image::crop

Dandruff · 08-12-2011 04:43 AM

Can someone shed some light on what each argument of image::crop takes in?

Code:

Image& crop                (Image &dest, Int x, Int y, Int w, Int h                                    ); // crop   image !! returns 'dest'

I don't really know which arguments to pass over to the function. Eg: Does x and y = x and y of a point in the image and w and h is another point in the image and together they make a square, the cropped picture?

Rofar · 08-12-2011 11:58 PM

I would guess that x and y is the origin for the rectangle area you want to crop. w and h would be the width and height of the rectangle.

**Esenthel** · 08-13-2011 04:08 PM

yes

Dandruff · 08-13-2011 10:58 PM

Great, works perfectly, thanks

fatcoder · 02-05-2012 04:49 AM

Hey guys, I can't seem to get this to work. I notice the crop() function has changed a bit so perhaps I'm using it wrong. Here's what I'm doing.

Code:

bigImage.crop(smallImage, 10, 10, 0, 110, 110, 0);

I was expecting smallImage to contain the cropped version of bigImage... but it does nothing, smallImage is blank. I must be missing something. Do both images need to be locked first or only one of them... I've tried both? What should z and d be set to... I've tried 0 and 1.

**Esenthel** · 02-06-2012 12:55 PM

no manual locking
please set z=0 and d=1

Mardok · 05-30-2012 05:34 PM

Hi, check my sample based on EE tutorial (Image.cpp) (Just copy and paste it.) and tell me why Image::crop() doesn't work ?

Why image2 is black?

When i did export [image2] to (PNG) content is correct. So why i can't draw it ?

Code:

/******************************************************************************/

#include "stdafx.h"

/******************************************************************************/

Image image, image2; // image object

/******************************************************************************/

void InitPre()

{

   App.name("Image");

   Paks.add("../data/engine.pak");

}

/******************************************************************************/

Bool Init()

{

   image.load("../data/particle/star.gfx"); // load image from file

   image.crop(image2, 0,0,0, 64,64,1);

   return true;

}

/******************************************************************************/

void Shut()

{

}

/******************************************************************************/

Bool Update()

{

   if(Kb.bp(KB_ESC))return false;

   if(Kb.bp(KB_S))image2.ExportPNG("LocalData/image2.png");

   return true;

}

/******************************************************************************/

void Draw()

{

   D.clear(BLUE);

   TextDS tds;

   D.text(tds, 0,0.7,S+"Press S to export LocalData/image2.png");

   // draw image

   image.draw(Rect(-1.0f, -1.0f, 0.5f, 0.5f)); // draw at given rectangle

   image2.draw(Rect(0.0f, 0.0f, 0.5f, 0.5f));

}

/******************************************************************************/

Mardok · 06-01-2012 04:33 PM

bump! nobody ? :(

Dwight · 06-02-2012 11:44 AM

The only problem could be is that the .gfx was exported in the wrong format and does not support an alpha channel.

What about loading the .png file?

Mardok · 06-02-2012 12:07 PM

omg my fault xD sory for confusion

Code:

image.Import("../Data/Gfx/landscape.png", IMAGE_B8G8R8A8, IMAGE_2D );

**Esenthel** · 06-02-2012 01:49 PM

Thanks,
there is an error in the crop method which may result in output image being of IMAGE_SOFT and not the original IMAGE_MODE.
I will fix it for next SDK

veksha · 07-06-2023 11:45 PM

hi. was this fixed? i guess not.

image::crop
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