draw-circle

wayland/ssd1306-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@/ssd1306-oled-i2c-device
An SSD1306 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/ssd1306-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

struct State {
};

{{ GENERATED_CODE }}

void evaluate(Context ctx) {
    // The node responds only if there is an input pulse
    if (!isInputDirty<input_UPD>(ctx))
        return;

    // Get a pointer to the `Adafruit_SSD1306` class instance
    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);
}