GeoGebra Klaslokaal

# changing the appearance of a point

## Introduction

You can change the appearance of a point in a script. Following applets show how to change the size, the color or the style by clicking on a button or by moving a slider.

## How do you do this?

Create a point A, whose properties we will change by buttons or sliders.
• Size by button: Create a button with the script `SetPointSize(A,9)`to set its size to 9 on clicking.
• Size by slider: - Create a slider with name size with values from 1 to 9. - Rightclick on the slider to open its Properties and select the tab Scripting. - Type the command `SetPointSize(A,size)` to change the size of A when moving the slider.
• Color by button: Create a button with the script `SetColor(A, "Red")` tot set the color to red on clicking.
• Color by sliders: - Create sliders red, green and blue from `0` to 1 with increment `0`.1 - Open the Properties of the slider red and select the tab Scripting. - Type the command `SetColor(A,red, green, blue)` to change the color while moving the slider. - Do the same for the sliders green and blue. - Observe how you can create whatever color by while combinating the values of the sliders.
• Point style: - Create a slider style from `0` to 9 with increment 1. - Open the Properties of the sleder and select the tab Scripting. - Type the command `SetPointStyle(A, style)` to change the style of A when moving the slider.
• Button reset: Create a button with following script to reset the settings of A on clicking: ```SetPointSize(A,5) SetColor(A,"Blue") SetPointStyle(A,0)```