Rabbit 2600 Posted September 21, 2013 Share Posted September 21, 2013 I've been away from programming for a long time due to moving. And I just got back to it, I remember a lot but not how to do missiles properly. What's wrong with this code? if joy0right && joy0fire then missile0x = player0x - 1 Quote Link to comment Share on other sites More sharing options...
+Gemintronic Posted September 21, 2013 Share Posted September 21, 2013 Seems to compile for me. Here is what version of bB VisualbB reports in its log: batari Basic Compiler date (8/8/2011 7:31:02 PM) Quote Link to comment Share on other sites More sharing options...
+Random Terrain Posted September 21, 2013 Share Posted September 21, 2013 The missile will only move left if the joystick is held to the right and the fire button is held down at the same time. That's what's wrong with it. You might want to look at this example program: http://www.randomterrain.com/atari-2600-memories-batari-basic-commands.html#sprite_missile_example Quote Link to comment Share on other sites More sharing options...
Rabbit 2600 Posted September 21, 2013 Author Share Posted September 21, 2013 Ahh, cheers =) Quote Link to comment Share on other sites More sharing options...
+Gemintronic Posted September 21, 2013 Share Posted September 21, 2013 I'm still not getting what your Missile Troubles are. Does the missile not move? Does it not actually respond to the joystick? Boyfriend troubles? UPDATE: Oops.. R.T. explained it. Nevermind Quote Link to comment Share on other sites More sharing options...
Rabbit 2600 Posted September 21, 2013 Author Share Posted September 21, 2013 (edited) Yeah, the trouble was the missile not moving, I got it working now, haha. =) Hm, I have yet another problem I've forgotten how to do properly. When the missile hits player1 I want it to get 1 of 4 positions chosen at random. And I've gotten that to work but, it instantly goes back to it's original position instead of staying in that position. Any ideas? Source: Blast Zone.bas The code in question: drawscreen if player1x < player0x then player1x = player1x + 1 if player1x > player0x then player1x = player1x - 1 if collision(missile0,player1) then player1x=255 : player1y=255 : missile0x = 255 : missile0y = 255 : a = (rand&3) if a = 0 then player1x=1:player1y=50 if a = 1 then player1x=90:player1y=50 if a = 2 then player1x=80:player1y=1 if a = 3 then player1x=80:player1y=90 The entire code: rem Generated 2013-09-20 23:26:46 by Visual bB Version 1.0.0.554 rem ********************************** rem *<filename> * rem *<description> * rem *<author> * rem *<contact info> * rem *<license> * rem ********************************** rem **************************************************************** rem * rem * Sprite with Missile rem * rem * Example program by Duane Alan Hahn (Random Terrain) using rem * hints, tips, code snippets, and more from AtariAge members rem * such as batari, SeaGtGruff, RevEng, Robert M, Nukey Shay, rem * Atarius Maximus, jrok, supercat, GroovyBee, and bogax. rem * rem **************************************************************** rem * rem * Instructions: rem * rem * Use the joystick to move the sprite. Press the fire button rem * to shoot the missile. rem * rem **************************************************************** rem **************************************************************** rem * rem * Create aliases for variables. rem * rem **************************************************************** rem ` rem ` (You can have more than one alias for each variable.) rem ` rem ```````````````````````````````````````````````````````````````` rem ```````````````````````````````````````````````````````````````` rem ` All-purpose bits for various jobs. rem ` dim _BitOp_All_Purpose_01 = t dim _Bit0_Debounce_Reset = t dim _Bit7_Missile0_Moving = t rem ```````````````````````````````````````````````````````````````` rem ` Player0/Missile0 direction bits. rem ` dim _BitOp_P0_M0_Direction = u dim _Bit0_Player0_Direction_Up = u dim _Bit1_Player0_Direction_Down = u dim _Bit2_Player0_Direction_Left = u dim _Bit3_Player0_Direction_Right = u dim _Bit4_Missile0_Direction_Up = u dim _Bit5_Missile0_Direction_Down = u dim _Bit6_Missile0_Direction_Left = u dim _Bit7_Missile0_Direction_Right = u rem **************************************************************** rem * rem * Defines the edges of the playfield for an 8 x 8 sprite. rem * If your sprite is a different size, you`ll need to adjust rem * the numbers. rem ` def _P_Edge_Left=1 def _P_Edge_Right=153 def _P_Edge_Top=9 def _P_Edge_Bottom=88 rem **************************************************************** rem * rem * Defines the edges of the playfield for the missile. rem * If the missile is a different size, you`ll need to adjust rem * the numbers. rem ` def _M_Edge_Left=2 def _M_Edge_Right=158 def _M_Edge_Top=2 def _M_Edge_Bottom=87 rem **************************************************************** rem **************************************************************** rem * rem * Program Start/Restart rem * rem ` __Start_Restart rem **************************************************************** rem * rem * Mute volume of both sound channels. rem ` AUDV0 = 0 : AUDV1 = 0 rem **************************************************************** rem * rem * Clears all normal variables. rem ` for temp5 = 0 to 25 : a[temp5] = 0 : next rem **************************************************************** rem * rem * Starting position of Player0. rem ` player0x = 77 : player0y = 53 rem **************************************************************** rem * rem * Makes sure Missile0 is off the screen. rem ` missile0x = 200 : missile0y = 200 rem **************************************************************** rem * rem * Defines Missile0 size. rem ` NUSIZ0 = $10 : missile0height = 1 rem **************************************************************** rem * rem * Sets beginning direction that Missile0 will shoot if the rem * player doesn`t move. rem ` _Bit3_Player0_Direction_Right{3} = 1 rem **************************************************************** rem * rem * Debounce the reset switch. (Holding it down won`t make it rem * keep resetting.) rem ` _Bit0_Debounce_Reset{0} = 1 player0x = 70 player0y = 50 player1x = 1 player1y = 50 MAIN_LOOP a = 0 COLUP0 = $2A COLUP1 = $2A if joy0down then player0: %01100110 %11000011 %10011001 %10100101 %10100101 %10011001 %11000011 %01111110 end if joy0up then player0: %01111110 %11000011 %10011001 %10100101 %10100101 %10011001 %11000011 %01100110 end if joy0left then player0: %01111110 %11000011 %10011001 %00100101 %00100101 %10011001 %11000011 %01111110 end if joy0right then player0: %01111110 %11000011 %10011001 %10100100 %10100100 %10011001 %11000011 %01111110 end f=f+1 rem POSSIBLY INEFFICIENT CODE, SEPARATE COLOR INFO FOR EACH FRAME... if f = 10 then player1: %01111110 %11000011 %10000001 %01100000 %01100000 %10000001 %11000011 %01111110 end if f = 20 then player1: %01111110 %11000011 %10000001 %00110000 %00110000 %10000001 %11000011 %01111110 end if f = 30 then player1: %01111110 %11000011 %10000001 %00011000 %00011000 %10000001 %11000011 %01111110 end if f = 40 then player1: %01111110 %11000011 %10000001 %00001100 %00001100 %10000001 %11000011 %01111110 end if f = 50 then player1: %01111110 %11000011 %10000001 %00000110 %00000110 %10000001 %11000011 %01111110 end if f = 60 then player1: %01111110 %11000011 %10000001 %01000010 %01000010 %10000001 %11000011 %01111110 end if f=60 then f=0 rem **************************************************************** rem * rem * Joystick movement precheck. rem * rem ```````````````````````````````````````````````````````````````` rem ` If joystick isn`t moved in any direction, skip this section. rem ` if !joy0up && !joy0down && !joy0left && !joy0right then goto __Skip_Joystick_Precheck rem ```````````````````````````````````````````````````````````````` rem ` Joy0 has been moved. Clear Player0 direction bits. rem ` _BitOp_P0_M0_Direction = _BitOp_P0_M0_Direction & %11110000 __Skip_Joystick_Precheck rem **************************************************************** rem * rem * Joy0 Up rem * rem ```````````````````````````````````````````````````````````````` rem ` If joystick isn`t moved up, skip this section. rem ` if !joy0up then goto __Skip_Joy0_Up rem ```````````````````````````````````````````````````````````````` rem ` Turn on the up direction bit. rem ` _Bit0_Player0_Direction_Up{0} = 1 rem ```````````````````````````````````````````````````````````````` rem ` If hitting the edge, skip this section. rem ` if player0y <= _P_Edge_Top then goto __Skip_Joy0_Up rem ```````````````````````````````````````````````````````````````` rem ` Move Player0 up. rem ` __Skip_Joy0_Up rem **************************************************************** rem * rem * Joy0 Down rem * rem ```````````````````````````````````````````````````````````````` rem ` If joystick isn`t moved down, skip this section. rem ` if !joy0down then