We must have some way to discover which card is clicked by the user. The cards are displayed in a graphicbox or graphics window, so we can trap mouse events. We'll trap the leftButtonUp event. To do this, we must first setfocus to the graphicbox. When the left button is released, we go to a branch label where we do the checking.

'trap mouse clicks:#1.g "setfocus; when leftButtonUp [checkIndex]"

When the cards are dealt, they are placed in a grid that is 100x100, so it is easy to determine which card is clicked by checking mouse position. Actual card height is about 100 pixels, and width is about 80 pixels.

Mouse position is contained in the variables MouseX and MouseY . To make the lines of code shorter, we've copied these values into mx and my .

mx=MouseX: my=MouseY'mouse x and y location

Once we know the mouse coordinates, we can check them against the card coordinates to see which card from our card array was clicked. We start by determining the row. We'll use Select Case to do this. Once a case has been satisfied, the program quits checking and jumps to the End Select line. We've set up our Select Case statement without a case specified. This allows us to use an expression after each Case statement.

First, we'll check to see if the mouse Y coordinate is less than or equal to 102, placing it in the first row of cards. If it is, we do more checking for the x coordinate, then jump out to the End Select line.

case my<=102'first row

Each additional row is 100 pixels lower than the previous row. This code checks to see which of the four rows contains the mouse click.

The first six cards are dealt in the first row. To check which of the cards in the first row was clicked, we check the x location and set the variable clickCard equal to the index of the card:

if mx<=90then clickCard=1if(mx>=110)and(mx<=190)then clickCard=2if(mx>=210)and(mx<=290)then clickCard=3if(mx>=310)and(mx<=390)then clickCard=4if(mx>=410)and(mx<=490)then clickCard=5if(mx>=510)and(mx<=590)then clickCard=6

We perform a similar check on the second row, then on the third and fourth rows. The second row check:

if mx<=90then clickCard=7if(mx>=110)and(mx<=190)then clickCard=8if(mx>=210)and(mx<=290)then clickCard=9if(mx>=310)and(mx<=390)then clickCard=10if(mx>=410)and(mx<=490)then clickCard=11if(mx>=510)and(mx<=590)then clickCard=12

Turning it Over

Once we know which card in the array was clicked, we want to turn it over so that the user can see the face. We've discussed changing the card from face-down to face-up in a previous lesson. After we make the change, we want to deal the card again in with its face up.

'turn card so that it is face upCall SetCardStatus card(clickCard),1'deal card again so that it displays face upCall DealCard hBox, card(clickCard), x, y

Card Coordinates

We need to know where to deal the card in a face-up position. The mouse coordinates do not equal the card's upper left coordinates. We can figure the card coordinates at the same time as we find out which card was clicked. We set the variables x and y to equal the proper upper left coordinates for the card that was clicked, right in our Select Case routine:

Here is the entire routine. The complete demo is at the end of this article.

[checkIndex]
clickCard=0:x=0:y=0'reset values
mx=MouseX: my=MouseY'mouse x and y location'Cards are placed in a grid that is 100x100,'so it is easy to determine which card is clicked'by checking mouse position. Card height is about'100, and width is about 80.'Index of clicked card is placed in var called clickCard'and x,y locations are placed in vars called x and y.'MouseY determines row, and MouseX determines column.selectcasecase my<=102'first row
y=2if mx<=90then clickCard=1:x=10if(mx>=110)and(mx<=190)then clickCard=2:x=110if(mx>=210)and(mx<=290)then clickCard=3:x=210if(mx>=310)and(mx<=390)then clickCard=4:x=310if(mx>=410)and(mx<=490)then clickCard=5:x=410if(mx>=510)and(mx<=590)then clickCard=6:x=510case(my>=102)and(my<202)'second row
y=102if mx<=90then clickCard=7:x=10if(mx>=110)and(mx<=190)then clickCard=8:x=110if(mx>=210)and(mx<=290)then clickCard=9:x=210if(mx>=310)and(mx<=390)then clickCard=10:x=310if(mx>=410)and(mx<=490)then clickCard=11:x=410if(mx>=510)and(mx<=590)then clickCard=12:x=510case(my>=202)and(my<302)'third row
y=202if mx<=90then clickCard=13:x=10if(mx>=110)and(mx<=190)then clickCard=14:x=110if(mx>=210)and(mx<=290)then clickCard=15:x=210if(mx>=310)and(mx<=390)then clickCard=16:x=310if(mx>=410)and(mx<=490)then clickCard=17:x=410if(mx>=510)and(mx<=590)then clickCard=18:x=510case(my>=302)and(my<402)'fourth row
y=302if mx<=90then clickCard=19:x=10if(mx>=110)and(mx<=190)then clickCard=20:x=110if(mx>=210)and(mx<=290)then clickCard=21:x=210if(mx>=310)and(mx<=390)then clickCard=22:x=310if(mx>=410)and(mx<=490)then clickCard=23:x=410if(mx>=510)and(mx<=590)then clickCard=24:x=510caseelse
clickCard=0endselectif clickCard=0thenwait'turn card so that it is face upCall SetCardStatus card(clickCard),1'deal card again so that it displays face upCall DealCard hBox, card(clickCard), x, y
#1.g "place 10 420"#1.g "\Card clicked is " ; clickCard ; space$(400)wait

DEMO

See Lesson 1 for QCard DLL and WAV files needed for the demo code.

