Create a matrix from a .csv file

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?

mrjj

Yes you can add to a dialog the same way as to any other UI :)

To use your custom widget.
Go to your main window ui file and open it
place a normal Qwidget on the form
RIGHt click it
alt text
and choose promote to

Then in the new window , fillin the class name

alt text
nake SURE to spell it as shown in file!
MatrixWidget for "class name"
Case matters!

now press ADD
then Press Promote.

When you run the app, our custom widget will be shown instead of the plain one we added.