b+ Beginners Corner - Printable Version

Code: (Select All)

'_Title "Mod 3 Ron77 Color Walker: a|d left or right, w|s for up or down, c for color change"

'x = 10: y = 10: c = 1

'1 K$ = InKey$: c = (c - (K$ = "c")) Mod 16: Color c: x = x + (K$ = "a") - (K$ = "d"): y = y + (K$ = "w") - (K$ = "s"): Locate y, x: Print "@";: GoTo 1



' b+ 2023-05-30  Breaking the above down:



'  the Title contains the instructions for keypresses

_Title "Mod 3 Ron77 Color Walker: a | d left or right, w | s for up or down, c for color change"



x = 10: y = 10: c = 1 'make assignments inside screen for x and y position of future @ printing



1 K$ = InKey$ ' this records keypress into K$



c = (c - (K$ = "c")) Mod 16

' first (K$ = c) evaluates to -1 or 0 depending if c key was pressed

' (c - (K$ = "c")) evaluates to c - 0 or c - -1 equivalent to adding 0 0r 1 to c

' Mod 16 keeps c from exceeding 15 by resetting back to 0 when it hits 16

' The Mod 16 trick is very handy in computer programming, used allot!



Color c ' colors 0 - 15, 0 = black (same as background color so might be invisible)

' having black is handy for fixing mistakes



' As with changing c, likewise x and y are changed

x = x + (K$ = "a") - (K$ = "d")

' if a or d is pressed x gets changed by -1 or +1



y = y + (K$ = "w") - (K$ = "s")

' if w or s is pressed y gets changed by -1 or +1



Locate y, x

'  note: since there is no border checking Locate will get mad and bug out should you go beyond

'  the screen coodinates. We are going for brevity of code here. Stay away from edges or Error!



Print "@"; ' update our @ characters position (if you can see it)