'An open project card game, begun by Alyce Watson, May 27, 2003.'Uses Qcard32.dll, a freeware library of playing card images.'DLL by Stephen Murphy. Qcard32.DLL website:'http://www.telusplanet.net/public/stevem/'new in cards4.bas:'Cards are dealt face down.'When user clicks with mouse, value of card under'mouse is checked and reported and card status is'changed to face up. Card is redealt so it will appear'in face up position.'new this time:
clickCard=0'index of current card clicked by user[varSetup]
i=0'i will be our counter var in for/next loops
design=1'default design is circlesdim card(24)'array to hold cards
newIndex=0'used when shuffling
tempCard=0'temp var used when shufflinggosub[fillCardArray]'fill array with card valuesnomainwinWindowWidth=640:WindowHeight=480UpperLeftX=1:UpperLeftY=1menu#1,"&File","&New",[new],"E&xit",[quit]menu#1,"&Card Back Design","&Circles",[circles],"&Blue",[blue],_
"&Red",[red],"&Mountain",[mountain],"&Purple",[purple],"M&usic",[music]graphicbox#1.g,0,0,640,440open"Memory Card Game"for window_nf as#1#1"trapclose [quit]"'trap mouse clicks:#1.g "setfocus; when leftButtonUp [checkIndex]"'get graphicbox handle
hBox=hwnd(#1.g)'open the dllopen"qcard32.dll"fordllas#qc
'initialize the deckCall InitializeDeck hBox
[new]Call SetDefaultValues
Call SetCurrentBack design
'draw a nice background#1.g "down; fill 10 190 225"#1.g "backcolor 10 190 225"'temp message for this demo only#1.g "place 10 420"#1.g "\Try Menu File -> New Game to shuffle deck."gosub[shuffleCards]'set xy location to start deal
x=10:y=2for i =1to24'set status of all cards to 0, which is face downCall SetCardStatus card(i),0'deal cardsCall DealCard hBox,card(i),x,y
x=x+100if x>510then'move to next row
x=10
y=y+100endifplaywave"card.wav",sync
'pause 100 milliseconds between cardscall Pause 100scannextwait[checkIndex]
clickCard=0:x=0:y=0'reset values
mx=MouseX: my=MouseY'mouse x and y location'Cards are placed in a grid that is 100x100,'so it is easy to determine which card is clicked'by checking mouse position. Card height is about'100, and width is about 80.'Index of clicked card is placed in var called clickCard'and x,y locations are placed in vars called x and y.'MouseY determines row, and MouseX determines column.selectcasecase my<=102'first row
y=2if mx<=90then clickCard=1:x=10if(mx>=110)and(mx<=190)then clickCard=2:x=110if(mx>=210)and(mx<=290)then clickCard=3:x=210if(mx>=310)and(mx<=390)then clickCard=4:x=310if(mx>=410)and(mx<=490)then clickCard=5:x=410if(mx>=510)and(mx<=590)then clickCard=6:x=510case(my>=102)and(my<202)'second row
y=102if mx<=90then clickCard=7:x=10if(mx>=110)and(mx<=190)then clickCard=8:x=110if(mx>=210)and(mx<=290)then clickCard=9:x=210if(mx>=310)and(mx<=390)then clickCard=10:x=310if(mx>=410)and(mx<=490)then clickCard=11:x=410if(mx>=510)and(mx<=590)then clickCard=12:x=510case(my>=202)and(my<302)'third row
y=202if mx<=90then clickCard=13:x=10if(mx>=110)and(mx<=190)then clickCard=14:x=110if(mx>=210)and(mx<=290)then clickCard=15:x=210if(mx>=310)and(mx<=390)then clickCard=16:x=310if(mx>=410)and(mx<=490)then clickCard=17:x=410if(mx>=510)and(mx<=590)then clickCard=18:x=510case(my>=302)and(my<402)'fourth row
y=302if mx<=90then clickCard=19:x=10if(mx>=110)and(mx<=190)then clickCard=20:x=110if(mx>=210)and(mx<=290)then clickCard=21:x=210if(mx>=310)and(mx<=390)then clickCard=22:x=310if(mx>=410)and(mx<=490)then clickCard=23:x=410if(mx>=510)and(mx<=590)then clickCard=24:x=510caseelse
clickCard=0endselectif clickCard=0thenwait'turn card so that it is face upCall SetCardStatus card(clickCard),1'deal card again so that it displays face upCall DealCard hBox, card(clickCard), x, y
#1.g "place 10 420"#1.g "\Card clicked is " ; clickCard ; space$(400)wait'setting new card back doesn't restart game,'so new back won't show until new game is started:[circles] design=1:goto[setDesign][blue] design=2:goto[setDesign][red] design=3:goto[setDesign][mountain] design=4:goto[setDesign][purple] design=5:goto[setDesign][music] design=6:goto[setDesign][setDesign]Call SetCurrentBack design
'design can be 1,2,3,4,5,6 for 6 possible designswait[fillCardArray]'fill card array'cards 1 to 52 are in the first deck'cards 53 to 104 are in the second deck'use cards Jack through King in each suit, first deck
card(1)=11'jack of clubs
card(2)=12'queen
card(3)=13'king
card(4)=24'jack of diamonds
card(5)=25'queen
card(6)=26'king
card(7)=37'jack of hearts
card(8)=38'queen
card(9)=39'king
card(10)=50'jack of spades
card(11)=51'queen
card(12)=52'king'now use second deck, to fill second half of arrayfor i =1to12
card(i+12)=card(i)+52nextRETURN[shuffleCards]playwave"shuffle.wav",async
'now shuffle cardsfor i =1to24
newIndex=int(rnd(0)*24)+1
tempCard=card(i)'temp var to allow switching values
card(i)=card(newIndex)'this index now contains value from random index
card(newIndex)=tempCard 'random index now contains value from other index'now card(i) has switched values with a random card in the arraynextplaywave"shuffle.wav",sync
RETURN[quit]close#qc:close#1:end'''''''''''''''''''''subs and functions:Sub Pause ms
'pause ms number of millisecondscalldll#kernel32,"Sleep",_
ms aslong, re asvoidEndSubSub InitializeDeck hndle
calldll#qc,"InitializeDeck",_
hndle asulong,r aslongEndSubSub SetCardStatus nC,face
'nC is number of card - 1-52 in first deck and'53-104 in second deck, if used'face: 0=facedown,1=faceupcalldll#qc,"SetCardStatus",nC aslong,_
face aslong,r asvoidEndSubSub DealCard hndle,nC,x,y
'places card on window whose handle is hndle at x,y'nC is number of card - 1-52 in first deck and'53-104 in second deck, if usedcalldll#qc,"DealCard",hndle asulong,nC aslong,_
x aslong,y aslong,r asvoidEndSubSub SetCurrentBack nV
'nV can be 1,2,3,4,5,6 for 6 possible designscalldll#qc,"SetCurrentBack",nV aslong,r asvoidEndSubSub SetDefaultValues
'reset all card properties back to their default values.calldll#qc,"SetDefaultValues",r asvoidEndSub

