How to include .txt on Qt

[SGaist]

Hi and welcome to devnet,

Do you want a file with these values ? e.g. an XML or JSON structure ? Or are real database like SQLite ?

[KzR69100]

My project is :

I have a pixeled picture (with i think 50 square who contained 1 color by square) my program already detect the color(in RGB), and for every color i have a picture and a price.

So i thought of create a kind of database who contained a picture and a price for "every color" (i know that there is an infinite of color so i will choose only the most used color for a picture) and what i want is that for a red color for example (255,0,0 in rgb) it will replace by a picture (that i will choose) and a price

so at the end it will count all price and return me like 255 dollars (for example)

[darius]

Hi,
I am taking this opportunity to ask you how to enter Subject line in new post edited since I see no Subject line input box under Firefox for Windows XP.
All I see top is blue and no room to enter subject of my post.

thank you

[SGaist]

What kind of picture do you have in mind ? What size ?

@darius Please don't highjack other's people thread with unrelated questions.

When you create a new topic you have line edit which contains "Enter your topic title here..."
If you want to edit late use the three doted menu on the far right and you'll have your topic title editable at the same place.

[KzR69100]

it depends, but at the end i will have only 40 - 50 squares with just one color in them.

So what i want is that Qt replace a color by a picture, ( so i will have 40 - 50 pictures ) and a total price (like 100 dollars)

[LuGRU]

@KzR69100
My 2 cents :)

I would go with custom class / structure and serialization. That way there is no need for any kind of database / parsing (per say).
Also id squares not by color, because after fill You will loose that color, but by some sort of id and keep it's rectangle.

[Buckwheat]

@KzR69100 ... @LuGRU gives good advice. But, if you use an ID then your database idea would work as you could make the ID the table entry ID.

The only recommendation I have is to look at what you are trying to solve. What is the future of what you are trying to solve. Then, pick the appropriate solution. I have seen too many times solutions that don't fit the problem to solve because of a "cool tool" or package someone just had to use.

[KzR69100]

I have a function who return me a color (QColor function)

QColor Color(...){

return color;
}

like that, and i thought that after the "return color" i will have a "if color == red, add 6 dollars, and replace it by a picture"

the problem is that i will have to do this with many colors so it will take a lot of place in my code, thats why i thought use a database that i will include in my Qt who contained a sort of "x = add 6 dollars, and replace it by a picture"

so i will just have to do :

if color == red, red = x ;

is this possible ?

[darius]

@SGaist said in How to include .txt on QT:

When you create a new topic you have line edit which contains "Enter your topic title here..."

When I was trying to create a new topic for the last 3 days, forum.qt.io opened in Firefox (latest version) for Windows with oversized font header and blue header frame was made of two lines.
Topic input frame was lost due to the bug in html code.

In the meantime I have notified Qt about the bug and today Input box for topic title is back.
There is another bug in html code visible in Firefox, since there is no send/post button
I assume, an arrow in upper right corner should replace this button (not easy or user-friendly solution)

[SGaist]

@darius Can't reproduce that on Firefox on macOS, the Submit combo is sitting there on the far right.

[darius]

@SGaist thank you. I use upper right arrow on blue background to send this reply.
Thank you for your time.

[KzR69100]

And for my problem ? :p

[mrjj]

@KzR69100

So what u want is

RGB value, ImageName, Cost

So for a given RGB value, u want to look up ImageName, and Cost?

How many of those looks up will you need?
If only 10 or 15 , then a DB might be a bit overkill.

Do you need it to be dynamic or could it be 100% predefined?

[KzR69100]

""""So for a given RGB value, u want to look up ImageName, and Cost?"""

Yes exactly,

i got 10 pictures who got 1 colors and 5 - 6 pictures who got 2 colors (if 2 squares beside equal got the same color as the picture who got 2 colors, so i will do 2 square = 1 picture)

but the principal is the 10 picture who got 1 color.

It will be all predefined no dynamic

[SGaist]

Which size should these picture be ?

