Class Contour

Example

const colorFunc = (num: number) => {
   let colorStart = Cesium.Color.WHITE;
   let colorEnd = Cesium.Color.RED;
   if (0 < num && num <= 0.25) {
     colorStart = Cesium.Color.fromCssColorString('#0cf2f4');
     colorEnd = Cesium.Color.fromCssColorString('#77f40c');
   } else if (0.25 < num && num <= 0.5) {
     colorStart = Cesium.Color.fromCssColorString('#77f40c');
     colorEnd = Cesium.Color.fromCssColorString('#f4dc0c');
   } else if (0.5 < num && num <= 0.75) {
     colorStart = Cesium.Color.fromCssColorString('#f4dc0c');
     colorEnd = Cesium.Color.fromCssColorString('#f45a0c');
   } else if (0.75 < num && num <= 1) {
     colorStart = Cesium.Color.fromCssColorString('#f45a0c');
     colorEnd = Cesium.Color.fromCssColorString('#f00');
   }
   return Cesium.Color.lerp(colorStart, colorEnd, num, new Cesium.Color());
 };
 const analyser = new Contour(viewer.terrainProvider);
 analyser.analyse(positions, state.interval)
 .then(res => {
   const step = (analyser.maxHeight - analyser.minHeight) / 4;
   const minH = analyser.minHeight;
   analyser.visualize(res, 6, colorFunc).forEach(item => primitives.add(item));
 });
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