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hzeller / rpi-rgb-led-matrix

Controlling up to three chains of 64x64, 32x32, 16x32 or similar RGB LED displays using Raspberry Pi GPIO
GNU General Public License v2.0
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(Python) Background Manipulation #250

Closed Gariantroll closed 7 years ago

Gariantroll commented 7 years ago

I am trying to find out where I can manipulate the color of the background when the matrix running. I would like to set it to off or to black. Is there an API I can refer to for Python?

hzeller commented 7 years ago

You have control of the color of every pixel; SetPixel() will set the color. There is no additional thing needed to distinguish background/foreground - if you don't set a pixel at all, it is simply black.

(If you have inverse data lines, the display will show inverse colors, e.g. a white background, in which case you'd choose the -DINVERSE_RGB_DISPLAY_COLORS compile option.)

Gariantroll commented 7 years ago

Bro, you are superman of the matrix world.

Gariantroll commented 7 years ago

Quick Question, I am trying to find a way to use the textrun.py sample and make the background LEDs one color but the text another color. Can you point me in the right direction on this? I am guessing that after the Text prints I have to make every other background pixel soemthing else, but I am wondering how to approach this.

hzeller commented 7 years ago

The C++ library has a function for that: https://github.com/hzeller/rpi-rgb-led-matrix/blob/master/include/graphics.h#L76

The simplified Python interface has not, but it should be pretty straight forward for you to also wrap this function if you use Python.

Gariantroll commented 7 years ago

Hey hzeller,

I am having an issue as I came back to this project. I was trying to write the wrapper then I realised that the I must have something wrong since the default background color is supposed to be black, but instead it is beaming white. I think I have a data line issue as you have implied in a previous response, so since I tried to implement that compile option, but it is not recognising the -DINVERSE_RGB_DISPLAY_COLOR. Where am I supposed to use this option?

hzeller commented 7 years ago

You have to uncomment https://github.com/hzeller/rpi-rgb-led-matrix/blob/master/lib/Makefile#L39 then recompile the library and the Python wrapper.

Gariantroll commented 7 years ago

Just to be clear, is the Python Wrapper where I use make build-python PYTHON=$(which python3) sudo make install-python PYTHON=$(which python3)

or am I just typing "make" in the python directory

hzeller commented 7 years ago

yes. Essentially change the makefile, type make clean in the lib directory and then go through the steps needed for building the Python lib again.

Gariantroll commented 7 years ago

I have tried -DINVERSE_RGB_DISPLAY_COLOR commented out and active, but I am still getting the bright light background. I know I am missing something, but I am stumped for now. Any suggestions?

hzeller commented 7 years ago

Systematically rule out possible problems. Start with running the c++ demo program to verify that your display now shows the correct colors. Also verify with the led-image-viewer. Read the troubleshooting section of the Readme.

Gariantroll commented 7 years ago

Just an update: The other programs also have white backgrounds. I am going to continue with the trouble shooting section and give you an update on my findings.

Gariantroll commented 7 years ago

Okay, I finally got it to work. It seems that when I was not overwriting a file properly, so I used sudo and success came soon after. Thanks a bunch for your help. I will for sure buy one of your books. Thanks again!!!