Create a bitmap and drawing in it?

Helper

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On 29/04/2012 at 08:35, xxxxxxxx wrote:

Wouldn't you have to get the bitmap back out of GeClipMap? I seem to recall there's a 'GetBitmap()' function or something similar to retrieve the changed bitmap. Then you would save that.

Steve

Helper

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On 29/04/2012 at 11:17, xxxxxxxx wrote:

I have no idea Steve. This is not obvious stuff. At least not to me it isn't.
There's these two separate classes(BaseBitmap&GeClipmap). And each one has it's own strengths and limitations.
And to make things more confusing...There's no clear documentation in the docs showing how to make these two classes work together. To edit or create images with them.

Here's my latest attempt at loading an image. Then editing it with GeClipMap. Then saving it:

    Filename fn = GeGetC4DPath(C4D_PATH_DESKTOP)+"myimage.jpg"; //Get the path to an image  
  
  //Because we have to init first..Then get the image's info. We'll create a dummy BaseBitmap instance first  
  //This BaseBitmap instance will be used just to gather inforamtion about the file we've imported  
  AutoAlloc<BaseBitmap> file;                //Create a new BaseBitmap instance  
  file->Init(fn);                            //intialize it using the file path we used as the target image  
  LONG width = file->GetBw();                //Get the image's width  
  LONG height = file->GetBh();               //Get the image's height  
  LONG bitDepth = file->GetBt();             //Get the image's bitdepth  
  GePrint("Width: " + LongToString(width) + ", Height: " + LongToString(height) + ", BitDepth:  " + LongToString(bitDepth));  
  
  
  //Now we'll create another BaseBitmap...Based on the info we gathered from the previous BaseBitmap instance  
  //This is the one we'll edit and make changes to  
  AutoAlloc<BaseBitmap> bmp;           //Create a new image based on the file's info  
  bmp->Init(width, height,bitDepth);  
  file->CopyTo(bmp);                   //Copies the image's info over to this BaseBitmap instance  
  //bmp->Clear(255,255,255);           //Set the entire image to the color white if desired  
  bmp->SetPen(255,255,255);  
  bmp->Line(0,0,100,200);  
  
  AutoAlloc<GeClipMap> gcm;  
  if(!gcm) return FALSE;  
  gcm->Init(bmp);                       //Initialise the clip map using the BaseBitmap above so we can save it later on  
  gcm->BeginDraw();  
  gcm->SetColor(255, 0, 0);             //Sets the color of the text to red  
  gcm->FillRect(0,0,100,100);  
  gcm->EndDraw();  
  
  Filename newfn = GeGetC4DPath(C4D_PATH_DESKTOP)+"myimagenew.jpg"; //Create a path to save our new image  
  bmp->Save(Filename(newfn),FILTER_JPG,NULL,SAVEBIT_0);             //Save the new image

The result is a copy of the source image. With a rectangle drawn with some weird missing strips. And the wrong color(green)
But at least I'm getting something as a result.
I'm slowly getting there...But I'm doing a lot of fumbling around in the dark.

-ScottA

Helper

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On 30/04/2012 at 00:09, xxxxxxxx wrote:

Originally posted by xxxxxxxx

The result is a copy of the source image. With a rectangle drawn with some weird missing strips. And the wrong color(green)
But at least I'm getting something as a result.
I'm slowly getting there...But I'm doing a lot of fumbling around in the dark. !LOL[URL-REMOVED]

Yes because after drawing to the clipmap you need to get the modified bitmap with GetBitmap() (as said Steve above). The source bitmap isn't updated automatically.

  
  AutoAlloc<GeClipMap> gcm;  
  if(!gcm) return FALSE;  
  gcm->Init(bmp);                       //Initialise the clip map using the BaseBitmap above so we can save it later on  
  gcm->BeginDraw();  
  gcm->SetColor(255, 0, 0);             //Sets the color of the text to red  
  gcm->FillRect(0,0,100,100);  
  gcm->EndDraw();
  
    **BaseBitmap *clipBmp** _ **  = gcm->GetBitmap()    //Get modified bitmap from clipmap**_  
  
  Filename newfn = GeGetC4DPath(C4D_PATH_DESKTOP)+"myimagenew.jpg"; //Create a path to save our new image  
     clipBmp->Save(Filename(newfn),FILTER_JPG,NULL,SAVEBIT_0);             //Save the new image

EDIT: Fixed code.

[URL-REMOVED] @maxon: This section contained a non-resolving link which has been removed.