GoTo 1 ' this loops back to line labeled 1

_Title "Building a Scrolling LED Screen" ' b+ 2021-05-08 Screen _NewImage(1200, 160, 32) _Delay .25 'give screen time to load _ScreenMove _Middle 'and center screen 'scroll some text Text$ = "Try scrolling me for awhile until you got it, then press a key... " lenText = Len(Text$) startTextPos = 1 'put text in sign 15 chars wide in middle of screen print the message moving down 1 character evey frame _Title "Building a Scrolling LED Screen: Step 1 get some code to scroll your message in middle of screen." Do k$ = InKey$ Cls ' two pieces of text? when get to end of text will have less than 15 chars to fill sign so get remainder from front len1 = lenText - startTextPos If len1 < 15 Then len2 = 15 - len1 Else len1 = 15: len2 = 0 ' locate at middle of screen for 15 char long sign _PrintString ((1200 - 15 * 8) / 2, (160 / 2) - 8), Mid$(Text$, startTextPos, len1) + Mid$(Text$, 1, len2) startTextPos = startTextPos + 1 If startTextPos > lenText Then startTextPos = 1 _Display ' no blinking when clear screen so often _Limit 5 ' slow down to see scroll Loop Until Len(k$) ' OK now for the enLARGE M E N T using _PutImage ' our little sign is 16 pixels high and 8 * 15 chars pixels wide = 120 Dim sign As Long sign = _NewImage(120, 16, 32) ' we will store the print image here ' _PUTIMAGE [STEP] [(dx1, dy1)-[STEP][(dx2, dy2)]][, sourceHandle&][, destHandle&][, ][STEP][(sx1, sy1)[-STEP][(sx2, sy2)]][_SMOOTH] ' use same pixel location to _printString as for _PutImage Source rectangle ie (sx1, sy1), -step( sign width and height) ' test screen capture with _putimage and then blowup with _putimage '_PutImage , 0, sign, ((1200 - 15 * 8) / 2, (160 / 2) - 8)-Step(119, 15) 'Cls '_PutImage , sign, 0 ' stretch to whole screen '_Display 'now that that works do it on the move ' about here I resized the screen to 1200 x 160 to make the text scalable X's 10 ie 120 x 10 wide and 16 x 10 high _Title "Building a Scrolling LED Screen: Step 2 Blow it up by using _PutImage twice once to capture, then to expand" k$ = "" Do k$ = InKey$ Cls ' two pieces of text? when get to end of text will have less than 15 chars to fill sign so get remainder from front len1 = lenText - startTextPos If len1 < 15 Then len2 = 15 - len1 Else len1 = 15: len2 = 0 ' locate at middle of screen for 15 char long sign _PrintString ((1200 - 15 * 8) / 2, (160 / 2) - 8), Mid$(Text$, startTextPos, len1) + Mid$(Text$, 1, len2) _PutImage , 0, sign, ((1200 - 15 * 8) / 2, (160 / 2) - 8)-Step(119, 15) Cls _PutImage , sign, 0 ' stretch to whole screen _Display ' no blinking when clear screen so often _Limit 5 ' slow down to see scroll startTextPos = startTextPos + 1 If startTextPos > lenText Then startTextPos = 1 Loop Until Len(k$) ' now for a mask just draw a grid test grid draw here 'For x = 0 To _Width Step 10 ' verticals ' Line (x, 0)-(x + 3, _Height), &HFF000000, BF 'Next 'For y = 0 To _Height Step 10 ' Line (0, y)-(_Width, y + 3), &HFF000000, BF 'Next _Title "Building a Scrolling LED Screen: Step 3 Mask or Cover the thing with a grid or grate." ' here is the whole code with all setup variables k$ = "" Do k$ = InKey$ Cls ' two pieces of text? when get to end of text will have less than 15 chars to fill sign so get remainder from front len1 = lenText - startTextPos If len1 < 15 Then len2 = 15 - len1 Else len1 = 15: len2 = 0 ' locate at middle of screen for 15 char long sign _PrintString ((1200 - 15 * 8) / 2, (160 / 2) - 8), Mid$(Text$, startTextPos, len1) + Mid$(Text$, 1, len2) _PutImage , 0, sign, ((1200 - 15 * 8) / 2, (160 / 2) - 8)-Step(119, 15) Cls _PutImage , sign, 0 ' stretch to whole screen ' now for a mask just draw a grid best to draw this and copy and layover screen as another layer ' here QB64 is fast evough to redarw each time For x = 0 To _Width Step 10 ' verticals Line (x, 0)-(x + 3, _Height), &HFF000000, BF Next For y = 0 To _Height Step 10 Line (0, y)-(_Width, y + 3), &HFF000000, BF Next _Display ' no blinking when clear screen so often _Limit 5 ' slow down to see scroll startTextPos = startTextPos + 1 If startTextPos > lenText Then startTextPos = 1 Loop Until Len(k$)

Code: (Select All)

W = 800: H = 600 ' b+ updated 2023-06-23

Screen _NewImage(800, 600, 32)

a:

Cls

a = Rnd * W: b = 0: c = Rnd * 6 - 3: d = Rnd * 3 + 3: u = 0: v = 0: x = 400: y = H

Do

    _Title "Click mouse to intersect incoming   MC hits:" + Str$(t) + ", misses:" + Str$(m)

    _PrintString (400, 594), "^"

    While _MouseInput: Wend

    If _MouseButton(1) Then e = _MouseX - 400: f = _MouseY - H: z = (e ^ 2 + f ^ 2) ^ .5: u = 5 * e / z: v = 5 * f / z

    x = x + u: y = y + v: a = a + c: b = b + d

    If x < 0 Or y < 0 Or a < 0 Or b < 0 Or x > W Or a > W Or b > H Then

        If b > H Or x < 0 Or y < 0 Or x > W Then m = m + 1

        GoTo a:

    End If

    If ((x - a) ^ 2 + (y - b) ^ 2) ^ .5 < 30 Then

        For r = 1 To 20 Step 4

            Circle ((x + a) / 2, (y + b) / 2), r

            _Limit 60

        Next

        t = t + 1: GoTo a:

    Else

        PSet (x, y): PSet (a, b)

    End If

    _Limit 20

Loop

Code: (Select All)

Option _Explicit '                          Get into this habit and save yourself grief from Typos



_Title "Missile Command Terryfied" '                                     another b+ mod 2023-06-23

'                                   I probably picked up this game at the JB forum some years ago.



'    Get Constants, Shared Variables and Arrays() declared. These Will Start with Capital Letters.

'        Get Main module variables and arrays declared with starting lower case letters for local.

'         This is what Option _Explicit helps, by forcing us to at least declare these before use.