## QCard DLL Lesson 4

Lesson 3 Lesson 5- Alyce

QCard DLL Lesson 4 | Which card was clicked? | Turning it Over | Card Coordinates | The Mouse Click Checking Routine | DEMO

See Lesson 1 for QCard DLL and WAV files needed for the demo code.

## Which card was clicked?

We must have some way to discover which card is clicked by the user. The cards are displayed in a graphicbox or graphics window, so we can trap mouse events. We'll trap the leftButtonUp event. To do this, we must first setfocus to the graphicbox. When the left button is released, we go to a branch label where we do the checking.

When the cards are dealt, they are placed in a grid that is 100x100, so it is easy to determine which card is clicked by checking mouse position. Actual card height is about 100 pixels, and width is about 80 pixels.

Mouse position is contained in the variables MouseX and MouseY . To make the lines of code shorter, we've copied these values into mx and my .

Once we know the mouse coordinates, we can check them against the card coordinates to see which card from our card array was clicked. We start by determining the row. We'll use Select Case to do this. Once a case has been satisfied, the program quits checking and jumps to the End Select line. We've set up our Select Case statement without a case specified. This allows us to use an expression after each Case statement.

First, we'll check to see if the mouse Y coordinate is less than or equal to 102, placing it in the first row of cards. If it is, we do more checking for the x coordinate, then jump out to the End Select line.

Each additional row is 100 pixels lower than the previous row. This code checks to see which of the four rows contains the mouse click.

The first six cards are dealt in the first row. To check which of the cards in the first row was clicked, we check the x location and set the variable clickCard equal to the index of the card:

We perform a similar check on the second row, then on the third and fourth rows. The second row check:

## Turning it Over

Once we know which card in the array was clicked, we want to turn it over so that the user can see the face. We've discussed changing the card from face-down to face-up in a previous lesson. After we make the change, we want to deal the card again in with its face up.

## Card Coordinates

We need to know where to deal the card in a face-up position. The mouse coordinates do not equal the card's upper left coordinates. We can figure the card coordinates at the same time as we find out which card was clicked. We set the variables x and y to equal the proper upper left coordinates for the card that was clicked, right in our Select Case routine:

For the sake of this demo, we've noted the index of the card clicked by placing text at the bottom of the window.

## The Mouse Click Checking Routine

Here is the entire routine. The complete demo is at the end of this article.

## DEMO

See Lesson 1 for QCard DLL and WAV files needed for the demo code.

QCard DLL Lesson 4 | Which card was clicked? | Turning it Over | Card Coordinates | The Mouse Click Checking Routine | DEMO

Lesson 3 Lesson 5