draw-line

wayland/wio-terminal-lcd/draw-line

Draw a line.
draw-line
@/draw-line
Draw a line.
DEV@/lcd-device
An LCD device.
X0number
X coordinate of the start of the line.
Y0number
Y coordinate of the start of the line.
X1number
X coordinate of the end of the line.
Y1number
Y coordinate of the end of the line.
Colorxod/color/color
Line color.
UPDpulse
Update.
draw-line
Done
DEV
X0
Y0
X1
Y1
Color
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);

        tft -> drawLine(getValue<input_X0>(ctx),
                        getValue<input_Y0>(ctx),
                        getValue<input_X1>(ctx),
                        getValue<input_Y1>(ctx),
                        color16);

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