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Listing 7 . Beginning of the overridden LoadContent method of the Game1 class.
protected override void LoadContent() {
spriteBatch = new SpriteBatch(GraphicsDevice);//Create a sprite for the background image.
spiderWeb =new Sprite("spiderwebB",Content,random);
spiderWeb.Position = new Vector2(0f,0f); The last two statements in Listing 7 instantiate a new Sprite object and load it with an image of the spider web shown in Figure 1 .
The purpose of this sprite is to serve as a background image. Before adding the image of the spider web to the Content folder during the design phase, I used an external program to scale the image to the same size asthe game window established by the constructor in Listing 15 .
The code in Listing 7 positions the upper left corner of the sprite at the upper left corner of the game window so that it just fills the game window asshown in Figure 1 .
The code in Listing 8 instantiates all of the spider and ladybug Sprite objects and sets their properties.
Listing 8 . Instantiate the spider and ladybug Sprite objects.
//Instantiate all of the spiders and cause them to
// move from left to right, top to// bottom. Pass a reference to the same Random
// object to all of the sprites.for(int cnt = 0;cnt<numSpiders;cnt++) {
spiders.Add(new Sprite("blackWidowSpider",Content,random));
//Set the position of the current spider at a// random location within the game window.
spiders[cnt].Position = new Vector2(
(float)(windowWidth * random.NextDouble()),(float)(windowHeight * random.NextDouble()));
//Get a direction vector for the current spider.// Make both components positive to cause the
// vector to point down and to the right.spiders[cnt].Direction = DirectionVector((float)maxVectorLength,
(float)(maxVectorLength * random.NextDouble()),false,//xNeg
false);//yNeg//Notify the spider object of the size of the
// game window.spiders[cnt].WindowSize =new Point(windowWidth,windowHeight);
//Set the speed in moves per second for the// current spider to a random value between
// maxSpiderSpeed/2 and maxSpiderSpeed.spiders[cnt].Speed = maxSpiderSpeed / 2+ maxSpiderSpeed * random.NextDouble() / 2;
}//end for loop//Use the same process to instantiate all of the
// ladybugs and cause them to move from right to// left, bottom to top.
for(int cnt = 0;cnt<numLadybugs;cnt++) {
ladybugs.Add(new Sprite("ladybug",Content,random));
ladybugs[cnt].Position = new Vector2(
(float)(windowWidth * random.NextDouble()),(float)(windowHeight * random.NextDouble()));
ladybugs[cnt].Direction = DirectionVector(
(float)maxVectorLength,(float)(maxVectorLength * random.NextDouble()),
true,//xNegtrue);//yNeg
ladybugs[cnt].WindowSize =
new Point(windowWidth,windowHeight);ladybugs[cnt].Speed = maxLadybugSpeed / 2+ maxLadybugSpeed * random.NextDouble() / 2;
}//end for loop}//end LoadContent 
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