FAQ: Python in Pokitto

Pokitto Software
9

cool.

Anyone know if there are any drawing functions other than sprites? like rects, lines etc?

10

I believe the only primitives supported are filled rectangle.
(I feel like I’m copying at my exams right now… )

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11

Is it possible to detect whether a button is held down?

12

The button is held if there is “down” event , but not yet “up” event.

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13

Can we access the header pins from micropython? I’d like to use my own button routines (https://os.mbed.com/users/spinal/code/HelloWorld_buttontest/) if possible. I’m having a couple of button issues and I’m curious if this would solve them.

14

Sure, in the slide set there is an example, how to read a “line following” sensor. That is how you can read any digital pin.

Of course, works only on HW.

15

@Hanski could you please add this to the FAQ at begin of the thread?
Can you confirm other random methods (like randrange(star,stop) , randint(start,stop)) are not supported?

Also it seems like the seed is never updated. At least in the sim this code give me always the same result:

import urandom as random
print(random.getrandbits(8))
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16

hmmm, it looks like only pins brought out to the PEX header are usable, is this right? I need some of the internal pins…

_aPin = Pin(Pin.P1_9, Pin.IN)
_bPin = Pin(Pin.P1_4, Pin.IN)
_cPin = Pin(Pin.P1_10, Pin.IN)
_upPin = Pin(Pin.P1_13, Pin.IN)
_downPin = Pin(Pin.P1_3, Pin.IN)
_leftPin = Pin(Pin.P1_25, Pin.IN)
_rightPin = Pin(Pin.P1_7, Pin.IN)
17

Added to the FAQ. The getrandbits() is the only function for getting random numbers.

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18

I could probably add these.

19

I’d probably be the only one who uses them. If it’s more than a couple of seconds work don’t bother.

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20

How do you draw a rectangle on the screen? In fact where can you see which functions are available?

21

Here are the gaming API functions listed: [Wiki]uPyGame & umachine library reference (for Micro Python in Pokitto)

You can only draw a filled rectangle.

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22

Thanks. I had checked that list but somehow missed the fill function…

23

My solution is to use 2 images, 1 horizontal and 1 vertical line then just draw however many you need to the screen

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24

Images? There’s no ‘draw line’ function? Or is it a speed thing?

Hrm, I wonder if image rendering is faster or slower than bresenham’s line algorithm…

25

I know, I couldn’t find anything other than drawing images or filling rects, so I did what anyone else would do. I used images of short lines and drew as many as I needed to create a rect.

26

As already two people were requesting drawing primitives, I am curious what you are doing with the primitives? I almost never use them in games.

27

I wanted to draw some lines and mistakenly thought I could use the filled rectangle function.
I always assumed that just drawing lines would be “better” in terms of “performance” than having to store and draw a whole bitmap of which most pixels are transparent. I currently don’t really need the lines though.

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28

Particles, particles everywhere.
And lasers light beams.
Also debug hit box, 3d flat shaded triangles, landscapes.
If you are not a pixel artist primitives help a lot.

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