Computer Science Canada Help me with Font.Draw |
| Author: | xStil [ Sat Nov 01, 2008 12:53 pm ] |
| Post subject: | Help me with Font.Draw |
A subprogram to get text form the user and then draw it using Font.Draw. All the variables are declared in the full program. Quote: process TextWrite
mainfont:=Font.New (MainFont+":"+intstr (sz)) var TEXT :string TextActive:=true get TEXT:* Font.Draw (TEXT,linex,liney,mainfont,cl) TextActive:=false end TextWrite The method used to call this subprogram is: Quote: if keys (T) then
delay (50) fork TextWrite end if Again, everything it needs has been declared... The problem is: I launch it, press 't', type the text, and then press enter...the text is written correctly, but I am forced to press enter a few more times (sometimes one more time, others it could take 10 presses) to get out of the get statement... If I don't press enter those few more times, and try to close the window with Window.Close (winID), I get an error "Process "TextWrite": I/O attempted on closed stream 2." Whats wrong in the code??? |
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| Author: | xStil [ Sat Nov 01, 2008 1:08 pm ] |
| Post subject: | RE:Help me with Font.Draw |
I figured it out: The 'TextActive' variable is a variable to allow the whole program to know that TextWrite is functioning, so that most keyboard shortcuts would not be active while I am typing...I added 'and TextActive=false' to the if statement, and now all is well... I guess I forgot to make sure that this if statement knew when to be active and when to be not-active. I might be able to show the program soon!  |
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| Author: | Insectoid [ Sat Nov 01, 2008 1:50 pm ] |
| Post subject: | RE:Help me with Font.Draw |
2 questions, 1. Why are you using processes? Procedures are far more reliable. 2. Why are you using delays? They only slow down the program, which is only useful for animations. |
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| Author: | xStil [ Sat Nov 01, 2008 3:49 pm ] |
| Post subject: | RE:Help me with Font.Draw |
1: I feel more comfortable with calling a subprogram with fork, rather than just write down its name, or put it in a 'variable:=function (x,y...)' But when I have to use procedure/function, then I don't hesitate... More reliable? Don't procedures and functions allow for 'var parameters'? I heard those were risky to use and can cause complications at the smallest error. 2: I used the delay because, sometimes when I press 't' I hold on for longer and it is written down by the get statement I got rid of it tho! |
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