Aaron,
I've run into one small problem (probably because I don't really
understand how graphics work).
I've figured out how to use x, y, cx, cy, md, bk, CardNumber, Rank,
Suit, etc., etc., in your sample War card game program, but what I can't
figure out is how to handle the hdc (handle for device context) <sigh>.
What I want to do is something very simple: someone clicks on a
PushButton, and the Ace of Spades appears in a certain location on the
screen. If I can figure out how to do that much, I can do anything else
I need to do at this point to port over the card trick program and to
write some other fun programs (including some simple solitaire programs)..
I'm not sure which "Draw" method to use, but whichever one it is, it
will involve passing a value for hdc. I've figured out that I need to
use Hacks.HDCFromGraphics(g) to get a value for hdc, but I don't know
what to do about the "g." How do I get a value for "g"?? In the
program, I note that it always seems to come into a Sub as a passed
parameter, but I can't seem to see anything on the outside of the Sub
that is passing anything in. Example: the Paint event handler. The
Paint event isn't called by code; it "just happens."
I'm probably missing something very fundamental here. I panic over
graphics. Other types of things that you mentioned in your article I
can do. For example, I didn't understand the graphics in William Yu's
addictive Shisen-So either, but that didn't stop me from adding a high
score feature, the ability to save and reload games, the ability to go
back a step at a time (all the way to the beginning, if desired) or,
having gone back, to go forward again, etc.
But I have trouble following what's going on with "g for graphics,"
partly because when you see changes on the screen, often the code that
caused the changes really was executed a while back, often in a totally
different Method. Thus stepping through the code one step of time,
watching to see what happens when a particular line is executed, often
doesn't reveal much. (And "refresh"? Sometimes it apparently erases
the screen, whereas at other times it makes visible things that have
already been prepared. I don't get it.)
But I can get a lot of mileage out of knowing how to do relatively
simple things, such as making a particular card visible at a particular
location. Any assistance toward that end - from you or from any others
here - will be much appreciated. It's probably pretty elementary stuff
to many here, but not so for me.
Barry Traver
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