'       While declaring, telling QB64 the Type we want to use, we can also give brief description.





Const ScreenWidth = 800, ScreenHeight = 600 '                     for our custom screen dimensions

Dim As Integer bombX, bombY '                          incoming bomb screen position to shoot down

Dim As Single bombDX, bombDY '                  DX and DY mean change in X position and Y position

Dim As Integer missileX, missileY '                                               missile position

Dim As Single missileDX, missileDY '                            change X and Y of Missile position

Dim As Integer hits, misses '                                                score hits and misses

Dim As Integer mouseDistanceX, mouseDistanceY '       for calculations of missile DX, DY direction

Dim As Single distance '                                                                     ditto

Dim As Integer radius '                                      drawing hits with target like circles

Dim As Integer boolean '                         to shorten the code line with a bunch of OR tests



Screen _NewImage(ScreenWidth, ScreenHeight, 32) ' sets up a graphics screen with custom dimensions

'                                          the 32 is for _RGB32(red, green, blue, alpha) coloring.

'

_ScreenMove 250, 60 '             this centers screen in my laptop, you may need different numbers



InitializeForRound: '                             reset game and start a round with a bomb falling

Cls

bombX = Rnd * ScreenWidth '                                starts bomb somewhere across the screen

bombY = 0 '                                                           starts bomb at top of screen

bombDX = Rnd * 6 - 3 '                                  pick rnd dx = change in x between -3 and 3

bombDY = Rnd * 3 + 3 '                 pick rnd dy = change in y between 3 and 6,  > 0 for falling

missileX = ScreenWidth / 2 '                                  missile base at middle across screen

missileY = ScreenHeight - 4 '   missile launch point at missile base is nearly at bottom of screen

missileDX = 0 '                           missile is not moving awaiting mouse click for direction

missileDY = 0 '                                                                              ditto

distance = 0 '                                             distance of mouse click to missile base



Do

    'what's the score?

    _Title "Click mouse to intersect incoming   Hits:" + Str$(hits) + ", misses:" + Str$(misses)

    _PrintString (400, 594), "^" '                                 draw missle base = launch point

    While _MouseInput: Wend '                                             poll mouse to get update

    If _MouseButton(1) Then '               the mouse was clicked calc the angle from missile base

        mouseDistanceX = _MouseX - missileX

        mouseDistanceY = _MouseY - missileY

        distance = (mouseDistanceX ^ 2 + mouseDistanceY ^ 2) ^ .5

        missileDX = 5 * mouseDistanceX / distance

        missileDY = 5 * mouseDistanceY / distance

    End If



    missileX = missileX + missileDX '                                      update missile position

    missileY = missileY + missileDY '                                                        ditto

    bombX = bombX + bombDX '                                                  update bomb position

    bombY = bombY + bombDY '                                                                 ditto



    '                     I am about to use a boolean variable to shorten a very long IF code line

    '                                 boolean is either 0 or -1 when next 2 statements are execued

    '                                            -1/0 or True/False is everything still in screen?

    boolean = missileX < 0 Or missileY < 0 Or bombX < 0 Or bombY < 0

    boolean = boolean Or missileX > ScreenWidth Or bombX > ScreenWidth Or bombY > ScreenHeight

    If boolean Then ' done with this boolean

        '   reuse boolean to shorten another long code line checking if bomb and missile in screen

        boolean = bombY > ScreenHeight Or missileX < 0 Or missileY < 0 Or missileX > ScreenWidth

        If boolean Then misses = misses + 1

        GoTo InitializeForRound

    End If

    '     if the distance between missle and bomb < 20 pixels then the missile got the bomb, a hit

    If ((missileX - bombX) ^ 2 + (missileY - bombY) ^ 2) ^ .5 < 20 Then '  show a strike as target

        For radius = 1 To 20 Step 4 '                        draw concetric circles to show strike

            Circle ((missileX + bombX) / 2, (missileY + bombY) / 2), radius

            _Limit 60

        Next

        hits = hits + 1 '                                                    add hit to hits score

        GoTo InitializeForRound

    Else

        PSet (missileX, missileY), &HFFFFFF00 '                            draw your missle yellow

        PSet (bombX, bombY), &HFF0000FF '                                           draw bomb blue

    End If

    _Limit 20

Loop