unit1.cpp

<<C++Builder 6实用编程100例>>随书光盘

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------


void __fastcall TForm1::Button1Click(TObject *Sender)
{
        if(OpenPictureDialog1->Execute())
        {
                Image1->Picture->LoadFromFile(OpenPictureDialog1->FileName);
                Button2->Enabled=true;
                Button3->Enabled=true;
        }
}
//---------------------------------------------------------------------------
//淡入
void __fastcall TForm1::Button2Click(TObject *Sender)
{
        Graphics::TBitmap* myBitmap1;
        myBitmap1=new Graphics::TBitmap;
        myBitmap1->Width=Image1->Width;
        myBitmap1->Height=Image1->Height;
        myBitmap1->Assign(Image1->Picture);
        Graphics::TBitmap* myBitmap2;
        myBitmap2=new Graphics::TBitmap;
        myBitmap2->Width=Image1->Width;
        myBitmap2->Height=Image1->Height;
        myBitmap2->Assign(Image1->Picture);
        int width,height;
        width=Image1->Width;
        height=Image1->Height;
        int k,i,j;
        RGBColor* ptr1;
        RGBColor* ptr2;
        for(k=0;k<256;k++)
        {
                for(i=0;i<height;i++)
                {
                        ptr1=(RGBColor*)myBitmap1->ScanLine[i];
                        ptr2=(RGBColor*)myBitmap2->ScanLine[i];
                        for(j=0;j<width;j++)
                        {
                                if((ptr2+j)->red>k)
                                        (ptr1+j)->red=k;
                                if((ptr2+j)->green>k)
                                        (ptr1+j)->green=k;
                                if((ptr2+j)->blue>k)
                                        (ptr1+j)->blue=k;
                        }
                }
                Form1->Canvas->Draw(18,18,myBitmap1);
                Application->ProcessMessages();
                Sleep(10);
        }
        delete myBitmap1;
        delete myBitmap2;
}
//---------------------------------------------------------------------------
//淡出
void __fastcall TForm1::Button3Click(TObject *Sender)
{
        Graphics::TBitmap* myBitmap;
        myBitmap=new Graphics::TBitmap;
        myBitmap->Width=Image1->Width;
        myBitmap->Height=Image1->Height;
        myBitmap->Assign(Image1->Picture);
        int width,height;
        width=Image1->Width;
        height=Image1->Height;
        int k,i,j;
        RGBColor* ptr;
        for(k=0;k<256;k++)
        {
                for(i=0;i<height;i++)
                {
                        ptr=(RGBColor*)myBitmap->ScanLine[i];
                        for(j=0;j<width;j++)
                        {
                                if((ptr+j)->red>0)
                                        (ptr+j)->red-=1;
                                if((ptr+j)->green>0)
                                        (ptr+j)->green-=1;
                                if((ptr+j)->blue>0)
                                        (ptr+j)->blue-=1;
                        }
                }
                Form1->Canvas->Draw(18,18,myBitmap);
                Application->ProcessMessages();  
                Sleep(10);
        }
        delete myBitmap;
}
//---------------------------------------------------------------------------