Smartmatrix - gif - position on the display

toeoe · August 25, 2021, 4:02pm

Hello,

the library is great, but I found no answer to my question.

The example “AnimatedGifs” works great with 32x32 pixel gifs. I have two 64x64 panels.
Can i specify, where the gif should be played on the display? By default, the gif is always played in the top left corner.

Thank you so much for help.

Best regards
Thomas

easone · August 25, 2021, 4:20pm

Looking at the AnimatedGIFs example, It looks like you can modify drawPixelCallback to add offsets to x and y. You could use global variables for the offsets if you wanted to change the position dynamically. Haven’t tried it but it should work…

toeoe · August 25, 2021, 6:37pm

Thank you very much. It works.

You only have to adjust the coordinates in this line in the function.

void drawPixelCallback(int16_t x, int16_t y, uint8_t red, uint8_t green, uint8_t blue) {
   #if (USE_SMARTMATRIX == 1)
       backgroundLayer.drawPixel(x+64, y, {red, green, blue});
   #endif
}

marcmerlin · August 26, 2021, 12:26pm

My fork of the lib supports offsets and shrinking/zooming into gifs (for instance to display a 32x32 on a 24x32 display)

github.com

marcmerlin/AnimatedGIFs/blob/master/SimpleGifAnimViewer/SimpleGifAnimViewer.ino#L7


      
          #define NEOPIXEL_MATRIX
          #include "neomatrix_config.h"
          #include "GifDecoder.h"
          
          
// If the matrix is a different size than the GIFs, allow panning through the GIF
          // while displaying it, or bouncing it around if it's smaller than the display
          int OFFSETX = 0;
          int OFFSETY = 0;
          int FACTX = 0;
          int FACTY = 0;
          
          

          
#if defined(ARDUINOONPC)
              //const char *pathname = FS_PREFIX "/gifs128x192/Aki5PC6_Running.gif";
              const char *pathname = FS_PREFIX "/gifs128x192/abstract_colorful.gif";
          #elif defined(ESP8266)
              // 32x32 GIFs on 24x32 display, hence offset of -4

Same lib, just with a few improvements like this one

marcmerlin · August 26, 2021, 12:29pm

github.com

marcmerlin/AnimatedGIFs/blob/179a2d6593f073beb29cbaf9bffe06a3f91b95ab/GifAnim_Impl.h#L146


      
                Serial.print(green);
                Serial.print(",");
                Serial.print(blue);
                Serial.println("");
            }
            if (y > DEBUGLINE) return;
          #endif
          #ifdef NEOMATRIX
            CRGB color = CRGB(red, green, blue);
          
          
  uint16_t basex = x*FACTX/10+OFFSETX;
            uint16_t basey = y*FACTY/10+OFFSETY;
          
          
  matrix->drawPixel(basex, basey, color);
          
          
  if (FACTX > 10 && FACTY > 10) {
                matrix->drawPixel(basex+1, basey,   color);
                matrix->drawPixel(basex,   basey+1, color);
                matrix->drawPixel(basex+1, basey+1, color);
            } else if (FACTY > 10) {
                matrix->drawPixel(basex,   basey+1, color);