Colors in Ejs View Elements

A static color (i.e. a color that will not change during the execution of the simulation) for a given view element property is specified in Ejs using either one of the predefined Ejs colors:
  • black,
  • blue,
  • cyan,
  • darkGray,
  • gray,
  • green,
  • lightGray,
  • magenta,
  • orange,
  • pink,
  • red,
  • white,
  • yellow,
or providing its integer RGB coordinates (between 0 and 255), plus an optional transparency coordinate, as in 0,253,12,255. Just type the desired value in the corresponding view element property. A specialized color chooser can also help you choose a given static color.

To specify a color that changes in run-time, you'll need to declare a variable of type Object, associate it to the corresponding element property, and then change the variable according to your program's logic.

For instance, if you declare a variable in Ejs called myColor, of type Object, the lines:

  myColor = java.awt.Color.RED;
  myColor = new java.awt.Color(255,0,0);
can both be used in the Java code of your program to create a solid red color in run-time. The associated view element property will change accodingly.

If you need semi-transparent colors, use something like:

  myColor = new java.awt.Color(255,0,0,127);
The last parameter is the level of transparency desired. 255 makes a full solid color. Semi-transparent colors may slow down a little bit your program.