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.
draw-circle
DEV
X
Y
R
COLOUR
FILL
UPD
DONE
DONEpulse
Pulses on completion.
To use the node in your project you should have the wayland/sh1107-oled-i2c library installed. Use the “File → Add Library” menu item in XOD IDE if you don’t have it yet. See Using libraries for more info.

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);
    }
}