Resize an image

[The BasheR]

Hi all, i would like to resize an image with Irrlicht but i don't know how to do
I've juste read this topic: http://irrlicht.sourceforge.net/phpBB2/ ... size+image
But istill don't know how to do

Acutally i would like to load an image, and to resize it to display it with the new size, but i don't want the image to be saved.

Is someone can tell me how to do?
Or if it is not possible with Irrlicht, can you tell me how to do generally?

Thanks a lot.

[LLDD]

Load a texture and use draw2dimage.
Example:

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SaveGameTexture=driver->getTexture("save005.bmp");
driver->draw2DImage(SaveGameTexture, rect<s32>(300,30,620,270), rect<s32>(0,0,640,480));

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[The BasheR]

Ok, but what does this method do exactly? I read the documentation for this method but i don't exactly understand the meaning of all the parameters

[LLDD]

Ok, but what does this method do exactly? I read the documentation for this method but i don't exactly understand the meaning of all the parameters

The first parameter is the texture you want to draw.
Second parameter is a rectangle on the screen where you want to draw the image.
Third parameter is a rectangle of the portion of your image that will be drawn.
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[The BasheR]

Ok thank, but i would like to use it with transparence so i use it like as following:

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mp_driver->draw2DImage(mp_image, mt_rect_dest[i],
            mt_rect[i], 0, SColor(255,255,255,255), true);

But i have this error:

"error: no matching function for call to `irr::video::IVideoDriver::draw2DImage(irr::video::ITexture*&, irr::core::rect<irr::s32>&, irr::core::rect<irr::s32>&, int, irr::video::SColor, bool)'"

So how can i do to use it with SColo and the boolean, but without having this error?

Thanks

[The BasheR]

Nobody can help me
Is it possible to resize an image AND use the transparency?

[Kuehrli]

I guess that this might be the function you are searching for:

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virtual void draw2DImage(video::ITexture* texture, const core::rect<s32>& destRect, const core::rect<s32>& sourceRect, const core::rect<s32>* clipRect = 0, video::SColor* colors=0, bool useAlphaChannelOfTexture=false) = 0;

So try something like this:

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SColor colors[4];
for(int i=0; i<4; ++i)
    colors[i] = SColor(100,255,255,255);
mp_driver->draw2DImage(mp_image, mt_rect_dest[i], mt_rect[i], 0, colors, true);

[The BasheR]

Thank you that is working, but what have we to initialize colors like this:

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SColor colors[4];
for(int i=0; i<4; ++i)
    colors[i] = SColor(100,255,255,255); 

[Robert Y.]

You can just use:

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mp_driver->draw2DImage(mp_image, mt_rect_dest[i], mt_rect[i], 0, SColor(100,255,255,255), true); 

where 100 is the alpha value and 255,255,255 tells Irrlicht to use the colors of the image without filtering.

[The BasheR]

ok but what is the difference between the 2 ways?

[hybrid]

Just read the API documentation for the function. You have to pass an array of four colors which are used as base colors for the four corners of the image. If you use only one color you will get a buffer overrun (which might give you wrong colors or simply a crash).

[Robert Y.]

Just read the API documentation for the function. You have to pass an array of four colors which are used as base colors for the four corners of the image. If you use only one color you will get a buffer overrun (which might give you wrong colors or simply a crash).

Now I'm confused too. In ivideodriver.h there is also a draw2dimage definition with one SColor. That works fine for me, or am I just lucky?

[hybrid]

There are also two methods which take only one SColor. But those mentioned in this thread are all the same and take an array of four SColors.

[The BasheR]

Ok, thank you for your answers.