Create a matrix from a .csv file

mrjj

@AliM93
Super!
Could you open Punti_tappetino.csv in textEditor and copy it to say
https://paste.ofcode.org/
and give me url ?
Then i also have some real data to read it to check loaddata works :)

AliM93

@mrjj Done! are you seing it?

mrjj

@AliM93
where is the url ?

you have to press paste it and then copy the adress from the top of browser
like
https://paste.ofcode.org/vYJiPZBPqzaDNArjpqPYE7
(just test)

AliM93

@mrjj https://paste.ofcode.org/XLhSxBmaWcaKj2L9CapQ3s

sorry my bad

i have also to declare the function iLoadData in the .h file, right? in the private, protected or in the public slot?

mrjj

@AliM93
ah better :)
yes also add to public section.
we might call it from outside so its public.

AliM93

@mrjj ok! but i get some trouble with the struct. invalid use of non-static data member.

mrjj

@AliM93
can you show line where it says that ´
Mine compiles fine.

AliM93

This post is deleted!

mrjj

@AliM93
nope its not cmake

it seems you forgot the ending of the DataPoint class ?
the }; part ?

struct DataPoint {
    int x;
    int y;
    bool value;
    QColor DrawColor; // we change this from selected / not selected.
    bool isSelected; // we set this when we click on it.
};

AliM93

sorry.
solved. and now in public slot :
i add : void::Matrixwidget LoadData?

mrjj

@AliM93 said in Create a matrix from a .csv file:

void::Matrixwidget LoadData?

yes but mind the use of ::
its only use outside class so in .h its just

void LoadData();

AliM93

done! thanks, now we have to modify the paintevent in order to show the grid, right?

mrjj

@AliM93

Ok, small fix.
You data has max x,y as
x: 14 y: 21
so our array is one to small as we start in 0 (zero)
so change

const int max_x = 14;
const int max_y = 21;

to

const int max_x = 15;
const int max_y = 22;

as else we drop some :)

AliM93

@mrjj ok thanks

mrjj

Ok next step is to add some paint code.

So in .cpp

void MatrixWidget::paintEvent(QPaintEvent *event)
{

    QPainter p(this);
    // draw frame.
    p.drawRect(0, 0, width() - 1, height() - 1);

    // size of area we have. w = width , h = height , we take 2 pixles for border
    int w = width() - 2;
    int h = height() - 2;

    // now we find out how big each box should be which area we have  divided with how many on x and y
    int bw = w / max_x;
    int bh = h / max_y;

    // now we loop and drw the boxes
    for (int xi = 0; xi < max_x; ++xi) {
        for (int yi = 0; yi < max_x; ++yi) {
            p.drawRect( QRect( xi * bw, yi * bh, bw, bh  ) )  ;
        }
    }

}

and then next we will add to some UI so we can see what it start working :)
Teaser.
alt text

AliM93

@mrjj thanks also for comments, so i can better follow the flow. but sorry i have to include QPainter somewhere? yes solved!

mrjj

@AliM93
Yep, need includes.

I hope comments are enough to understand it.
its just calculating how big each box should when we have max_x and max_y and some area ( the widgets area)

Shall we try to add it and UI and see something?
I want to show you a Creator feature called Promotion that makes it easy to use such custom control.

(note i bumped your upvotes so you should be able to post faster now)

AliM93

@mrjj sure! the only thing is, as you can image from my images, i'm working into a bigger file, and when i run the app i have also a main_window.ui. so i have to link all the things to that. is it possilbe, isn'it it?

mrjj

@AliM93
yes, i though we add it to your main ui to see its working ?

Its same project still, correct ?

AliM93

@mrjj yes, but in the final project i need to add to a QDialog which starts after i click a button on the main_window, but i hope it is not a big problem, right? anyway we can use a pushbutton clicked to show this now?