(C++ VCL) TImage

//Forward declaration
namespace Extctrls { class TImage; }
include <system.hpp>

Examples:

Creating a bitmap TImage dynamically

The problem of dyncamically creating a bitmap TImage is that I can only set it to a bitmap by loading a bitmap image!

Below is an example of a class that dynamically generates a bitmap TImage and draws it to a TCanvas it is initialized on.

include <cassert>

include <memory>

include <ExtCtrls.hpp>


class NewImage
{
  public:
  NewImage(TCanvas * canvas) 
    : mCanvas(canvas),
      mImage(new TImage(0)) 
  {
    assert(FileExists("1x1.bmp"))
    mImage->Picture->LoadFromFile("1x1.bmp"); //Loading a bitmap
    mImage->AutoSize = true; //Do not forget this one!
    mImage->Picture->Bitmap->Width = random(256); //Random width
    mImage->Picture->Bitmap->Height = random(256); //Random height
  }
  void draw() const
  {
    const int maxy = mImage->Picture->Bitmap->Height;
    const int maxx = mImage->Picture->Bitmap->Width;
    for (int y=0; y!=maxy; ++y)
    {
      unsigned char * pLine
        = static_cast<unsigned char *>(mImage->Picture->Bitmap->ScanLine[y]);
      for (int x=0; x!=maxx; ++x)
      {
        pLine[x*3+0]= 0; //Blue
        pLine[x*3+1]= 0; //Green
        pLine[x*3+2]= random(256); //Red
      }
    }
    mCanvas->Draw(0,0,mImage->Picture->Graphic); //Drawing it
  }
  private:
  TCanvas * mCanvas;
  std::auto_ptr<TImage> mImage;
};

Code links

'TImage' links

C++ CLX
C++ VCL
C++ Builder
Pascal CLX
Pascal VCL

last edited (December 18, 2006) by bilderbikkel, Number of views: 5169, Current Rev: 10 (Diff)

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