clamp static method

void clamp(Float32List g, TerrainOptions options)

Rescale the heightmap of a terrain to keep it within the maximum range.

Float32List g The geometry's z-positions to modify with heightmap data. TerrainOptions options A map of settings that control how the terrain is constructed and displayed. Valid values are the same as those for the options parameter of {@link THREE.Terrain}() but only maxHeight, minHeight, and easing are used.

Implementation

static void clamp(Float32List g, TerrainOptions options) {
    double min = double.infinity,
        max = -double.infinity;
    int l = g.length;

    options.easing = options.easing;
    for (int i = 0; i < l; i++) {
      if (g[i] < min) min = g[i];
      if (g[i] > max) max = g[i];
    }
    double actualRange = max - min,
      optMax = options.maxHeight ?? max,
      optMin = options.minHeight ?? min,
      targetMax = options.stretch ? optMax : (max < optMax ? max : optMax),
      targetMin = options.stretch ? optMin : (min > optMin ? min : optMin),
      range = targetMax - targetMin;
    if (targetMax < targetMin) {
        targetMax = optMax;
      range = targetMax - targetMin;
    }

    for (int i = 0; i < l; i++) {
      g[i] = options.easing.call((g[i] - min) / actualRange)*range + optMin;
    }
}