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Asked: 2020-12-18T10:10:38+00:00

Scaling the bmp image in the terminal.

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hello everyone, although i am a programmer with experience, but i really do not understand why simple functions for scaling images are not made, maybe
I don’t know something?

for example, there is a bmp image connected as a resource with a size of 500×500 pixels, you need to scale it to an arbitrary scale, for example to
200×200 and increase by 1000×1000 (but the size will change constantly, so the option to prepare several sizes at once is not suitable.

Give me a magic pendel to keep me digging in the right direction. canvas to disassemble or can there be ready-made library solutions in the
public domain, where there is already the necessary functionality? 

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    6 Answers

    1. dken

      dken

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      Nikolai Semko:

      In such cases, I use a simpler solution ( on the advice of fxsaber):

      oh thanks, I’m not so good at the nuances of oop. I’ll know now. I didn’t think that overriding protected is allowed. In C++, you can
      no longer use such techniques. (Visual c++ from version 11 is)

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    2. nikolay7ko

      nikolay7ko

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      Alexandr Gavrilin:

      The solution is working, adapted for mt4. Thank you. In mt4, there is no arrayswap function , so I added it in the standard canvas and had to m_pixels
      make it public. It is bad that initially no function was added that allows you to directly access this variable by index, only
      by x, y. But this can be solved simply by creating your own class with a similar name.

      In such cases, I use a simpler solution ( on the advice of fxsaber):

      #define protected public
      #include
      #undef protected

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    3. trendhunter

      trendhunter

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      Alexandr Gavrilin:

      The solution is working, adapted for mt4. Thank you. In mt4, there is no arrayswap function , so I added it in the standard canvas and had to m_pixels
      make it public. It is bad that initially no function was added that allows you to directly access this variable by index, only
      by x, y. But this can be solved simply by creating your own class with a similar name.

      Can’t this inclusion be made a resource?

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    4. dken

      dken

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      Nikolai Semko:

      it’s A pity you can’t put likes here! Thank you so much, really cool solution and easy to use. Why don’t you put copyrights in the code
      ? 

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    5. nikolay7ko

      nikolay7ko

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      Alexandr Gavrilin:

      Hello everyone, although I am a programmer with experience, but I really do not understand why simple functions for scaling images are not made,
      maybe i don’t know something?

      for example, there is a bmp image connected as a resource with a size of 500×500 pixels, you need to scale it to an arbitrary scale, for example to
      200×200 and increase by 1000×1000 (but the size will change constantly, so the option to prepare several sizes at once is not
      fits.

      Give me a magic pendel to keep me digging in the right direction. Canvas parse or can have ready-made librariesreferences
      in the public domain, where there is already the necessary functionality? 

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    6. alexeyvik

      alexeyvik

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      Alexandr Gavrilin:

      Hello everyone, although I am a programmer with experience, but I really do not understand why simple functions for scaling images are not made,
      maybe i don’t know something?

      for example, there is a bmp image connected as a resource with a size of 500×500 pixels, you need to scale it to an arbitrary scale, for example to
      200×200 and increase by 1000×1000 (but the size will change constantly, so the option to prepare several sizes at once is not
      fits.

      Give me a magic pendel to keep me digging in the right direction. Canvas parse or can have ready-made librariesreferences
      in the public domain, where there is already the necessary functionality? 

      Digging in … they won’t lead to anything. not even all image editors can do this, and you want it from mql…

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