[solved] Implement a slider with specific ratings

hollana28

Hello,

I'd like to implement a slider that includes amounts for an Ultimatum Decision Making task.

Something similar to the one in a previous discussion: http://forum.cogsci.nl/index.php?p=/discussion/40/solved-implementing-a-slider/p1

But with specific amounts along the slider bar - please the rough example here.

Thanks in advance!

eduard

Hi,

First of all, you can also have look on this discussion:

• http://forum.cogsci.nl/index.php?p=/discussion/1415/open-slider-and-touch-screen/p1

together they should get you enough information to get started.

In order to have values along the scale you have to add folllowing features:

• divide the length of the scale into equal-sized parts, which serve as coordinates to draw your markers on

• assuming that in those discussions mentioned, mouse position and corresponding values are being recorded, you only have to create a piece of code that dynamically draws the value at a position above that scale that is fixed in the vertical dimension (y is constant), but variable in the horizontal one (x is changing).

The code could look like this:

# first problem

# coordinates of the entire scale
x1 = 100
y1 = 600
x2 = 900
y2 = 600

no_markers = 5

dist_between_markers = (x2-x1)/ float(no_markers)
marker_pos = []
# adding all values to a list
for i in range(no_markers):
    marker_pos.append(x1+i*dist_between_markers,y1)
    canvas.text("Value you want to present",x = x1+i*dist_between_markers,y = y1)

# second problem
# check earlier discussions for the code that implements the main part of 
# updating the current value of the scale

# Let the current position be [x,y] and the current value: value = <some_value>

# very simple

canvas.text(str(current_value),x= x, y= y)

# the important thing is that this piece of code is placed within a while loop, 
# so that it is  updated on every iteration

I hope this helps. Let me know if you need more pointers.

Good luck,

Eduard

hollana28

Hi Eduard,
Thanks a lot! It works great now