[list=1][*]Click the full-screen button at the lower right corner to use this applet.[/*][*]After modifying the parameters in the control panel, click any space in the graphics view to activate it. Input the functions to plot.[/*][*]Show and edit the axis labels and text labels if necessary.[/*][*]Set the margins required.[/*][*]Save the picture as PNG or SVG formats.[/*][/list]

[code]If(-2<x<8, -0.25(x-4)^2+16)[br]If((x-3)^2-1<=20, (x-3)^2-1)[br]If(-2<x<1, x+5, 1<x<4, 6, 4<x<8, 3x-6)[/code]

[code]If(0<=x<=720, cos(x deg))[/code]

This applet is modified from [url=https://www.geogebra.org/m/mVWXRtt9]an applet[/url] made by Anthony Or of GeoGebra Institute of Hong Kong.[br][br]gMath 互動數學教室[br][url=http://www.gmath.hk]http://www.gmath.hk[/url]