const [i, j, k] = ijk;
// First get the indices for the pixel
ids[0] = k * dims[1] * dims[0] + j * dims[0] + i; // i, j, k
ids[1] = ids[0] + increments[kernelX]; // i+1, j, k
ids[2] = ids[0] + increments[kernelY]; // i, j+1, k
ids[3] = ids[2] + increments[kernelX]; // i+1, j+1, k
// Now retrieve the scalars
for (let ii = 0; ii < 4; ++ii) {
pixelScalars[ii] = scalars[ids[ii]];
}
};
/**
* Retrieve pixel coordinates.
* @param {Vector3} ijk origin of the pixel
* @param {Vector3} origin origin of the image
* @param {Vector3} spacing spacing of the image
* @param {number} kernelX index of the X element
* @param {number} kernelY index of the Y element
*/
publicAPI.getPixelPoints = (ijk, origin, spacing, kernelX, kernelY) => {
const i = ijk[kernelX];
const j = ijk[kernelY];
// (i,i+1),(j,j+1),(k,k+1) - i varies fastest; then j; then k
pixelPts[0] = origin[kernelX] + i * spacing[kernelX]; // 0
pixelPts[1] = origin[kernelY] + j * spacing[kernelY];
pixelPts[2] = pixelPts[0] + spacing[kernelX]; // 1
pixelPts[3] = pixelPts[1];
pixelPts[4] = pixelPts[0]; // 2
pixelPts[5] = pixelPts[1] + spacing[kernelY];
pixelPts[6] = pixelPts[2]; // 3
pixelPts[7] = pixelPts[5];
};
/**
* Produce points and lines for the polydata.
* @param {number[]} cVal list of contour values
* @param {Vector3} ijk origin of the pixel
* @param {Vector3} dims dimensions of the image
* @param {Vector3} origin origin of the image
* @param {Vector3} spacing sapcing of the image
* @param {TypedArray} scalars list of scalar values
* @param {number[]} points list of points
* @param {number[]} lines list of lines
* @param {Vector3} increments IJK slice increments
* @param {number} kernelX index of the X element
* @param {number} kernelY index of the Y element
*/
publicAPI.produceLines = (
cVal,
ijk,
dims,
origin,
spacing,
scalars,
points,
lines,
increments,
kernelX,
kernelY
) => {
const k = ijk[model.slicingMode];
const CASE_MASK = [1, 2, 8, 4]; // case table is actually for quad
const xyz = [];
let pId;
publicAPI.getPixelScalars(ijk, dims, scalars, increments, kernelX, kernelY);
let index = 0;
for (let idx = 0; idx < 4; idx++) {
if (pixelScalars[idx] >= cVal) {
index |= CASE_MASK[idx]; // eslint-disable-line no-bitwise
}
}
const pixelLines = vtkCaseTable.getCase(index);
if (pixelLines[0] < 0) {
return; // don't get the pixel coordinates, nothing to do
}
publicAPI.getPixelPoints(ijk, origin, spacing, kernelX, kernelY);
const z = origin[model.slicingMode] + k * spacing[model.slicingMode];
for (let idx = 0; pixelLines[idx] >= 0; idx += 2) {
lines.push(2);
for (let eid = 0; eid < 2; eid++) {
const edgeVerts = vtkCaseTable.getEdge(pixelLines[idx + eid]);
pId = undefined;
if (model.mergePoints) {
pId = edgeLocator.isInsertedEdge(
ids[edgeVerts[0]],
ids[edgeVerts[1]]
)?.value;
}
if (pId === undefined) {
const t =
(cVal - pixelScalars[edgeVerts[0]]) /
(pixelScalars[edgeVerts[1]] - pixelScalars[edgeVerts[0]]);
const x0 = pixelPts.slice(edgeVerts[0] * 2, (edgeVerts[0] + 1) * 2);
const x1 = pixelPts.slice(edgeVerts[1] * 2, (edgeVerts[1] + 1) * 2);
xyz[kernelX] = x0[0] + t * (x1[0] - x0[0]);
xyz[kernelY] = x0[1] + t * (x1[1] - x0[1]);
xyz[model.slicingMode] = z;
pId = points.length / 3;
points.push(xyz[0], xyz[1], xyz[2]);
if (model.mergePoints) {
edgeLocator.insertEdge(ids[edgeVerts[0]], ids[edgeVerts[1]], pId);
}
}
lines.push(pId);
}
}
};
publicAPI.requestData = (inData, outData) => {
// implement requestData
const input = inData[0];
if (!input) {
vtkErrorMacro('Invalid or missing input');
return;
}
if (
model.slicingMode == null ||
model.slicingMode < 0 ||
model.slicingMode > 2
) {
vtkErrorMacro('Invalid or missing slicing mode');
return;
}
console.time('msquares');
// Retrieve output and volume data
const origin = input.getOrigin();
const spacing = input.getSpacing();
const dims = input.getDimensions();
const extent = input.getExtent();
const increments = input.computeIncrements(extent);
const scalars = input.getPointData().getScalars().getData();
const [kernelX, kernelY] = getKernels();
// Points - dynamic array
const points = [];
// Cells - dynamic array
const lines = [];
// Ensure slice is valid
let k = Math.round(model.slice);
if (k >= dims[model.slicingMode]) {
k = 0;
}
// Loop over all contour values, and then pixels, determine case and process
const ijk = [0, 0, 0];
ijk[model.slicingMode] = k;
for (let cv = 0; cv < model.contourValues.length; ++cv) {
for (let j = 0; j < dims[kernelY] - 1; ++j) {
ijk[kernelY] = j;
for (let i = 0; i < dims[kernelX] - 1; ++i) {
ijk[kernelX] = i;
publicAPI.produceLines(
model.contourValues[cv],
ijk,
dims,
origin,
spacing,
scalars,
points,
lines,
increments,
kernelX,
kernelY
);
}
}
edgeLocator.initialize();
}
// Update output
const polydata = vtkPolyData.newInstance();
polydata.getPoints().setData(new Float32Array(points), 3);
polydata.getLines().setData(new Uint32Array(lines));
outData[0] = polydata;
vtkDebugMacro('Produced output');
console.timeEnd('msquares');
};
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {
contourValues: [],
slicingMode: 2,
slice: 0,
mergePoints: false,
};
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);
// Make this a VTK object
macro.obj(publicAPI, model);
// Also make it an algorithm with one input and one output
macro.algo(publicAPI, model, 1, 1);
macro.setGet(publicAPI, model, ['slicingMode', 'slice', 'mergePoints']);
// Object specific methods
macro.algo(publicAPI, model, 1, 1);
vtkImageMarchingSquares(publicAPI, model);
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(extend, 'vtkImageMarchingSquares');
// ----------------------------------------------------------------------------
export default { newInstance, extend };
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