how to clearRect or setColor on SSD1306 ??

[RoboDurden]

Sorry for another simple question :-/ Have found nothing in your nice https://codedocs.xyz/lexus2k/lcdgfx/index.html

I only want to clear a small region like a clearRect(0,0,32,16); to prevent the flickering of display.clear();. Or is there a way to set the color to black like display.setColor(RGB_COLOR8(0,0,0)); ?

My workaround: display.printFixed(x, y, " ");

Thanks again :-)

[lexus2k]

Hi

I only want to clear a small region like a clearRect(0,0,32,16); to prevent the flickering of display.clear();. Or is there a way to set the color to black like display.setColor(RGB_COLOR8(0,0,0)); ?

The way for you is to use fillRect() and setColor() methods.

Best regards

[RoboDurden]

Thank you, this indeed works:

      display.setColor(RGB_COLOR8(0,0,0));
      display.fillRect(x,y,x+32,y+16);

I had only tested this with no success:

      display.setColor(RGB_COLOR8(0,0,0));
      display.printFixed(x, y, s, STYLE_BOLD);

This however has an effect:

      display.setColor(RGB_COLOR8(0,0,0));
      display.invertColors();
      display.printFixed(x, y, s, STYLE_BOLD);

That setColor(0) makes invertColors having no effect.

setColor(255) enables it again:

  display.setColor(RGB_COLOR8(255,255,255));
  display.invertColors();    
  display.printFixed(x, y, s, STYLE_BOLD);

So what confuses me is that this has no effect:

    display.setColor(RGB_COLOR8(0,0,0));
   display.printFixed(x, y, s, STYLE_BOLD);

So for printFixed, the setColor function is rather a setBackgroundColor. Whereas for fillRect the setColor function is setting the paint color.

It is still nice because printing text will overwrite the area anyway (which i had not been aware of and therefore wanted a clearRect). So no need to set background and forground color but one call to invertColor will do it.

A bit confusing but i have no idea for you how to do it better :-)