[mrjj]

@KzR69100
Hi
You can make such small number very compact in code.
Add the images to a qres file and store name as :/imagename and
you can get a pixmap directly from it. ( as in Pixmap p(":/img");
Sample code. very basic but could be enough for your case.

struct CostInfo {
  QString ImageName;
  int Cost;
};

QMap<QRgb, CostInfo > Costs = {
  { QColor(255, 0, 120).rgb(), { ":/imageinres", 10 }},
  { QColor(110, 255, 110).rgb(), { "xxxx", 20 }},
  { QColor(120, 255, 20).rgb(), { "xxxx", 30 }},
  { QColor(130, 255, 90).rgb(), { "xxxx", 40 }},
  { QColor(140, 255, 10).rgb(), { "xxxx", 50 }},
  { QColor(100, 100, 100).rgb(), { "MEEEE", 60 }},
  { QColor(110, 255, 40).rgb(), { "xxxx", 70 }},
  { QColor(210, 255, 50).rgb(), { "xxxx", 80 }},
  { QColor(30, 255, 60).rgb(), { "xxxx", 3310 }},
  { QColor(20, 255, 70).rgb(), { "xxxx", 4410 }},
  { QColor(40, 255, 80).rgb(), { "xxx", 150 }},
  { QColor(50, 255, 90).rgb(), { "xxx", 160 }}
};


void Test() {
  QColor col = QColor(100, 100, 100); // getColor()..
  if (Costs.contains( col.rgb() )) {
    CostInfo& ci = Costs[col.rgb()];
    qDebug() << "found:" << "cost:" << ci.Cost << "img:" << ci.ImageName;
  }
}

Running test() gives
found: cost: 60 img: "MEEEE"

[KzR69100]

@SGaist i don't know it depends as i said, but in all case i think it will contain like 50 squares.

@mrjj Thanks for your help.
I don't understand the " QMap<QRgb, CostInfo > Costs "

and my problem i think, it's if i got a QColor(105,4,85) there will be a problem because it will not found a QColor who corresponds.

So i thought use a "for" to take a value range, and have all possible color, that's correct ?

[mrjj]

• I don't understand the " QMap<QRgb, CostInfo > Costs "
  Its a associative list. Using QRgb ( the color ) as key and it returns a Costs struct that is the
  data associated with that key.
  Read about it here
  http://doc.qt.io/qt-5/qmap.html
  Its a lookup list so to speak.

• and my problem i think, it's if i got a QColor(105,4,85) there will be a problem because it will not found a QColor who corresponds.

Well if not in list, { QColor(105,4,85).rgb(), { "xxxx", 50 }},
then nothing happens as you test with
if (Costs.contains( col.rgb() )) { << test if found
xxxonly do if foundxxx

[KzR69100]

@mrjj
So if nothing happens that's bad :p

What do you think about use a "for" ?

Like i don't care if it's a dark red, or a simple red etc..

My question is :

If nothing if found, how function can i use to find the "closer" color to the define color in my struct ?

thanks

[mrjj]

• If nothing if found, how function can i use to find the "closer" color to the define color in my struct ?

Hi
use the QMapIterator instead of "for"

QMapIterator<QString, int> i(map);
while (i.hasNext()) {
i.next();
cout << i.key() << ": " << i.value() << endl;
}
http://doc.qt.io/qt-5/qmap.html#details

That allows you to go over all and get the keys. (i.key())
QColor TheColor(i.key())
Then you can calculate if the RGB values for TheColor is
close enough for you to accept it.
For inspiration see here
http://stackoverflow.com/questions/9018016/how-to-compare-two-colors

int diffRed   = Math.abs(c1.getRed()   - c2.getRed());
int diffGreen = Math.abs(c1.getGreen() - c2.getGreen());
int diffBlue  = Math.abs(c1.getBlue()  - c2.getBlue());
Those values you can just divide by the amount of difference saturations (255), and you will get the difference between the two.

float pctDiffRed   = (float)diffRed   / 255;
float pctDiffGreen = (float)diffGreen / 255;
float pctDiffBlue   = (float)diffBlue  / 255;
After which you can just find the average color difference in percentage.

(pctDiffRed + pctDiffGreen + pctDiffBlue) / 3 * 100