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Edit Gradient Color Dialog Box
You can use the Edit Gradient Color dialog box to specify the gradient color you want to apply to markers or areas of a geographic map. This topic describes the options in the dialog box.
Designer displays the Edit Gradient Color dialog box when you select 
beside the Color By or Fill By text box after adding an aggregation object to the text box in the Display screen of the Create Geographic Map dialog box or Geographic Map Wizard dialog box.
Designer displays these options:
Gradient color drop-down list
This drop-down list contains the gradient colors you can apply to markers or areas of the geographic map. Select the gradient color you need.
Color bar
The bar displays the colors in the selected gradient. You can customize the starting color, middle color, and ending color of the gradient by selecting the corresponding triangle below the color bar to select a color from the color palette.
Reversed
Select to reverse the direction of the gradient.
Middle Value
Designer enables this option when the selected gradient has a middle color. When it is cleared by default, Designer maps the middle value between the start value and end value to the middle color. You can select it to customize the value you want to map to the middle color.
- Auto Expand Start/End Value
Designer displays this option when you set Middle Value to 0. Select it if you want to expand the start value and end value automatically. When you select this option, it means 0 is the separator of negative and positive values. Designer maps the negative and positive values of the maximum absolute value to the starting color and ending color, and 0 is always in the middle of the data range.
Color of Null Values
Specify the color for null values. To edit the color, select the color indicator and select a color from the color palette, or type the hexadecimal value of a color (for example, 0xff0000) in the text box.
Gradient By
This drop-down list contains the algorithms you can apply to colors of the gradient. Select the algorithm you want to use.
- Auto
Select to use the default algorithm according to the type of the gradient. For single color, Designer applies the RGB linear algorithm; for start-end color, Designer applies the HSL linear algorithm; for start-middle-end color, Designer applies the HSL linear algorithm separately between the start-middle color and middle-end color. - RGB
Select to use the RGB linear algorithm, which uses red, green, and blue as the algorithm parameters. - HSL
Select to use the HSL linear algorithm, which uses hue, saturation, and lightness as the algorithm parameters.
Opacity
Specify the opacity of the gradient.
OK
Select to apply your settings and close the dialog box.
Cancel
Select to close the dialog box without saving any changes.
Help
Select to view information about the dialog box.