Base class for color models that return a color from a data value using an interpolation between two extremum colors around a neutral value.
| Parameter | Type | Description |
|---|---|---|
| startColor | dojo/_base/Color | The start color. |
| endColor | dojo/_base/Color |
Optional The end color. |
See the dojox/color/NeutralColorModel reference documentation for more information.
| Parameter | Type | Description |
|---|---|---|
| from | undefined | |
| to | undefined | |
| value | undefined |
Return the neutral value. This can be for example the mean or average value. This function must be implemented by implementations.
| Parameter | Type | Description |
|---|---|---|
| min | Number | The minimal value. |
| max | Number | The maximum value. |
| sum | Number | The sum of all values. |
| values | Number[] | The sorted array of values used to compute colors. |
return the color for a given data value.
| Parameter | Type | Description |
|---|---|---|
| value | Number | The data value. |
Return the normalized (between 0 and 1) value for a given data value. This implementation uses an power function to map neutral value to 0.5 and distribute other values around it.
| Parameter | Type | Description |
|---|---|---|
| value | Number | The data value |
Initialize the color model from a list of data items and using a function that returns the value used to compute the color for a given item.
| Parameter | Type | Description |
|---|---|---|
| items | Object[] | The data items. |
| colorFunc | Function | The function that returns the value used to compute the color for particular data item. |