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Gauge

The gauge element displays a handle inside a circular dial.

Configure

Ensure the graphics library is included and initialised according to the configuration procedure.

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myGauge.dDefine(x / 2, y / 2, dz, // x0 y0 radius
    0, 255, 1, // valueMin valueMax unit
    8, // grid
    myColours.white); // value colour
); // max colour

The required parameters are

  • The first line sets the x-y coordinates of the centre and the radius of the dial;

  • The second line sets the minimum, maximum and unit for the values.

The optional parameters are

  • The third line sets the number of divisions on the dial, default is 0;

  • The fourth line specifies the colour for the value.

Note

For monochrome and colour e-paper screens, ensure the selected colours are supported.

Use

myGauge.draw(value);

draw() sends the new value.

Optionally,

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myClock.draw(value,
    "text");
  • The optional second line contains the text displayed close to the bottom on the dial.

Example

This is the core of the code from example Graphics_Gauge.ino.

void displayGauge()
{
    myScreen.setOrientation(myOrientation);
    myScreen.clear();

    uint16_t x, y, dx, dy;
    int32_t value = 128;

    x = myScreen.screenSizeX();
    y = myScreen.screenSizeY();
    dx = x / 5;
    dy = y / 5;

    myScreen.selectFont(fontMedium);
    myScreen.gText(0, 0, "Gauge");

    gGauge myGauge;
    uint16_t dz = min(x, y) / 2 - 20;
    myGauge.dDefine(x / 2, y / 2, dz, // x0 y0 radius
                    0, 255, 1, // valueMin valueMax unit
                    0, 8, // memory grid
                    myColours.black, // back colour
                    myColours.white, // front colour
                    myColours.grey, // grid colour
                    myColours.white, // value colour
                    myColours.grey, // min colour
                    myColours.grey); // max colour

    myScreen.flushFast();

    for (uint16_t count = 127; count > 0; count--)
    {
        value = cos32x100(count * 200);

        myScreen.beginPartial();
        myGauge.draw(value);
        myScreen.flushPartial();
    }
}
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