Helper

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On 30/04/2012 at 08:26, xxxxxxxx wrote:

It won't let me do this: bmp = gcm- >GetBitmap(); //error: cannot access private member AutoAlloc()

-ScottA

Helper

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On 30/04/2012 at 08:40, xxxxxxxx wrote:

Originally posted by xxxxxxxx

It won't let me do this: bmp = gcm- >GetBitmap(); //error: cannot access private member AutoAlloc()

Sorry, this is because bmp was already allocated with AutoAlloc(). We have to declare a new BaseBitmap variable to hold the modified bitmap:

BaseBitmap *clipBmp = gcm->GetBitmap();

Helper

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On 30/04/2012 at 09:16, xxxxxxxx wrote:

Sorry about that. I should have mentioned that I already tried assigning it to a new BaseBitmap variable like that.

The code you posted still produces a rectangle full of lines. And not the correct color for the FillRect().
An interesting thing to note is I got this same type of bad result when using SetPixelCnt() with the wrong buffer settings.

-ScottA

Helper

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On 30/04/2012 at 09:34, xxxxxxxx wrote:

Here is the code that works for me:

Filename fn = GeGetC4DPath(C4D_PATH_DESKTOP)+"myimage.jpg"; //Get the path to an image
  
AutoAlloc<GeClipMap> gcm;        //Create an instance of the GeClipMap class
gcm->Init(fn,0,0);               //Initialise it using the image in our path
  
gcm->BeginDraw();
    gcm->SetColor(255L,255L,255L);      //Set the color to white
    gcm->FillRect(50L,50L,100L,100L);   //Create a filled rectangle area
gcm->EndDraw();
  
ShowBitmap(gcm->GetBitmap());           //Show the drawn bitmap

Helper

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On 30/04/2012 at 10:05, xxxxxxxx wrote:

Now you've got it.

Here's my little addition to it that will also save the image as well as show it in the picture viewer:

    Filename fn = GeGetC4DPath(C4D_PATH_DESKTOP)+"myimage.jpg"; //Get the path to an image  
  AutoAlloc<GeClipMap> gcm;           //Create an instance of the GeClipMap class  
  gcm->Init(fn,0,0);                  //Initialise it using the image in our path  
  
  gcm->BeginDraw();  
  gcm->SetColor(255L,255L,255L);      //Set the color to white  
  gcm->FillRect(50L,50L,100L,100L);   //Create a filled rectangle area  
  gcm->EndDraw();  
  
  ShowBitmap(gcm->GetBitmap());       //Show the drawn bitmap in the picture viewer  
  
  BaseBitmap *clipBmp = gcm->GetBitmap();                         //Get the modified bitmap from GeClipMap  
  Filename newfn = GeGetC4DPath(C4D_PATH_DESKTOP)+"newimage.jpg"; //Create a path to save our new image  
  clipBmp->Save(Filename(newfn),FILTER_JPG,NULL,SAVEBIT_0);       //Save the new image

Please don't kill me.
But could you possibly show me how to write the PolyLine code?
It requires a GE_POINT2D struct pointer. And I can't figure out how to write that part.

-ScottA

Helper

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On 30/04/2012 at 12:20, xxxxxxxx wrote:

I've tried a whole bunch of different things. But I just can't get the struct to work.

Example#1

    GE_POINT2D *points;       //<--Error. Variable is not initialized!!  
                            //Setting it to NULL doesn't work  
  LONG x = points->x = 5;  
  LONG y = points->y = 25;  
  gcm->PolyLine(20, points);

Example#2
Accessing the struct directly without pointers crashes C4D

    GE_POINT2D points;   
  LONG x = points.x = 5;  
  LONG y = points.y = 25;  
  gcm->PolyLine(20, &points);

Can anyone tell me how to do this?
I've got all the parts and pieces. But I just can't make C4D happy.

-ScottA

Helper

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On 30/04/2012 at 15:04, xxxxxxxx wrote:

Hi,

You have to initialize an array of struct (GE_POINT2D in this case) :

GE_POINT2D points[] =       //Define an array of GE_POINT2D
{
    {200L,200L},      //x = 200L, y = 200L
    {250L,250L},      //etc.
    {200L,300L}
};
  
gcm->PolyLine(3, points);    //Draw the polyline with the given 3 points

This is a bit tricky at the beginning .

Helper

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On 30/04/2012 at 15:34, xxxxxxxx wrote:

Wonderful.
I think I've got everything I need now.
If not... too bad. Because I've bothered you enough about this.

Thanks a lot.
You've really helped me (and probably many others) out a great deal with this.

-ScottA