goto __Skip_Joy0_Down rem ```````````````````````````````````````````````````````````````` rem ` Turn on the down direction bit. rem ` _Bit1_Player0_Direction_Down{1} = 1 rem ```````````````````````````````````````````````````````````````` rem ` If hitting the edge, skip this section. rem ` if player0y >= _P_Edge_Bottom then goto __Skip_Joy0_Down rem ```````````````````````````````````````````````````````````````` rem ` Move Player0 down. rem ` __Skip_Joy0_Down rem **************************************************************** rem * rem * Joy0 Left rem * rem ```````````````````````````````````````````````````````````````` rem ` If joystick isn`t moved to the left, skip this section. rem ` if !joy0left then goto __Skip_Joy0_Left rem ```````````````````````````````````````````````````````````````` rem ` Turn on the left direction bit. rem ` _Bit2_Player0_Direction_Left{2} = 1 rem ```````````````````````````````````````````````````````````````` rem ` If hitting the edge, skip this section. rem ` if player0x <= _P_Edge_Left then goto __Skip_Joy0_Left rem ```````````````````````````````````````````````````````````````` rem ` Move Player0 to the left. rem ` __Skip_Joy0_Left rem **************************************************************** rem * rem * Joy0 Right rem * rem ```````````````````````````````````````````````````````````````` rem ` If joystick isn`t moved to the right, skip this section. rem ` if !joy0right then goto __Skip_Joy0_Right rem ```````````````````````````````````````````````````````````````` rem ` Turn on the right direction bit. rem ` _Bit3_Player0_Direction_Right{3} = 1 rem ```````````````````````````````````````````````````````````````` rem ` If hitting the edge, skip this section. rem ` if player0x >= _P_Edge_Right then goto __Skip_Joy0_Right rem ```````````````````````````````````````````````````````````````` rem ` Move Player0 to the right. rem ` __Skip_Joy0_Right rem **************************************************************** rem * rem * Fire Button: rem * rem * If fire button is pressed and Missile0 is not moving, turn rem * on Missile0 movement. rem * rem ```````````````````````````````````````````````````````````````` rem ` If the fire button is not pressed, skip this section. rem ` if !joy0fire then goto __Skip_Fire rem ```````````````````````````````````````````````````````````````` rem ` If Missile0 is moving, skip this section. rem ` if _Bit7_Missile0_Moving{7} then goto __Skip_Fire rem ```````````````````````````````````````````````````````````````` rem ` Turn on Missile0 movement. rem ` _Bit7_Missile0_Moving{7} = 1 rem ```````````````````````````````````````````````````````````````` rem ` Set up starting position of Missile0. rem ` missile0y = player0y - 4 : missile0x = player0x + 4 rem ```````````````````````````````````````````````````````````````` rem ` Take a `snapshot` of Player0 direction so Missile0 will rem ` stay on track until it hits something. rem ` _Bit4_Missile0_Direction_Up{4} = _Bit0_Player0_Direction_Up{0} _Bit5_Missile0_Direction_Down{5} = _Bit1_Player0_Direction_Down{1} _Bit6_Missile0_Direction_Left{6} = _Bit2_Player0_Direction_Left{2} _Bit7_Missile0_Direction_Right{7} = _Bit3_Player0_Direction_Right{3} __Skip_Fire rem **************************************************************** rem * rem * Move Missile0. rem * rem ```````````````````````````````````````````````````````````````` rem ` If Missile0 isn`t moving, skip this section. rem ` if !_Bit7_Missile0_Moving{7} then goto __Skip_Missile rem ```````````````````````````````````````````````````````````````` rem ` Move Missile0 in the appropriate direction. rem ` if _Bit4_Missile0_Direction_Up{4} then missile0y = missile0y - 2 if _Bit5_Missile0_Direction_Down{5} then missile0y = missile0y + 2 if _Bit6_Missile0_Direction_Left{6} then missile0x = missile0x - 2 if _Bit7_Missile0_Direction_Right{7} then missile0x = missile0x + 2 rem ```````````````````````````````````````````````````````````````` rem ` Clear Missile0 if it hits the edge of the screen. rem ` if missile0x < _M_Edge_Left then goto __Skip_to_Clear_Missile if missile0x > _M_Edge_Right then goto __Skip_to_Clear_Missile if missile0y < _M_Edge_Top then goto __Skip_to_Clear_Missile if missile0y > _M_Edge_Bottom then goto __Skip_to_Clear_Missile rem ```````````````````````````````````````````````````````````````` rem ` Clear Missile0 if it hits a playfield pixel. rem ` if collision(playfield,missile0) then goto __Skip_to_Clear_Missile goto __Skip_Missile __Skip_to_Clear_Missile