Integral Design

This example uses the GHI Electronics Display_T35 module, the Potentiometer, and a Button to demonstrate use of the Display Module Simple Graphics interface.  The application displays circles, or symmetrical ellipses, on an orange background based on the coordinates of a Window.TouchDown event. The size of the circle is determined by the potentiomenter setting.

    void window_TouchDown(object sender, Microsoft.SPOT.Input.TouchEventArgs e)
    {
        int x;
        int y;
        // Use the out parameters to get the position of touch.
        e.GetPosition(window, 0, out x, out y);

        double potSetting = potentiometer.ReadPotentiometerPercentage();
        // Multiply by 100 to get into integer range before conversion.
        display.SimpleGraphics.DisplayEllipse(GT.Color.Green, (uint)x, (uint)y,
                                   (uint)(potSetting * 100), (uint)(potSetting * 100));

    }

The Display_T35 touch screen displays circles where a touch occurs, as shown in the following illustration. To clear the display, push the button.

Display Simple Graphics

All the applicatoin code is in the Program.cs file as 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 GadgeteerDisplayGraphics
{
    public partial class Program
    {
        Window window;
        void ProgramStarted()
        {
            window = display.WPFWindow;
            display.SimpleGraphics.BackgroundColor = GT.Color.Orange;

            window.TouchDown += new Microsoft.SPOT.Input.TouchEventHandler(window_TouchDown);
            button.ButtonPressed += new Button.ButtonEventHandler(button_ButtonPressed);
            Debug.Print("Program Started");
        }

        void button_ButtonPressed(Button sender, Button.ButtonState state)
        {
            display.SimpleGraphics.Clear();
        }

        void window_TouchDown(object sender, Microsoft.SPOT.Input.TouchEventArgs e)
        {
            int x;
            int y;
            // Use the out parameters to get the position of touch.
            e.GetPosition(window, 0, out x, out y);

            double potSetting = potentiometer.ReadPotentiometerPercentage();
            // Multiply by 100 to get into integer range before conversion.
            display.SimpleGraphics.DisplayEllipse(GT.Color.Green, (uint)x, (uint)y,
                                     (uint)(potSetting * 100), (uint)(potSetting * 100));

        }
    }
}