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Image Location on 128x64 GLD Display

 
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Micro_Guy



Joined: 06 Aug 2015
Posts: 10

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Image Location on 128x64 GLD Display
PostPosted: Wed Aug 19, 2015 11:17 pm     Reply with quote
Hi Guys,

Typically when we want to display an image onto a 128x64 GLCD the byte array size is 64X16. To save space, I have a small image byte array 22x3. I would like to know how I can control where on the 128X64 the image is displayed (how to display it in the top left corner/ top right corner/ middle of screen etc.) I'm using the CCS HDM64GS12.c and graphics.c libraries...

Below is the code which writes the byte array onto the GLCD.
Code:
 

void glcd_imagem(int8 imagem);

const int8 imagem_1[22][3] = {
0x01, 0xFC, 0x00,
0x03, 0x03, 0x00,
0x04, 0x01, 0x00,
0x08, 0x00, 0x80,
0x08, 0x00, 0x80,
0x08, 0x00, 0x00,
0x08, 0x10, 0x00,
0x09, 0xA4, 0x80,
0x09, 0x5C, 0x80,
0x04, 0x09, 0x80,
0x06, 0x01, 0x00,
0x02, 0x02, 0x00,
0x01, 0x42, 0x00,
0x01, 0x04, 0x00,
0x01, 0xFC, 0x00,
0x01, 0x04, 0x00,
0x01, 0xFC, 0x00,
0x01, 0xFC, 0x00,
0x00, 0xD8, 0x00,
0x00, 0x20, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00,
0x00, 0x00, 0x00
};


void glcd_imagem(int8 imagem){
   
   char i,j;
   signed char k;
   
      if(imagem==1){
      for( i = 0 ; i < 22 ; i++ ){
         for( j = 0 ; j < 3 ; j++){   
         for(k=100;k>-1;k--){     
         if( bit_test(imagem_1[i][j] ,100-k ))
         glcd_pixel( j*8+k,i, ON );
         }
       }
      }
   }
}



After playing with the code above I've discovered that by changing the 100 value, the image is shifted left or right. However, I do not understand why (help here is also greatly appreciated).

Can someone help explain what the the code is actually doing and how i can adjust the image up and down...


Thanks in Advance
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Aug 19, 2015 11:42 pm     Reply with quote
Add int8 parameters of x, y to your glcd_imagem() function declaration.
Then inside that function, modify your call to glcd_pixel() to this:
Code:
glcd_pixel( (j*8+k) +x, i +y , ON );

This modification adds the x, y offset from the origin to all pixel draws.
Micro_Guy



Joined: 06 Aug 2015
Posts: 10

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PostPosted: Wed Aug 19, 2015 11:59 pm     Reply with quote
Sucess!!!

Thanks PCM Programmer!!!

Do you think you could shine some insight as to what's going on with the following code.

Code:
   
if(imagem==1){
      for( i = 0 ; i < 64 ; i ++ ){
         for( j = 0 ; j < 16 ; j ++){   
         for(k=7;k>-1;k--){     
         if( bit_test(imagem_1[i][j] ,7-k ))
         glcd_pixel( j*8+k,i, ON );
         }
       }
      }
   }


I'm fairly new to programming and would like to better understand arrays and how they can be manipulated. I want to actually know what's going on instead of just manipulating code.


Thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Aug 20, 2015 12:13 am     Reply with quote
I don't know. I hoped you were going to explain it to me. Shocked Smile
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