rem ```````````````````````````````````````````````````````````````` rem ` Clear Missile0 moving bit and move Missile0 off the screen. rem ` _Bit7_Missile0_Moving{7} = 0 missile0x = 200 : missile0y = 200 __Skip_Missile drawscreen if player1x < player0x then player1x = player1x + 1 if player1x > player0x then player1x = player1x - 1 if collision(missile0,player1) then player1x=255 : player1y=255 : missile0x = 255 : missile0y = 255 : a = (rand&3) if a = 0 then player1x=1:player1y=50 if a = 1 then player1x=90:player1y=50 if a = 2 then player1x=80:player1y=1 if a = 3 then player1x=80:player1y=90 rem **************************************************************** rem * rem * Reset Program: rem * rem * Any Atari 2600 program should restart when the reset switch rem * is pressed. It is part of the usual standards and procedures. rem * rem ```````````````````````````````````````````````````````````````` rem ` If the reset switch is not pressed, turn off debounce and rem ` skip this section. rem ` if !switchreset then _Bit0_Debounce_Reset{0} = 0 : goto __Skip_Main_Reset rem ```````````````````````````````````````````````````````````````` rem ` If the reset switch hasn`t been released, skip this section. rem ` if _Bit0_Debounce_Reset{0} then goto __Skip_Main_Reset rem ```````````````````````````````````````````````````````````````` rem ` Restart the program. rem ` goto __Start_Restart __Skip_Main_Reset goto MAIN_LOOP Edited September 21, 2013 by Rabbit 2600 Quote Link to comment Share on other sites More sharing options...
Rabbit 2600 Posted September 21, 2013 Author Share Posted September 21, 2013 Nevermind, it was a = 0 that messed things up =) Quote Link to comment Share on other sites More sharing options...
Rabbit 2600 Posted September 21, 2013 Author Share Posted September 21, 2013 But I can't seem to make player1 move towards player0. I tried if a = 0 then player1x=1:player1y=50 : player1x = player1x + 1 but it dosn't do anything. Quote Link to comment Share on other sites More sharing options...
bogax Posted September 21, 2013 Share Posted September 21, 2013 (edited) You always set player1 according to a regardless of whether there's a collision. If there is a collision, you don't need to set player1x,y to 255 because you're going to set it according to a immediately anyway. Setting player1 with look up table indexed by a would probably be shorter and faster. something like this maybe if collision(missile0,player1) then a = rand & 3 : player1x=p1x[a] : player1y=p1y[a] : missile0x = 255 : missile0y = 255 data p1x 1, 90, 80, 80 end data p1y 50, 50, 1, 90 end Edited September 21, 2013 by bogax Quote Link to comment Share on other sites More sharing options...
Rabbit 2600 Posted September 21, 2013 Author Share Posted September 21, 2013 (edited) Mm'kay. How would I work with tables? I have no experience with such things =) And I've tried just using if player1x < player0x then player1x = player1x by itself. Which is what you mean if I understood you correctly? But it didn't do anything either. Edited September 21, 2013 by Rabbit 2600 Quote Link to comment Share on other sites More sharing options...
Rabbit 2600 Posted September 21, 2013 Author Share Posted September 21, 2013 Interesting, that seems a bit more efficient. Thank you =) Hm, I'm making small progress towards player1 moving towards player0. I managed to get it moving once. Then it stopped working, strange, but I think I'll find the solution soon. Quote Link to comment Share on other sites More sharing options...
bogax Posted September 21, 2013 Share Posted September 21, 2013 (edited) Interesting, that seems a bit more efficient. Thank you =) Hm, I'm making small progress towards player1 moving towards player0. I managed to get it moving once. Then it stopped working, strange, but I think I'll find the solution soon. Did you try that collision code? (it moves in the x direction but not the y direction) (not surprising because you're not moving it in the y direction) Edited September 21, 2013 by bogax Quote Link to comment Share on other sites More sharing options...
Rabbit 2600 Posted September 21, 2013 Author Share Posted September 21, 2013 Ah! That explains it, it was the y direction I had problem with. Fixed it and now it works. A thousand thanks =) Quote Link to comment Share on other sites More sharing options...
Like us on Facebook
Follow us on Twitter
AtariAge on Instagram
Watch us on YouTube
Chat on Discord
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.