praktika-cpp-2PO07/4/Unit1.cpp

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

#include <vcl.h>
#pragma hdrstop
#include <math.h>
#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
const int S = 60; //<2F><><EFBFBD>-<2D><> <20><><EFBFBD><EFBFBD><EFBFBD>
const int N = 60; //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
const float L = 0.5; //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
const int U = 5; //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
float a[N];
int colormode;
bool bl = true;
int r=0,g=255,b=128;
int mode = 0;
float x,  y,  tx,  ty,  k,  d,  len;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{

}
void color() {
   if(mode==0) {
      r--;
      if(r<=30) mode++;
   }else if(mode==1) {
      g++;
      if(g>=255) mode++;
   }else if(mode==2) {
      b++;
      if(b>=255) mode++;
   }else if(mode==3) {
      r--; g--;
      if(r<=30 || g<=30) mode++;
   }else if(mode==4) {
      g++; b--;
      if(g>=255 || b<=30) {
         mode=0;
      }
   }//else
}
//---------------------------------------------------------------------------
float frand() {
    randomize();
    return (float) ((float)random(100)/100);
}
void __fastcall TForm1::FormPaint(TObject *Sender)
{
    int width = ClientWidth;
    int height = ClientHeight;
    if (width > height) {
       len = (float) (height / L / N);
    } else {
       len = (float) (width / L / N);
    }
    randomize();
    if(random(4)==2) colormode = random(12);
    //<2F><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD>
    color();
    //<2F><><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    TRect aRect = Rect(0,0,ClientWidth,ClientHeight);
    Canvas->Brush->Color=(TColor) 0;//random(0xffffff);
    Canvas->FillRect(aRect);
    Canvas->Pen->Color=(TColor) RGB(r,g,b);//random(0x999999)+0x444444;
    //<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
    k = (float) (abs(frand() * 360) * M_PI / 180);
    float r50 = (float) (abs(frand() * 50));
    d = (float) (M_PI * 2 / S);
    if (r50 < 2) {
        k = (float) (abs(frand() * 1440) * M_PI / 180);
    }
    a[0] = (float) (a[0] + sin(k)/U);
    for(int i = 1; i<N; i++) {
        a[i] = (float) (a[i]+(a[i-1]-a[i])*0.1);
    }
    for(int j = 0; j<S; j++) {
        x = (float) (0.5 * width);
        y = (float) (0.5 * height);
        for(int i = 1; i<N; i++) {
           tx = (float) (x + sin(j*d+a[i])*len);
           ty = (float) (y + cos(j*d+a[i])*len);
           switch(colormode) {
                    case 0: Canvas->Pen->Color=(TColor)RGB((255 - 255 * i / N), 255 * i / N, 0); break;
                    case 1: Canvas->Pen->Color=(TColor)RGB(b, 255, (255 - 255 * i / N));   break;
                    case 2: Canvas->Pen->Color=(TColor)RGB(255, (255 - 255 * i / N), 0); break;
                    case 3: Canvas->Pen->Color=(TColor)RGB(r, (255 - 255 * i / N), 255); break;
                    case 4: Canvas->Pen->Color=(TColor)RGB((255 - 255 * i / N), 255, 0); break;
                    case 5: Canvas->Pen->Color=(TColor)RGB((255 - 255 * i / N), (255 - 255 * i / N), 255); break;
                    case 6: Canvas->Pen->Color=(TColor)RGB((255 - 255 * i / N), 255, 255); break;
                    case 7: Canvas->Pen->Color=(TColor)RGB(0, 255, (255 - 255 * i / N)); break;
                    case 8: Canvas->Pen->Color=(TColor)RGB(255, g, (255 - 255 * i / N)); break;
                    case 9: Canvas->Pen->Color=(TColor)RGB(255, (255 - 255 * i / N), (255 - 255 * i / N)); break;
                    case 10: Canvas->Pen->Color=(TColor)RGB(r, (255 - 255 * i / N), 0);  break;
                    case 11: Canvas->Pen->Color=(TColor)RGB(255, (255 - 255 * i / N), 255);  break;
                    case 12: Canvas->Pen->Color=(TColor)RGB((255 - 255 * i / N), 0, 255);  break;
                }

                //Canvas->Brush->Color=Canvas->Pen->Color;
                //Canvas->FillRect(Rect(x,y,tx,ty));
           //Canvas->Arc(x,y,tx,ty,x+ty,y+tx,x+tx,y+ty);
           //Canvas->Ellipse(x,y,x+tx,y+ty);
           Canvas->MoveTo(x,y);
           Canvas->LineTo(x=tx,y=ty);
        }
    }
    //<2F><><EFBFBD><EFBFBD><EFBFBD>
    Sleep(50);
    if(!bl) FormPaint(this);
}
//-------------------------------------------------------------------------

void __fastcall TForm1::FormMouseUp(TObject *Sender, TMouseButton Button,
      TShiftState Shift, int X, int Y)
{
      bl = !bl;
      FormPaint(this);
}
//---------------------------------------------------------------------------

void __fastcall TForm1::FormMouseDown(TObject *Sender, TMouseButton Button,
      TShiftState Shift, int X, int Y)
{
      /*bl = !b1;
      FormPaint(this);  */
}
//---------------------------------------------------------------------------