draw-text
wayland/sh1107-oled-i2c/draw-text
Writes string to display buffer. To show content of display buffer on screen use node send-buffer-to-display.
draw-text
@/draw-text
Writes string to display buffer. To show content of display buffer on screen use node send-buffer-to-display.
DEV@/sh1107-oled-i2c-device
An SH1107 OLED device.
Xnumber
Cursor position x coordinate.
Ynumber
Cursor position y coordinate.
TEXTstring
Text string. Special characters can be specified using octal index. For example the degree symbol "°" (decimal code 248) can be specified using "\370".
SIZEbyte
Font size.
COLOURnumber
Colour of circle. Options:
0 = black;
1 = white;
2 = invert.
WRAPboolean
If TRUE text is wrapped.
UPDpulse
Update. Trigger write to display buffer.
DONEpulse
Pulses on completion.
C++ implementation
#pragma XOD evaluate_on_pin disable
#pragma XOD evaluate_on_pin enable input_UPD
node {
void evaluate(Context ctx) {
if (!isInputDirty<input_UPD>(ctx))
return;
auto display = getValue<input_DEV>(ctx);
auto cursor_x = getValue<input_X>(ctx);
auto cursor_y = getValue<input_Y>(ctx);
auto xString = getValue<input_TEXT>(ctx);
auto font_size = getValue<input_SIZE>(ctx);
auto colour = getValue<input_COLOUR>(ctx);
auto wrap = getValue<input_WRAP>(ctx);
int N=length(xString) + 1;
char cString[N];
for(int i=0;i<N;i++)
cString[i]=0;
dump(xString, cString);
// Use full 256 char 'Code Page 437' font
display->cp437(true);
display->setTextWrap(wrap);
display->setCursor(cursor_x, cursor_y);
display->setTextSize(font_size);
display->setTextColor(colour);
display->println(cString);
emitValue<output_DONE>(ctx, 1);
}
}