How can make this?

Programming Language!

Code

• printf(“Hello World”);

Code

• DrawImage( img, x, y );

Important Logic

• Game loop• Change screen• Collision detection• Status check

What is computer?

• Fast calculator

Game loop

Game loop

• It’s all of the game loop logic

Game loop

Game loop

Game loop

Game loop

Change screen

Change screen

• Simple code

Change screen

Change screen

Change screen

Change screen

Change screen

Change screen

• How can change screen?

Notice!

• Do not write code like this.• This code is not stable.• Just for showing example.

Collision detection

Collision detection

• Why check collision?

Collision detection

• Computer don’t know anything• Just have data

Collision detection

• Remember mathematics!

Collision detection

• Circle collision detection

Collision detection

• Rectangle collision detection

Collision detection

• Rectangle collision detection

boolean rectangle_collision(float x_1, float y_1, float width_1, float height_1, float x_2, float y_2, float width_2, float height_2)

{return !(x_1 > x_2+width_2 || x_1+width_1 < x_2 ||

y_1 > y_2+height_2 || y_1+height_1 < y_2);}

Collision detection

• How about button?

Collision detection

• But how about it?

Collision detection

• But how about it?

Status check

Status check

• Player is dead?

Status check

• I want to buy weapon!

Status check

• Do I have money?

Status check

• Drinking potion!

Status check

• Drinking potion!

What do you think about it?

Q n A