Programmin games - A 10 minute crash course

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This document provides an overview of programming games in 3 sentences or less: The document discusses the basic components of programming games, including reading user input, updating the game world, drawing the game world in a loop, drawing pixels to the screen, animations with sprites, updating positions and velocities, hit detection with boxes, and distance calculations. It also recommends the Gosu library for Ruby and provides tutorials and image credits.

Technology Business

Programming Games
The 10 minute crash course
Rails Girls The Hague 2013

Name: Patrick Huesler
Email: patrick.huesler@wooga.com
Github: phuesler
Twitter: phuesler

Read User Input
Update Game World
Draw Game World
Game Loop

Frame rate (FPS)
~60 frames per second
~30 frames per second

x
y
0,0
frames
frame 1 frame 2 frame 3 frame 4 frame 5

x
y
0,0
P(10,5)
x = 10
y = 5
Computer graphics

X
Y
0,0
Falling
vy : vertical velocity
vy > 0
ground
y = y + vy
vy

X
Y
0,0
Jumping
vy : vertical velocity
vy < 0
ground
y = y + vy
vy

x
y
0,0
Hit Detection
Hit Boxes:
Are the
rectangles
overlapping?
5,10
15,5
width
height
https://en.wikipedia.org/wiki/Hit-testing

x
y
0,0
Center
xc = x + height / 2
yc = y + widht / 2
xc = 5 + 11 / 2 = 8
yc = 5 + 11 / 2 = 8
center = p(8, 8)
5,5
width = 11
height=11c

x
y
0,0
Distance
https://en.wikipedia.org/wiki/Pythagorean_theorem
cTrollX - cRacoonX
cTrollY-cRacoonY
distance = sqrt(a^2 + b^2)
distance
a
b

https://github.com/jlnr/gosu/wiki/Window-Main-Loop

RG Tutorial*
https://github.com/FloorD/gosu_tutorial_RG_TH
*work in progress

Images
http://www.ﬂickr.com/photos/71753457@N00/2490975442/ orangeacid
http://www.ﬂickr.com/photos/83542829@N00/2778794704/ William Hook
http://www.ﬂickr.com/photos/60648084@N00/2462966749/ Ѕolo
http://www.ﬂickr.com/photos/34196372@N04/5906065484/ Keith Bloomﬁeld
http://www.ﬂickr.com/photos/99652207@N00/421447321/ Charles Williams
http://www.ﬂickr.com/photos/97223988@N00/6432357463 Flооd
http://www.ﬂickr.com/photos/45145879@N00/47714548/" 4tik
http://www.ﬂickr.com/photos/89455291@N00/4402938286 Fr3d.org
http://www.ﬂickr.com/photos/14443853@N07/5362778675 superUbO
http://www.ﬂickr.com/photos/26291754@N02/3720812250 Jen Son
http://www.ﬂickr.com/photos/14384226@N07/4768786395 Matteo Sorba

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Programmin games - A 10 minute crash course

1. Programming Games The 10 minute crash course Rails Girls The Hague 2013

2. Name: Patrick Huesler Email: patrick.huesler@wooga.com Github: phuesler Twitter: phuesler

4. Read User Input Update Game World Draw Game World Game Loop

5. Drawing

8. Pixel

10. GPU

11. Frame rate (FPS) ~60 frames per second ~30 frames per second

12. x y 0,0 frames frame 1 frame 2 frame 3 frame 4 frame 5

13. Animations

14. Sprites

15.

16. x y 0,0 P(10, 5) x = 10 y = 5 School

17. x y 0,0 P(10,5) x = 10 y = 5 Computer graphics

18. x y 0,0 width height

19. Update Game World

20. X Y 0,0 Movement -y +y -x +x ground

21. X Y 0,0 Falling vy : vertical velocity vy > 0 ground y = y + vy vy

22. X Y 0,0 Jumping vy : vertical velocity vy < 0 ground y = y + vy vy

23. x y 0,0 Hit Detection Hit Boxes: Are the rectangles overlapping? 5,10 15,5 width height https://en.wikipedia.org/wiki/Hit-testing

24. x y 0,0 Center xc = x + height / 2 yc = y + widht / 2 xc = 5 + 11 / 2 = 8 yc = 5 + 11 / 2 = 8 center = p(8, 8) 5,5 width = 11 height=11c

25. x y 0,0 Distance https://en.wikipedia.org/wiki/Pythagorean_theorem cTrollX - cRacoonX cTrollY-cRacoonY distance = sqrt(a^2 + b^2) distance a b

26. Ruby GOSU https://github.com/jlnr/gosu/

27. https://github.com/jlnr/gosu/wiki/Window-Main-Loop

28. RG Tutorial* https://github.com/FloorD/gosu_tutorial_RG_TH *work in progress

29. Images http://www.flickr.com/photos/71753457@N00/2490975442/ orangeacid http://www.flickr.com/photos/83542829@N00/2778794704/ William Hook http://www.flickr.com/photos/60648084@N00/2462966749/ Ѕolo http://www.flickr.com/photos/34196372@N04/5906065484/ Keith Bloomfield http://www.flickr.com/photos/99652207@N00/421447321/ Charles Williams http://www.flickr.com/photos/97223988@N00/6432357463 Flооd http://www.flickr.com/photos/45145879@N00/47714548/" 4tik http://www.flickr.com/photos/89455291@N00/4402938286 Fr3d.org http://www.flickr.com/photos/14443853@N07/5362778675 superUbO http://www.flickr.com/photos/26291754@N02/3720812250 Jen Son http://www.flickr.com/photos/14384226@N07/4768786395 Matteo Sorba

Programmin games - A 10 minute crash course

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