vector graphic drawing package in c

This is a discussion on vector graphic drawing package in c within the C Programming forums, part of the General Programming Boards category; Hi all, I am required to submit "vector graphic drawing package in c" and i am not sure exactly what ...

  1. #1
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    vector graphic drawing package in c

    Hi all,

    I am required to submit "vector graphic drawing package in c" and i am not sure exactly what i will be doing because all drawing packages uses mouse to draw stuff but we are not taught/allowed to do that. I was wondering how on earth i am goping to do that.

    I was thinking on the line that first to create a structure and then somehow employing linked lists to store the info of line coordiantes into structure. But what i am not sure of is what would be the final stage and how i will ask the user to put coordinates of line, circle, rectangle etc.

    Important think to note is that this programme is aimed at 8-9 years old. So apparently should be very straight forward.

    Any ideas as to what/how i can present the info nicely on screen will be very appreciated.

    I am not looking for c syntaxes but as to what overall i should be doing. I would call myself an intermediate programmer in c with knowledge of pointers, functions, arrays, linked lists etc. but nothing whatsoever in c++.

    Thanks for reading the thread.

  2. #2
    Frequently Quite Prolix dwks's Avatar
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    You might need Bresenham's line algorithm and the circle algorithm: http://www.brackeen.com/home/vga/shapes.html
    Maybe that's too advanced, though.

    But what i am not sure of is what would be the final stage and how i will ask the user to put coordinates of line, circle, rectangle etc.
    Why not just use scanf()?
    dwk

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  3. #3
    and the hat of int overfl Salem's Avatar
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    > and i am not sure exactly what i will be doing because all drawing packages uses mouse to draw stuff
    So it's a command line driven program then, where you type in things like

    circle 100,100,10
    rectangle 100,100,10,10
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  4. #4
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    Thanx salem

    But problem is that this programme that i am working on is ideal for children aged 8-11 to draw new images from simple shapes like circle, square , rectangle etc. I cant expect them to write coordinates etc

  5. #5
    ATH0 quzah's Avatar
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    Well then you'd better figure out how you plan on getting input first.


    Quzah.
    Hope is the first step on the road to disappointment.

  6. #6
    and the hat of int overfl Salem's Avatar
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    >programme that i am working on is ideal for children aged 8-11 to draw new images
    But you also said "no mouse"

    So like Quzah said, you'd better figure out what you really want before doing anything else.

    Seems to me like you're trying to implement this
    http://el.media.mit.edu/logo-foundat...go/turtle.html
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
    If at first you don't succeed, try writing your phone number on the exam paper.
    I support http://www.ukip.org/ as the first necessary step to a free Europe.

  7. #7
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    You can try implement some faux menu system in DOS, using arrow keys, I don't know.
    Code:
    #include <stdio.h>
    
    void J(char*a){int f,i=0,c='1';for(;a[i]!='0';++i)if(i==81){
    puts(a);return;}for(;c<='9';++c){for(f=0;f<9;++f)if(a[i-i%27+i%9
    /3*3+f/3*9+f%3]==c||a[i%9+f*9]==c||a[i-i%9+f]==c)goto e;a[i]=c;J(a);a[i]
    ='0';e:;}}int main(int c,char**v){int t=0;if(c>1){for(;v[1][
    t];++t);if(t==81){J(v[1]);return 0;}}puts("sudoku [0-9]{81}");return 1;}

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