My first attempt at game programming.
Community Forums/Developer Stations/My first attempt at game programming.
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| Hi. Below is the code for my first ever game programmed in BlitzPlus. I delved for a while with C# but i found it unnecessary difficult for me with all those methods,long types, short types, namespaces etc, so i returned to blitzplus. I am still a beginner, but at least i can program a little game in 160 lines of code. I found it very rewarding for a newbie like me to create a game in a programming language. I tried Game Maker Studio in the past however the built in scripting language is nowhere near as easy (and charming!) as B+. Can you please recommend any improvements and/or errors in my code? (I'm still trying to learn how to create a simple menu controlled by the cursor keys....) ;Rev 0.69 07/02/2017 ;by Makis Kampouris AppTitle "Matatias Adventures" Graphics 1024,768,32,2 SetBuffer BackBuffer() SeedRnd MilliSecs() ; R E S O U R C E S L O A D I N G AutoMidHandle True Global img_matatiaslogo = LoadImage ("gfx/matatiaslogo.png") Global img_Matatias = LoadImage ("gfx/Matatias.png") Global img_Diamond = LoadImage ("gfx/Diamond.png") Global img_Enemy = LoadImage ("gfx/cocoviko.png") Global snd_pickup = LoadSound ("snd/Pickup.wav") Global snd_gameover=LoadSound ("snd/gameover.wav") Global fnt_8bitwonder=LoadFont ("8BIT WONDER",20) Global fnt_8bitwonder14=LoadFont ("8BIT WONDER",14) ;Player variables Global matX = 512 Global matY = 384 Global matspeed# = 2.0 Global Score = 0 Global lives = 3 Global diamondsleft = 18 ;T Y P E S Type Diamond Field x Field y Field diamondsleft End Type Type Enemy Field x Field y End Type ;Functions Generatediamonds () Generateenemies () PresSpace () ; M A I N L O O P While Not KeyHit (1) Cls Score () Playermovement() Outofbounds () DrawImage img_Matatias,matX,matY ;draw diamonds For pickup.Diamond = Each Diamond DrawImage img_Diamond,pickup\x, pickup\y ;pick up diamonds If ImagesCollide (img_Diamond,pickup\x,pickup\y,0,img_Matatias,matX,matY,0) PlaySound snd_pickup Score = Score + 10 matspeed = matspeed + 0.5 diamondsleft=diamondsleft-1 Delete pickup Exit End If Next ;draw enemies For cocoviko.Enemy=Each Enemy DrawImage img_Enemy,cocoviko\x,cocoviko\y ;draw game over If ImagesCollide (img_Matatias,matX,matY,0,img_Enemy,cocoviko\x,cocoviko\y,0) Then SetFont fnt_8bitwonder PlaySound snd_gameover lives = lives -1 matX=512 matY=314 Delete cocoviko End If Next Welldone () Endgame () Flip Wend ; F U N C T I O N S ;Player Score Function Score() SetFont fnt_8bitwonder14 Text 10,10," SCORE: " + Score Text 900,10," LIVES : " + lives End Function ;Player movement Function Playermovement() If KeyDown (203) Then matX = matX - matspeed ;left If KeyDown (205) Then matX = matX + matspeed ;right If KeyDown (200) Then matY = matY - matspeed ;up If KeyDown (208) Then matY = matY + matspeed ;down End Function ;Prevents player from moving out of screen Function Outofbounds () If matX > 1008 Then matX = 1008 If matY > 748 Then matY = 748 If matX < 15 Then matX = 15 If matY < 20 Then matY = 20 End Function ;Intro screen "press space" message Function PresSpace() SetBuffer BackBuffer() SetFont fnt_8bitwonder DrawImage img_matatiaslogo,522,200 Text 250,384," Press space to start the game " SetFont fnt_8bitwonder14 Color 255,255,0 Text 390,700, "by Makis Kampouris (c) 2015" Repeat Until KeyHit (57) Flip Cls End Function ;Well done screen Function Welldone () If diamondsleft = 0 Cls SetBuffer BackBuffer () Color Rnd(0,255),Rnd(0,255),Rnd(0,255) Text 420,350," W E L L D O N E " Flip Delay 200 End If End Function ;Endgame screen Function Endgame () If lives=-1 Then Cls Text 512,384, " G A M E O V E R",1,1 Flip Delay 3000 End End If End Function ;Generate diamonds Function Generatediamonds () For z = 1 To 18 pickup.Diamond = New Diamond pickup\x = Rand (1024) pickup\y = Rand (768) Next End Function ;Generate enemies Function Generateenemies() For z=1 To 15 cocoviko.Enemy=New Enemy cocoviko\x=Rand(1024) cocoviko\y=Rand(768) Next End Function |
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| Hi, it is a bit hard to test the code without the media. But if you would like to write a menu which is driven by cursor keys, i have allready explained it in this post (#6 and #11) |
