(C++ CLX) TImage

Component for doing graphics.

?Example of low-level graphics

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 <memory>

include <ExtCtrls.hpp>


class NewImage
{
  public:
  NewImage(TCanvas * canvas) : mCanvas(canvas) {}
  void draw() const
  {
    std::auto_ptr<TImage> pImage(new TImage(0));
    pImage->Picture->LoadFromFile("32x32.bmp"); //Loading a bitmap
    pImage->AutoSize = true; //Do not forget this one!
    pImage->Picture->Bitmap->Width = random(256); //Random width
    pImage->Picture->Bitmap->Height = random(256); //Random height
    for (int y=0; y != pImage->Picture->Bitmap->Height; ++y)
    {
      unsigned char * pLine=static_cast<unsigned char *>(pImage->Picture->Bitmap->ScanLine[y]);
      for (int x=0; x<pImage->Picture->Bitmap->Width; ++x)
      {
        pLine[x*3+0]= 0; //Blue
        pLine[x*3+1]= 0; //Green
        pLine[x*3+2]= random(256); //Red
      }
    }
    mCanvas->Draw(0,0,pImage->Picture->Graphic); //Drawing it
  }
  private:
  TCanvas * mCanvas;
};

Code links

'TImage' links

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

last edited (November 11, 2006) by bilderbikkel, Number of views: 1577, Current Rev: 3 (Diff)

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