measureText and measureChar return negative or wrong sizes

[birdboat00]

[vindar]

Hi,

Could you provide me with a short example/code snippet so that I can check and try to fix it ?

[birdboat00]

const auto title_text = "Test";

fb.drawTextEx(title_text, tgx::iVec2(fb.lx() / 2, 16), font_tgx_OpenSans_12, tgx::CENTER,
    false, false, tgx::RGB565_Black);

This is actually all I do, everything like its supposed to be.

This is what it actually looks like

When i print the character sizes and the text size they are either negative or very small.

My framebuffer is RGB565 320x240

[birdboat00]

I can send you a more sophisticated setup but it turned into a bigger project that requires some setup.

[vindar]

Hi,

Just found some time to try your code but it seems to be working correctly for me...

I run the code below (using your example) but 'test' does appear correctly in the middle of the screen.

Can you try it or provide me with a complete example that I can run ?

// install from arduino's library manager or from https://github.com/vindar/ILI9341_T4
#include <ILI9341_T4.h> 

// the tgx library 
#include <tgx.h> 

#include "font_tgx_OpenSans.h"

// DEFAULT WIRING USING SPI 0 ON TEENSY 4/4.1
#define PIN_SCK     13      // mandatory
#define PIN_MISO    12      // mandatory
#define PIN_MOSI    11      // mandatory
#define PIN_DC      10      // mandatory, can be any pin but using pin 10 (or 36 or 37 on T4.1) provides greater performance
#define PIN_CS      9       // optional (but recommended), can be any pin.  
#define PIN_RESET   6       // optional (but recommended), can be any pin. 
#define PIN_BACKLIGHT 255   // optional, set this only if the screen LED pin is connected directly to the Teensy.
#define PIN_TOUCH_IRQ 255   // optional. set this only if the touchscreen is connected on the same SPI bus
#define PIN_TOUCH_CS  255   // optional. set this only if the touchscreen is connected on the same spi bus

#define SPI_SPEED       20000000

// the screen driver object
ILI9341_T4::ILI9341Driver tft(PIN_CS, PIN_DC, PIN_SCK, PIN_MOSI, PIN_MISO, PIN_RESET, PIN_TOUCH_CS, PIN_TOUCH_IRQ);

// screen dimension (landscape mode)
static const int SLX = 320;
static const int SLY = 240;

uint16_t fb[SLX * SLY]; // main screen framebuffer (150K in DTCM for fastest access)

tgx::Image<tgx::RGB565> im(fb, SLX, SLY); // image that encapsulates fb.

void setup()
    {    
    Serial.begin(9600); 
    tft.output(&Serial);
    while(!tft.begin(SPI_SPEED));
    pinMode(PIN_BACKLIGHT, OUTPUT);
    digitalWrite(PIN_BACKLIGHT, HIGH); // backlight   
    tft.setRotation(3); // portrait mode

    // test
    im.clear(tgx::RGB565_White);
    const auto title_text = "Test";
    im.drawTextEx(title_text, tgx::iVec2(im.lx() / 2, 16), font_tgx_OpenSans_12, tgx::CENTER, false, false, tgx::RGB565_Black);
    tft.update(fb);
    }

void loop()
    { 
    }