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| Thanks Dan I'll check it out. Can I upload the graphics on the forum? |
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| You have to send a link to where the media is hosted. |
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| Suggestion(I like this free one): https://www.mediafire.com/ |
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| Assets files uploaded to mediafire. http://www.mediafire.com/file/hhhth84iou81htp/Matatias_Adventures.rar |
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| Its Great. It reminds me of an homebrew c64 game, which i used to remake on Amiga with the Amos language. Edit: Right, i have overlook that this code is for BlitzPlus and not Blitz3d (which im using here) but it is running on the both versions. There aren't many errors, maybe few improvements. The Game does not run well, when used in fullscreen display. And i mean the Press space function does not display anything over here. The screen is black. The Game Over and Well done screens flickers with the game over text and the remaining bugs. When you'r using the backbuffer, then it is advisable to use it in this way: Set the Backbuffer Clear the Screen Draw things flip (the backbuffer) repeat it The SetBuffer command can be removed from every function call, because you are not using different buffers in this game. In the function Endgame and Welldone i would replace the delay with an timer variable. Like this: delaytimer=MilliSecs() Repeat Cls Color Rnd(0,255),Rnd(0,255),Rnd(0,255) Text 420,350," W E L L D O N E " Flip Delay 1 Until MilliSecs()-Delaytimer>3000 Here are all the changes i would set up and still keep your way of writing it: And eventually split up the Drawing code and the collision detection code into 2 parts. It makes the code longer, but you will avoid the short flickering, which occurs when the player pickup the first gem/bug in the list. ;draw diamonds diamondnumber=0 For pickup.Diamond = Each Diamond diamondnumber=diamondnumber+1 DrawImage img_Diamond,pickup\x, pickup\y If diamondnumber=1 Then Color $00,$ff,$00 : Rect pickup\x - 10, pickup\y - 10,20,20,0 ;pick up diamonds If you want to see what i mean, use the above code, then before picking up the green squared gem, watch the other gems. |
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| Thanks for your suggestions Dan. I 'll give them a try later. |
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| Is it good practice to use gosub? I read somewhere that it should be avoided. I'm having difficulty to understand the [ Text GraphicsWidth()/2-((Len(txt$)/2)*9),384,txt$] line. |
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| The gosub should be avoided in the cases where you use multiple gosubs where the chance that one return may be missed. Single gosubs with clear returning point should be harmless. I'm having difficulty to understand the [ Text GraphicsWidth()/2-((Len(txt$)/2)*9),384,txt$] line. GraphicsWidth()/2 gives the middle point of the screen horizontaly. The Resolution is set with Graphics 1024,768,32,2 and the half of 1024 is 512. Txt$ holds the text : " Press space to start the game " Len(txt$) gives the length of that text, which should be 31 Len(txt$)/2 gives the half of the length of that text, which is arround 15 the 9 should be the width of the font. multiplied with the half of the text length. it sets the starting point for the text command to halfscreen-(half of textlength * single char width) so the GraphicsWidth()/2-((Len(txt$)/2)*9) gives a number, which alings the text horizontally, so that it appears to be in the middle. It was written so, in case you want to change the graphic resolution, that the text will be centered horizontally on the screen. And if you change the text, it will/should still appear centered to the screen. |
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My advice is to use Strict if Bplus has a strict mode?! |
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| Never heard of strict before!! |
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| No b+ does not have it. Strict is from blitzmax. |
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| Interesting feature. |
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