Lab 02: Game Loop and Simple Coordinates

Complete the following worksheet in pairs.

Names:

Drawing 101

Using an online color picker, find the HTML color string that corresponds to red , e.g. (255, 0, 0)

In a RGBA color, what does each component represent?

Write a formula that converts from unsigned char color values (e.g. [0,255]) to float color values (e.g. [0,1]).

Draw the coordinate system that extends from (0,0) to (500,500) and have axes matching the coordinate system in C#'s System.Drawing API.
- Draw a circle with radius 50 at (100,400)
- Draw a rectangle with width 100 and height 200 at (250,250)

Game Loop

Consider the base code for assignment 2. Code is here. Suppose Game.cs looks like

using System;
using System.Drawing;
using System.Windows.Forms;

public class Game
{
   class Point {
      public float x;
      public float y;

      public Point(float a, float b)
      {
         x = a;
         y = b;
      }
      public void Update(float dt)
      {
         x += 100 * dt;
      }
   }
   Point _point = null;

   public void Setup()
   {
      _point = new Point(25, (float) (Window.height * 0.5));
   }

   public void Update(float dt)
   {
      _point.Update(dt);
   }

   public void Draw(Graphics g)
   {
      Brush brush = new SolidBrush(Color.Red);
      g.FillEllipse(brush, _point.x, _point.y, 100, 100);
   }

   public void MouseClick(MouseEventArgs mouse) { }
   public void KeyDown(KeyEventArgs key) { }
}

In one sentence, describe what this program does.

In the coordinate system below, draw the scene that is displayed.

coordinates

Write code to modify the above code so the shape moves from the bottom left to the bottom right.

Write psuedocode to display your name, class year, and game title in a box in the bottom corner. Add this feature to your homework due on Friday!

Write psuedocode to toggle the display of your credit box when the player presses the '+' key. Add this feature to your homework due on Friday!