Press n or j to go to the next uncovered block, b, p or k for the previous block.
| 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 | 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 vtkDataArray from 'vtk.js/Sources/Common/Core/DataArray';
import vtkPolyData from 'vtk.js/Sources/Common/DataModel/PolyData';
import vtkCellArray from 'vtk.js/Sources/Common/Core/CellArray';
import DataAccessHelper from 'vtk.js/Sources/IO/Core/DataAccessHelper';
// Enable several sources for DataAccessHelper
import 'vtk.js/Sources/IO/Core/DataAccessHelper/LiteHttpDataAccessHelper'; // Just need HTTP
// import 'vtk.js/Sources/IO/Core/DataAccessHelper/HttpDataAccessHelper'; // HTTP + gz
// import 'vtk.js/Sources/IO/Core/DataAccessHelper/HtmlDataAccessHelper'; // html + base64 + zip
// import 'vtk.js/Sources/IO/Core/DataAccessHelper/JSZipDataAccessHelper'; // zip
// ----------------------------------------------------------------------------
// vtkElevationReader methods
// ----------------------------------------------------------------------------
function vtkElevationReader(publicAPI, model) {
// Set our className
model.classHierarchy.push('vtkElevationReader');
// Create default dataAccessHelper if not available
if (!model.dataAccessHelper) {
model.dataAccessHelper = DataAccessHelper.get('http');
}
// Internal method to fetch Array
function fetchCSV(url, options) {
return model.dataAccessHelper.fetchText(publicAPI, url, options);
}
// Set DataSet url
publicAPI.setUrl = (url, options) => {
model.url = url;
// Fetch metadata
return publicAPI.loadData(options);
};
// Fetch the actual data arrays
publicAPI.loadData = (options) =>
fetchCSV(model.url, options).then((csv) => {
publicAPI.parseAsText(csv);
return true;
});
publicAPI.parseAsText = (csv) => {
model.csv = csv;
model.elevation = [];
// Parse data
const lines = model.csv.split('\n');
lines.forEach((line, lineIdx) => {
model.elevation.push(line.split(',').map((str) => Number(str)));
});
publicAPI.modified();
};
publicAPI.requestData = (inData, outData) => {
const polydata = vtkPolyData.newInstance();
polydata.getPoints().setData(new Float32Array(0, 0, 0, 1, 1, 1), 3);
if (model.elevation) {
const jSize = model.elevation.length;
const iSize = model.elevation[0].length;
// Handle points and polys
const points = polydata.getPoints();
points.setNumberOfPoints(iSize * jSize, 3);
const pointValues = points.getData();
const polys = vtkCellArray.newInstance({
size: 5 * (iSize - 1) * (jSize - 1),
});
polydata.setPolys(polys);
const polysValues = polys.getData();
let cellOffset = 0;
// Texture coords
const tcData = new Float32Array(iSize * jSize * 2);
const tcoords = vtkDataArray.newInstance({
numberOfComponents: 2,
values: tcData,
name: 'TextureCoordinates',
});
polydata.getPointData().setTCoords(tcoords);
for (let j = 0; j < jSize; j++) {
for (let i = 0; i < iSize; i++) {
const offsetIdx = j * iSize + i;
const offsetPt = 3 * offsetIdx;
// Fill points coordinates
pointValues[offsetPt + 0] =
model.origin[0] + i * model.xSpacing * model.xDirection;
pointValues[offsetPt + 1] =
model.origin[1] + j * model.ySpacing * model.yDirection;
pointValues[offsetPt + 2] =
model.origin[2] + model.elevation[j][i] * model.zScaling;
// fill in tcoords
tcData[offsetIdx * 2] = i / (iSize - 1.0);
tcData[offsetIdx * 2 + 1] = 1.0 - j / (jSize - 1.0);
// Fill polys
if (i > 0 && j > 0) {
polysValues[cellOffset++] = 4;
polysValues[cellOffset++] = offsetIdx;
polysValues[cellOffset++] = offsetIdx - 1;
polysValues[cellOffset++] = offsetIdx - 1 - iSize;
polysValues[cellOffset++] = offsetIdx - iSize;
}
}
}
}
model.output[0] = polydata;
};
// return Busy state
publicAPI.isBusy = () => !!model.requestCount;
}
// ----------------------------------------------------------------------------
// Object factory
// ----------------------------------------------------------------------------
const DEFAULT_VALUES = {
origin: [0, 0, 0],
xSpacing: 1,
ySpacing: 1,
zScaling: 1,
xDirection: 1,
yDirection: -1,
requestCount: 0,
// dataAccessHelper: null,
// url: null,
};
// ----------------------------------------------------------------------------
export function extend(publicAPI, model, initialValues = {}) {
Object.assign(model, DEFAULT_VALUES, initialValues);
// Build VTK API
macro.obj(publicAPI, model);
macro.get(publicAPI, model, ['url']);
macro.setGet(publicAPI, model, [
'dataAccessHelper',
'xSpacing',
'ySpacing',
'zScaling',
'xDirection',
'yDirection',
]);
macro.algo(publicAPI, model, 0, 1);
macro.event(publicAPI, model, 'busy');
// Object methods
vtkElevationReader(publicAPI, model);
}
// ----------------------------------------------------------------------------
export const newInstance = macro.newInstance(extend, 'vtkElevationReader');
// ----------------------------------------------------------------------------
export default { newInstance, extend };
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