Function createGradientColorMap

createGradientColorMap(levelsToColorsMapping): ColorMap
Create a gradient color map. Colors corresponding to levels in the level range of the color map are linearly interpolated (including alpha) between entries.

The example shows a ColorMap with 3 levels and 3 colors. The levels are mapped to colors as follows (level -> color):
- ]-inf, 100] -> Black
- ]100,200[ -> Something between Black and Green (linearly interpolated)
- 200 -> Green
- ]200,300[ -> Something between Green and Blue (linearly interpolated)
- [300, +inf[ -> Blue
Parameters
- levelsToColorsMapping: {
  color: string;
  level: number;
  }[]
  An array containing {level, color} entries (object literals). Levels are treated as Numbers. Colors are RIA Colors. The first element is a level. Entries are expected to be sorted in ascending level order.
```
var gradientColorMap = ColorMap.createGradientColorMap([
  {level: 100, color: "rgba(0, 0, 0, 1.0)"},   //100 -> Black
  {level: 200, color: "rgba(0, 255, 0, 1.0)"}, //200 -> Green
  {level: 300, color: "rgba(0, 0, 255, 1.0)"}  //300 -> Blue
]);
```
Returns ColorMap