| title | date | tags | author | author_url | summary | related_funcs | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
How to make a game with C# and SplashKit |
2019-09-20 10:12 AEST |
graphics, color, audio, window |
Nguyen Anh Tu |
This guide discusses how you can make a simple game with C# and SplashKit.
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The Sky Attack game will have a player, represented by a group of shapes on the screen, that can move UP, DOWN, LEFT and RIGHT.
When run, the user will control the player. They can use the arrow keys to move the player around on the screen and use Space key to shoot bullets to destroy the flies that appear from the top of the screen. Each time the player is hit by a robot, the fly will disappear, and the player will lose one life. The player will start with 10 lives, so the game is over when they have been hit by ten Flies.
The Player class contains Draw(), HandleInput() and StayOnWindow(). The Draw() method will draw the shape of the player. The HandleInput() method will check if any of the arrow keys are held down, and will move the player by changing its X and Y location in response to these events. The StayOnWindow() method will keep the Player on the screen.
- Draw() method
double leftX = X + 40;
double rightX = X + 80;
_gameWindow.FillRectangle(Color.Red, leftX, Y+30, 40, 30);
_gameWindow.FillRectangle(Color.Black, leftX-20, Y+30+30/4, 20, 15);
_gameWindow.FillRectangle(Color.Black, rightX, Y+30+30/4, 20, 15);
_gameWindow.FillTriangle(Color.Red, X, Y+60, X+20, Y, X+20, Y+80);
_gameWindow.FillTriangle(Color.Red, X+120, Y+60, X+100, Y, X+100, Y+80);
_gameWindow.FillTriangle(Color.Black, X+50, Y+30, X+70, Y+30, X+60, Y+15);
_gameWindow.FillTriangle(Color.Black, X+50, Y+60, X+70, Y+60, X+60, Y+120);- Collision Circle for Player
public Circle PlayerCircle{
get { return SplashKit.CircleAt(X + Width / 2, Y + Height / 2, 60); }
}We create a Fly class which is an abstract class and this class will have three child classes.
- FlyOne
double leftX = X + 20;
double rightX = X + 60;
SplashKit.FillRectangle(BodyColor, leftX, Y+40, 40, 20);
SplashKit.FillTriangle(WingColor, X, Y+40, X+20, Y+80, X+20, Y+20);
SplashKit.FillTriangle(WingColor, rightX+20, Y+40, rightX, Y+80, rightX, Y+20);
SplashKit.FillCircle(CirColor, X+40, Y+50, 4);
SplashKit.FillTriangle(Color.Blue, leftX+10, Y+60, leftX+30, Y+60, leftX+20, Y+80);
SplashKit.FillTriangle(HeadColor, leftX+10, Y+60, leftX+30, Y+60, leftX+20, Y);
SplashKit.FillCircle(CirColor, leftX-10, Y+40, 4);
SplashKit.FillCircle(CirColor, rightX+10, Y+40, 4);- FlyTwo
double leftX = X + 20;
double rightX = X + 60;
SplashKit.FillEllipse(BodyColor, leftX, Y+40, 40, 20);
SplashKit.FillEllipse(WingColor, X, Y+20, 20, 60);
SplashKit.FillEllipse(WingColor, rightX, Y+20, 20, 60);
SplashKit.FillCircle(CirColor, X+40, Y+50, 4);
SplashKit.FillEllipse(Color.Red, leftX+10, Y+60, 20, 25);
SplashKit.FillTriangle(HeadColor, leftX+10, Y+60, leftX+30, Y+60, leftX+20, Y);
SplashKit.FillCircle(CirColor, leftX-10, Y+40, 4);
SplashKit.FillCircle(CirColor, rightX+10, Y+40, 4);- Collision Circle for Fly
public Circle FlyCircle{
get { return SplashKit.CircleAt(X + Width / 2, Y + Height / 2, 40); }
}Bullet class is an abstract class as well and it will have two child classes include SingleBullet and DoubleBullet class.
- Single Bullet
SplashKit.FillTriangle(Color.Red, X-5, Y,X + 5, Y, X, Y-10);- Double Bullet
SplashKit.FillTriangle(Color.Red, X-35, Y, X - 25, Y, X-30, Y-10);
SplashKit.FillTriangle(Color.Red, X+35, Y, X + 45, Y, X+40, Y-10);- Collision Circle for Bullet
Single Bullet
public Circle SingleBulletCircle{
get { return SplashKit.CircleAt(X, Y, 5); }
}Double Bullet
public Circle DoubleBulletCircleLeft{
get { return SplashKit.CircleAt(X-40, Y, 5); }
}
public Circle DoubleBulletCircleRight{
get { return SplashKit.CircleAt(X+40, Y, 5); }
}The SkyAttack class will be used to create an object that plays the role of the game itself. It will keep track of the player, the flies, and the bullets. It will need access to the SplashKitSDK namespace.
We need to check when the player collides with the fly or the bullet collides with the fly, we create a new fly.
- Player
public bool CollidedWith(Fly other){
return SplashKit.CirclesIntersect(PlayerCircle, other.FlyCircle);
}- Single Bullet
public override bool CollideWith (Fly other){
return SplashKit.CirclesIntersect(SingleBulletCircle, other.FlyCircle);
}- Double Bullet
public override bool CollideWith (Fly other){
return SplashKit.CirclesIntersect(DoubleBulletCircleLeft, other.FlyCircle) || SplashKit.CirclesIntersect(DoubleBulletCircleRight, other.FlyCircle) ;
}