draw-triangle

wayland/wio-terminal-lcd/draw-triangle

Draw a triangle.
draw-triangle
@/draw-triangle
Draw a triangle.
DEV@/lcd-device
An LCD device.
X0number
Vertex #0 x coordinate.
Y0number
Vertex #0 y coordinate.
X1number
Vertex #1 x coordinate.
Y1number
Vertex #1 y coordinate.
X2number
Vertex #2 x coordinate.
Y2number
Vertex #2 y coordinate.
Colorxod/color/color
Color.
Fillboolean
True to fill triangle with colour, False to draw outline only.
UPDpulse
Update.
draw-triangle
Done
DEV
X0
Y0
X1
Y1
X2
Y2
Color
Fill
UPD
Donepulse
Pulse on completion.
To use the node in your project you should have the wayland/wio-terminal-lcd 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

node {
    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 `TFT_eSPI tft` class instance
        auto tft = getValue<input_DEV>(ctx);

        XColor color24 = getValue<input_Color>(ctx);
        uint16_t color16 = ((color24.r & 0xF8) << 8) | ((color24.g & 0xFC) << 3) | (color24.b >> 3);

        if (getValue<input_Fill>(ctx)) {
            tft -> fillTriangle(getValue<input_X0>(ctx),
                                getValue<input_Y0>(ctx),
                                getValue<input_X1>(ctx),
                                getValue<input_Y1>(ctx),
                                getValue<input_X2>(ctx),
                                getValue<input_Y2>(ctx),
                                color16);
        } else {
            tft -> drawTriangle(getValue<input_X0>(ctx),
                                getValue<input_Y0>(ctx),
                                getValue<input_X1>(ctx),
                                getValue<input_Y1>(ctx),
                                getValue<input_X2>(ctx),
                                getValue<input_Y2>(ctx),
                                color16);
        }

        emitValue<output_Done>(ctx, 1);
    }
}