The Dcolramp
unit is a dialog form unit used in the EPA SWMM project to display and manage color ramp schemes. This form allows users to select a color scheme from a predefined set and view how it looks by dynamically updating the color of different shape components in the form.
Key Features:
-
Color Scheme Selection:
- The form provides a combo box (
ComboBox1
) where users can choose from a list of predefined color schemes such as 'Rainbow', 'Pastel', 'Red', 'Green', etc. - Each color scheme consists of multiple colors (up to 5, as defined in
MAXCOLOR
), which are applied to various shapes (Shape0
,Shape1
, etc.) on the form.
- The form provides a combo box (
-
Color Scheme Display:
- When a color scheme is selected, the shapes on the form (represented by
TShape
components likeShape0
,Shape1
, etc.) are updated with the colors from the selected scheme. - The color values for each scheme are stored in a 2D array
SchemeColors
, which contains predefined color sets for each scheme.
- When a color scheme is selected, the shapes on the form (represented by
-
User Interaction:
- The combo box (
ComboBox1
) allows users to select the desired color scheme. When a scheme is selected, theComboBox1Change
event is triggered, which calls theChangeColorScheme
method to update the shapes with the new colors. - The shapes (
Shape0
,Shape1
, etc.) display the colors for the selected scheme, and these colors are stored in theColors
array for further use.
- The combo box (
Constants:
MAXSCHEME
: The maximum index for available color schemes (10 in this case).MAXCOLOR
: The maximum number of colors in a single color scheme (5 in this case).Schemes
: A list of predefined color scheme names, such as 'Rainbow', 'Red', 'Green', etc.SchemeColors
: A 2D array containing the actual color values for each color scheme. Each scheme has 5 associated colors.
Main Methods:
-
FormCreate
:- This method is triggered when the form is created. It loads the predefined color scheme names into the combo box (
ComboBox1
) and sets the default color scheme to the first one (ItemIndex := 0
).
- This method is triggered when the form is created. It loads the predefined color scheme names into the combo box (
-
ComboBox1Change
:- This method is triggered when the user changes the selected item in the combo box. It calls
ChangeColorScheme
to update the shapes with the colors of the newly selected scheme.
- This method is triggered when the user changes the selected item in the combo box. It calls
-
ChangeColorScheme
:- This method updates the colors of the shapes (
Shape0
,Shape1
, etc.) based on the selected color scheme. The color values are fetched from theSchemeColors
array, and theBrush.Color
property of each shape is updated accordingly.
- This method updates the colors of the shapes (
Example Use Case:
- The user opens the dialog and sees a list of color schemes in the combo box (
ComboBox1
). - The user selects a color scheme (e.g., 'Rainbow') from the list.
- The shapes (
Shape0
,Shape1
, etc.) are automatically updated to display the colors from the selected scheme. - The user can use these colors to visually represent different variables, such as runoff or pollutant levels, on the map or other components.
Summary:
The Dcolramp
unit is a simple but effective part of the EPA SWMM project that provides users with an interface to choose and view different color schemes for graphical representations. By selecting a color scheme from the combo box, users can visually customize the appearance of the study area or results within the SWMM interface.
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