4. How can make this?

5. Programming Language!

6. Code
• printf(“Hello World”);

7. Code
• DrawImage( img, x, y );

9. Important Logic
• Game loop
• Change screen
• Collision detection
• Status check

10. What is computer?
• Fast calculator

11. Game loop

12. Game loop
• It’s all of the game loop logic

13. Game loop

15. Game loop

16. Game loop

17. Game loop

18. Change screen

19. Change screen
• Simple code

20. Change screen

21. Change screen

22. Change screen

23. Change screen

24. Change screen

25. Change screen
• How can change screen?

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

27. Collision detection

28. Collision detection
• Why check collision?

29. Collision detection
• Computer don’t know anything
• Just have data

30. Collision detection
• Remember mathematics!

31. Collision detection
• Circle collision detection

32. Collision detection
• Rectangle collision detection

33. 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);
}

34. Collision detection
• How about button?

35. Collision detection
• But how about it?

36. Collision detection
• But how about it?

37. Status check

38. Status check
• Player is dead?

39. Status check
• I want to buy weapon!

40. Status check
• Do I have money?

41. Status check
• Drinking potion!

42. Status check
• Drinking potion!

43. What do you think about it?

44. Q n A