How to print Float or Double

[David2]

Hi there,

i want to print Float and Double values? the cmd_number only shows Int.

Any idea?

thanks

[jamesbowman]

You can use sprintf() to convert it to a string then use GD.cmd_text(). The downside is that sprintf() is quite slow and large.

Or you can do the conversion yourself. To get a fixed 3-digit precision here the function 'plotfloat' draws each number in three parts:

• the integer part is drawn right-justified
• the decimal point
• then the 3-digit fractional part

static void plotfloat(int x, int y, float f)
{
 int font = 30;

 GD.cmd_number(x - 2, y, font, OPT_RIGHTX | OPT_SIGNED, int(f));
 GD.cmd_text(  x,     y, font, 0, ".");
 GD.cmd_number(x + 8, y, font, 3, int(1000 * abs(f)));
}

void loop()
{
 GD.ClearColorRGB(0x103000);
 GD.Clear();

 float f = 3.142;

 plotfloat(100,  50, 1.000);
 plotfloat(100, 100, 3.142);
 plotfloat(100, 150, -8);
 plotfloat(100, 200, -8.333);

 GD.swap();
}