//
// Programme d'accompagnement de l'ouvrage 
// "C++ Builder 3"
// Gérard Leblanc 
// Editions Eyrolles, 1998
//

//---------------------------------------------------------------------------
#include <vcl\vcl.h>
#pragma hdrstop
#include <stdlib.h>
#include "AnimFP.h"
//---------------------------------------------------------------------------
#pragma resource "*.dfm"


#define N 5

TFP *FP;
Graphics::TBitmap *ImageFond, *Mask1, *Mask2;
int FenW, FenH, MaskW, MaskH;
struct
{
 int x, y, dx, dy;
} Pos[N];
//---------------------------------------------------------------------------
__fastcall TFP::TFP(TComponent* Owner)
	: TForm(Owner)
{
 // Charger l'image de fond
 ImageFond = new Graphics::TBitmap();
 ImageFond->LoadFromResourceName((int)HInstance, "Fond");
 Mask1 = new Graphics::TBitmap();
 Mask1->LoadFromResourceName((int)HInstance, "Msk1");
 MaskW = Mask1->Width; MaskH = Mask1->Height;
 Mask2 = new Graphics::TBitmap();
 Mask2->LoadFromResourceName((int)HInstance, "Msk2");
 randomize();
}
__fastcall TFP::~TFP()
{
 delete ImageFond, Mask1, Mask2;
}
//---------------------------------------------------------------------------
void __fastcall TFP::FormCreate(TObject *Sender)
{
 ClientWidth = ImageFond->Width; FenW = ClientWidth;
 ClientHeight = ImageFond->Height; FenH = ClientHeight;
 for (int i=0; i<N; i++)
 {
  Pos[i].x = random(FenW-MaskW); Pos[i].y = random(FenH-MaskH);
  Pos[i].dx = random(2) ? -2 : 2;
  Pos[i].dy = random(2) ? -2 : 2;
  int Vitesse = 1 + random(3);
  Pos[i].dx *= Vitesse; Pos[i].dy *= Vitesse;
 }

}
//---------------------------------------------------------------------------
void __fastcall TFP::TimerTimer(TObject *Sender)
{
 Fond->Canvas->CopyMode = cmSrcCopy;
 Fond->Picture->Bitmap = ImageFond;
 for (int i=0; i<N; i++)
 {
  Fond->Canvas->CopyMode = cmSrcAnd;
  Fond->Canvas->Draw(Pos[i].x, Pos[i].y, Mask1);
  Fond->Canvas->CopyMode = cmSrcPaint;
  Fond->Canvas->Draw(Pos[i].x, Pos[i].y, Mask2);
  Pos[i].x += Pos[i].dx;
  Pos[i].y += Pos[i].dy;
  if (Pos[i].x<0 || Pos[i].x+MaskW>FenW) Pos[i].dx *= -1;
  if (Pos[i].y<0 || Pos[i].y+MaskH>FenH) Pos[i].dy *= -1;
 }
}
//---------------------------------------------------------------------------