Buttons
Introduction
With the scripting commands of a button you can increase or decrease the value of a number or a slider. You can set te value of any number.
Following applets groups some examples. While clicking on the buttons different things happen:
- increase s1: the value of slider s1 is increased by 1, regardless the value of s1.
- decrease s2: the value of slider s2 is decreased by 1, regardless the value of s2.
- reset s3: the value of slider s3 is set back to
0. - move A: the x-coordinate of A is increased by 1, regardless the equation of f.
- reset A: the x-coordinate of A is set back to
0, regardless the equation of f.
How do you do this?
- sliders: Create: sliders s1, s2 and s3 from -5 to 5 with increment 1.
- buttons: Create:
- button with Caption increase s1 and scripting command OnClick
SetValue(s1,s1+1).- button with Caption decrease s2 and scripting command OnClickSetValue(s2,s2-1).- button with Caption reset s3 and scripting command OnClickSetValue(s3,0). - function: Create
f(x) = x - point: Create A = Point(f) and set the trace on.
- buttons: Create:
- button with Caption move A and scripting command OnClick
SetValue((x(A)+1,f(x(A)+1))).- button with Caption reset A and scripting commands OnClickSetValue(A,(0,f(0)))to set back the x-coordinate of A to0.ZoomIn(1)to remove the trace of A.