Integral Design

The Display_T35 module and the DisplayModule.SimpleGraphics object can display various graphics.  This example draws ellipses and sets the colors and sizes of the ellipses according to the voltage a GHI Electonics Potentiometer module.  Just for fun it also matches the color of a GHIElectronics MulticolorLed to that of the ellipse that is drawn on the screen.

.NET Gadgeteer Simple Graphics Ellipses

On each Timer.Tick event the .NET Gadgeteer.Timer.TickEventHandler reads the potentiometer and resets the size and color of the ellipse on the display to match the color of the MulticolorLed.  Access the SimpleGraphics object from the Gadgeteer.Modules.DisplayModule.SimpleGraphics property.

    void timer_Tick(GT.Timer timer)
    {
        double doubPotVoltage = potentiometer.ReadPotentiometerVoltage();
        PotVoltage potVoltEnum = SetPotEnumAndLED(doubPotVoltage);

        display.SimpleGraphics.DisplayText("Potentiometer ~~~~~ Voltage ~~~~~ Setting",
                        Resources.GetFont(Resources.FontResources.NinaB), led.GetCurrentColor(), 10, 5);

        uint intCode = (uint)potVoltEnum;

        uint xRadius = 30 * intCode;
        uint yRadius = 20 * intCode;

        display.SimpleGraphics.DisplayEllipse(led.GetCurrentColor(), 160, 130, xRadius, yRadius);
    }

.NET Gadgeteer Simple Graphics Ellipses

Complete application code follows.

using System;
using Microsoft.SPOT;
using Microsoft.SPOT.Presentation;
using Microsoft.SPOT.Presentation.Controls;
using Microsoft.SPOT.Presentation.Media;

using GT = Gadgeteer;
using GTM = Gadgeteer.Modules;
using Gadgeteer.Modules.GHIElectronics;

namespace GadgeteerDisplayGraphicsEllipse
{
    public partial class Program
    {
        GT.Timer timer = new GT.Timer(500);

        void ProgramStarted()
        {
            // Do one-time tasks here
            timer.Tick += new GT.Timer.TickEventHandler(timer_Tick);
            button.ButtonPressed += new Button.ButtonEventHandler(button_ButtonPressed);
            Debug.Print("Program Started");
        }

        void button_ButtonPressed(Button sender, Button.ButtonState state)
        {
            if (button.IsLedOn)
                timer.Stop();
            else
            {
                display.SimpleGraphics.Clear();
                timer.Start();
            }

            button.ToggleLED();
        }

        void timer_Tick(GT.Timer timer)
        {
            double doubPotVoltage = potentiometer.ReadPotentiometerVoltage();
            PotVoltage potVoltEnum = SetPotEnumAndLED(doubPotVoltage);

            display.SimpleGraphics.DisplayText("Potentiometer ~~~~~ Voltage ~~~~~ Setting",
                            Resources.GetFont(Resources.FontResources.NinaB), led.GetCurrentColor(), 10, 5);

            uint intCode = (uint)potVoltEnum;

            uint xRadius = 30 * intCode;
            uint yRadius = 20 * intCode;

            display.SimpleGraphics.DisplayEllipse(led.GetCurrentColor(), 160, 130, xRadius, yRadius);
        }

        enum PotVoltage
        {
            one = 1,
            low,
            mid,
            high,
            top
        }

        private PotVoltage SetPotEnumAndLED(double voltage)
        {
            PotVoltage enumPot = PotVoltage.one;
            for (int i = 0; i < 5; i++)
            {
                if (voltage == 0.0)
                {
                    enumPot = PotVoltage.one;
                    led.TurnWhite();
                    break;
                }
                if (voltage < 1.0)
                {
                    enumPot = PotVoltage.low;
                    led.TurnGreen();
                    break;
                }
                if (voltage < 2.0)
                {
                    enumPot = PotVoltage.mid;
                    led.TurnBlue();
                    break;
                }
                if (voltage < 3.0)
                {
                    enumPot = PotVoltage.high;
                    led.TurnRed();
                    break;
                }

                led.BlinkRepeatedly(GT.Color.Yellow);
                enumPot = PotVoltage.top;
            }

            return enumPot;
        }
    }
}