Dynamic Colors

In GeoGebra, you can change the color of objects using tab Color of the Properties Dialog. However, you can also have the color of an object change dynamically: Open the Properties Dialog for a certain object whose color you would like to change and click on tab Advanced. There you will find a section called Dynamic Colors with text boxes for the color components Red, Green, and Blue.

Note: In each of these text boxes, you can enter a function with range [0, 1].

Example:

• Create three slider a, b, and c with an interval from 0 to 1.
• Create a polygon whose color should be influenced by the slider values.
• Open the Properties Dialog for the polygon poly1 and enter the names of the three sliders into the text boxes for the color components.
• Close the Properties Dialog and change the values of the sliders in order to find out how each color component influences the resulting color of the polygon.

Note: You could also animate the sliders with different speeds in order to see the color of the polygon change automatically.

RGB / HSV / HSL