About draw JPG multi images

Projects Programming
1

Hi all.
The example Due_SD_Jpeg from JPEGDecoder.h works well to show JPG image one by one.
My question is can it show 2 or even 4 images together? how to do it?

Thanks
Adam

/*
  This sketch is based on the sdFatTftBitmap example sketch from the ILI9341_due library.

  See: http://marekburiak.github.io/ILI9341_due/
  
  Adapted by Bodmer 20th January 2017 to incorporate the JPEGDecoder library and draw
  Jpeg images that have been stored on an SD card.

  It is compatible with the Mega and Due boards, modify the defined CS, DC pins
  for the TFT and SD connections to suit your setup.

  You can generate your own Jpeg images from digital photographs by cropping and resizing
  by using commonly available picture/image editors such as Paint or IrfanView.
  The example image used by the sketch is in the extras folder in the JPEGDecoder library,
  copy the "arduino.jpg" file to the SD card.

  See: https://github.com/Bodmer/JPEGDecoder

  The Arduino IDE's built in SD library is used:

  https://www.arduino.cc/en/reference/SD
*/

//  IMPORTANT: Edit the ILI9341_due_config.h to select:
//    #define ILI9341_SPI_MODE_NORMAL  // uses SPI library
//  this sketch will not work if the Due DMA or SPI extended mode is enabled.
//  Use the hardware SPI lines MOSI, MISO and SCK to interface with both the TFT and
//  the SD card.

//====================================================================================
//  libraries
//====================================================================================

#include <SPI.h>
#include <SD.h>  // Use the Arduino IDE built-in SD library
  
#include <ILI9341_due_config.h>
#include <ILI9341_due.h>

#include <JPEGDecoder.h>  // JPEG decoder library


//====================================================================================
//  defines
//====================================================================================

#define TFT_RST 8	// Reset for TFT
#define TFT_DC 9	// Command/Data for TFT
#define TFT_CS 10	// Chip Select for TFT

#define SD_CS 4		// Chip Select for SD card

#define TFT_BLACK 0x0000
#define TFT_WHITE 0xFFFF

//====================================================================================
//  setup
//====================================================================================

ILI9341_due tft = ILI9341_due(TFT_CS, TFT_DC, TFT_RST);

void setup()
{
  Serial.begin(9600);

  // Make sure the SD card chip select is high before we initialise the TFT
  pinMode(SD_CS, OUTPUT);
  digitalWrite(SD_CS, HIGH);

  // Initialise the TFT
  tft.begin();
  tft.fillScreen(TFT_BLACK);

  Serial.print(F("Initialising SD card..."));

  if (!SD.begin(SD_CS)){
    Serial.println(F("failed!"));
    return;
  }
  Serial.println(F("OK!"));
}


//====================================================================================
//  loop
//====================================================================================

void loop()
{
  tft.setRotation((iliRotation)0); // Landscape orientation

  // draw Arduino logo at a random position
  drawJpeg( "arduino.jpg", random(tft.width() - 160), random(tft.height() - 128) );
 
  delay(2000);

  tft.fillScreen(random(0xFFFF));
}
2

This line does the drawing and you have to set the XY-position where it shall be drawn.

If you want multiple picture you have to change the position for each jpeg in that way that the second picture's "start-point" is 1 pixel next to the endüpoint of first jpeg

1 Like
3

Great!
Thank you StefanL38.

tested with start point (x00, y00), the x00 can be positive or negative, but y00 only work when positive, nothing draw out if set y00<0, why?
is the y0 limit some where? or TFT regulated?

  x00 = -100;
  y00 = -100;

  drawSdJpeg( "/arduino.jpg", x00, y00 );
4

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