Andrej Mitrovic wrote:
On Feb 17, 8:24 pm, John Posner <jjpos...@optimum.net> wrote:
On 2/17/2010 1:10 PM, Andrej Mitrovic wrote:
<snip>
However the values list might have an uneven number of items. I would
like to make it as evenly distributed as possible, e.g.:
values =-2, -1, 0]
frames =obj1, obj2, obj3, obj4, obj5, obj6, obj7, obj8]
frames[0].func(values[0]) # func.(values[-2])
frames[1].func(values[0]) # func.(values[-2])
frames[2].func(values[1]) # func.(values[-2])
frames[3].func(values[1]) # func.(values[-1])
frames[4].func(values[1]) # func.(values[-1])
frames[5].func(values[2]) # func.(values[-1])
frames[6].func(values[2]) # func.(values[0])
frames[7].func(values[2]) # func.(values[0])
I'll be even more specific. I have a Minimum and Maximum value that
the user enters. The frame.func() function is a "translate" function,
it basically moves a frame in the application in one direction or
another depending on the argument value. So frame[0].func(2) would
move the frame[0] 2 pixels to the right. So what I want is the
function to create a smooth transition of all the frames from the
Minimum to the Maximum value. If minimum was 0, and maximum was 10,
I'd want the first frame moved 0 pixels (it stays in place), the last
frame to move 10 pixels, and the frames between are gradually moved
from 1 pixels to 9 pixels relative from their positions.
Perhaps I'm just overcomplicating. I'll have a look at some drawing
apps and see how they've implemented drawing straight lines under an
angle, I guess that could be called a gradual change of values.
Thanks for all the suggestions everyone, I'll have a look at the rest
shortly.
I think you're overcomplicating. If you have 27 frames, and you want
frame 0 to move 0 pixels, and frame 27 to move 10 pixels, then you want
to move frame[i] by i*10/27. And since you do the multiply first, the
fact that Python 2.x division gives you integers isn't a problem.
There are fancier methods for drawing lines (bresenham for example), but
the main purpose of them is to to avoid multiply and divide, as well as
floats. But in Python, an integer multiply is just as fast as an add or
subtract, so there's no point.
DaveA
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