My code for checking game input.
BlitzMax Forums/BlitzMax Beginners Area/My code for checking game input.
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| I am currently trying to making a 2D platform game. Something like you would see on the classic game consoles. I have a USB joystick for my computer that looks like a SNES/XBOX controller so I am programing with that in mind. I have read several tutorials and am having a blast. But there are a few things I do not grasp at the moment. The whole OOP is new to me. One of the things I read is that you must be careful to only poll user input once a game cycle because it can cause some strange things to happen in your game if you don't because the input may change between checks. Of course I did not account for that when I started... :-) So I started from over from the ground up and this is what I have: Type TGameInput 'Set Varibles for SNES/XBox Type Controller. Global DPad_Up_Pressed:Int=False Global DPad_Down_Pressed:Int=False Global DPad_Left_Pressed:Int=False Global DPad_Right_Pressed:Int=False Global Button_Start_Pressed:Int=False Global Button_Select_Pressed:Int=False Global Button_A_Pressed:Int=False Global Button_B_Pressed:Int=False Global Button_X_Pressed:Int=False Global Button_Y_Pressed:Int=False Global Button_L_Pressed:Int=False Global Button_R_Pressed:Int=False 'Set Keys for Varibles. Global DPad_Up:Int=KEY_UP Global DPad_Down:Int=KEY_DOWN Global DPad_Left:Int=KEY_LEFT Global DPad_Right:Int=KEY_RIGHT Global Button_Start:Int=KEY_ENTER Global Button_Select:Int=KEY_TAB Global Button_A:Int=KEY_X Global Button_B:Int=KEY_Z Global Button_X:Int=KEY_S Global Button_Y:Int=KEY_A Global Button_L:Int=KEY_Q Global Button_R:Int=KEY_W 'Set Varibles for echo. Global EchoControllerInput:Int=False Function CheckInput() If KeyDown(DPad_Up) And Not KeyDown(DPad_Down) If EchoControllerInput Print "Up." DPad_Up_Pressed=True Else DPad_Up_Pressed=False End If If KeyDown(DPad_Down) And Not KeyDown(DPad_Up) If EchoControllerInput Print "Down." DPad_Down_Pressed=True Else DPad_Down_Pressed=False End If If KeyDown(DPad_Left) And Not KeyDown(DPad_Right) If EchoControllerInput Print "Left." DPad_Left_Pressed=True Else DPad_Left_Pressed=False End If If KeyDown(DPad_Right) And Not KeyDown(DPad_Left) If EchoControllerInput Print "Right." DPad_Right_Pressed=True Else DPad_Right_Pressed=False End If If KeyDown(Button_Start) If EchoControllerInput Print "Start." Button_Start_Pressed=True Else Button_Start_Pressed=False End If If KeyDown(Button_Select) If EchoControllerInput Print "Select." Button_Select_Pressed=True Else Button_Select_Pressed=False End If If KeyDown(Button_A) If EchoControllerInput Print "Button A." Button_A_Pressed=True Else Button_A_Pressed=False End If If KeyDown(Button_B) If EchoControllerInput Print "Button B." Button_B_Pressed=True Else Button_B_Pressed=False End If If KeyDown(Button_X) If EchoControllerInput Print "Button X." Button_X_Pressed=True Else Button_X_Pressed=False End If If KeyDown(Button_Y) If EchoControllerInput Print "Button Y." Button_Y_Pressed=True Else Button_Y_Pressed=False End If If KeyDown(Button_L) If EchoControllerInput Print "Button L." Button_L_Pressed=True Else Button_L_Pressed=False End If If KeyDown(Button_R) If EchoControllerInput Print "Button R." Button_R_Pressed=True Else Button_R_Pressed=False End If End Function End Type Then, in may main game loop I run: TGameInput.CheckInput() I added EchoControllerInput for debugging. If it is set to true and you are in a windowed screen it will print out what buttons you are pressing. Also, the first time around I was checking to make sure that the user did not have both the left and right or up and down directions pressed for the update part of my loop. Instead of doing that every time I have now moved it down into the CheckInput Function. I plan to add an option so it will read a controller configuration file so you can save the keyboard/joystick options but I have not made it that far yet. Does anybody have any input on the code? I think I have accounted for most situations. Thanks. |
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Looks ok, if a little lengthy IMHO.If KeyDown(Button_L) If EchoControllerInput Print "Button L." Button_L_Pressed=True Else Button_L_Pressed=False End If to me, is.. Button_L_Pressed=KeyDown(Button_L) because I don't prevent multiple buttons down in the input code, I deal with it in the game logic. Multiple buttons are often used for cheats or combos. If you have player run logic tied to left and right inputs my input would look something like.. If ( KeyDown( KEY_LEFT ) ) 'go left else if ( KeyDown( KEY_RIGHT ) ) ' go right end if A more flexible system would simply allow you to register the inputs you're interested in with the input action tied to it. Most importantly your code will work for your needs right now and you can tweak it later - move forward and get some more game written :) |
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| Just remembered this: http://www.blitzbasic.com/Community/posts.php?topic=85744 |
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