Create a bitmap and drawing in it?

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

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

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

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

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

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

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

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

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

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

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

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

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

THE POST BELOW IS MORE THAN 5 YEARS OLD. RELATED SUPPORT INFORMATION MIGHT BE OUTDATED OR DEPRECATED

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