draw-circle
wayland/sh1107-oled-i2c/draw-circle
Draw a circle. Writes data to display buffer. To show content of display buffer on screen use node send-buffer-to-display.
draw-circle
@/draw-circle
Draw a circle. Writes data 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
Centre-point x coordinate.
Ynumber
Centre-point y coordinate.
Rnumber
Radius of circle (pixels).
COLOURnumber
Colour of circle. Options:
0 = black;
1 = white;
2 = invert.
FILLboolean
TRUE to fill circle with colour, FALSE to draw outline only.
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 x = getValue<input_X>(ctx);
auto y = getValue<input_Y>(ctx);
auto radius = getValue<input_R>(ctx);
auto colour = getValue<input_COLOUR>(ctx);
auto fill = getValue<input_FILL>(ctx);
if (fill){
display->fillCircle(x, y, radius, colour);
}else{
display->drawCircle(x, y, radius, colour);
}
emitValue<output_DONE>(ctx, 1);
}
}