page.cpp

C++ Builder 6 编程实例教程-北京希望电子出版社出版

//---------------------------------------------------------------------------
#include <vcl.h>
#pragma hdrstop
#include "math.h"
#include "Page.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
        : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Image1Click(TObject *Sender)
{
float x1;
float y1;
float x2;
float y2;
float n;
//定义变量
x1=0;
y1=(Form1->Image1->Left+Form1->Image1->Width)/4;
x2=x1;
y2=y1;
Form1->Image1->Canvas->MoveTo((x2),(y2));
//定义绘图起始点
n=0;
while (n<3.1415926*6)
      {
      x2=x2+3.1415926/12;
      y2=y1-40*sin(n);
      Form1->Image1->Canvas->LineTo((x2),(y2));
      //绘制正弦曲线
      n=n+3.1415926/180;
      }
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Image2Click(TObject *Sender)
{
float x1;
float y1;
float x2;
float y2;
float n;
//定义变量
x1=0;
y1=(Form1->Image2->Left+Form1->Image2->Width)/4;
x2=x1;
y2=y1;
Form1->Image2->Canvas->MoveTo((x2),(y2));
//定义绘图起始点
n=0;
while (n<3.1415926*6)
      {
      x2=x2+3.1415926/12;
      y2=y1-40*cos(n);
      Form1->Image2->Canvas->LineTo((x2),(y2));
      //绘制正弦曲线
      n=n+3.1415926/180;
      }
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Image3Click(TObject *Sender)
{
float x1;
float y1;
float x2;
float y2;
float n;
//定义变量
x1=0;
y1=(Form1->Image3->Left+Form1->Image3->Width)/4;
x2=x1;
y2=y1;
Form1->Image3->Canvas->MoveTo((x2),(y2));
//定义绘图起始点
n=0;
while (n<3.1415926*2)
      {
      x2=x2+3.1415926/3;
      if (abs(cos(n))<0.000001)
         {
          y2=y1-30*sin(n)/cos(n);
          Form1->Image3->Canvas->LineTo((x2),(y2));
          //绘制正切曲线
         }
       n=n+3.1415926/180;
       }
}
//---------------------------------------------------------------------------
void __fastcall TForm1::Image4Click(TObject *Sender)
{
float x1;
float y1;
float x2;
float y2;
float n;
//定义变量
x1=0;
y1=(Form1->Image4->Left+Form1->Image4->Width)/4;
x2=x1;
y2=y1;
Form1->Image4->Canvas->MoveTo((x2),(y2));
//绘图起始点
n=3.1415926;
while (n<3.1415926*3)
      {
      x2=x2+3.1415926/3;
      if (abs(sin(n))<0.00001)
         {
         y2=y1-30*cos(n)/sin(n);
         Form1->Image4->Canvas->LineTo((x2),(y2));
         //绘制余切曲线
         }
      n=n+3.1415926/180;
      }
}
//---------------------------------------------------------------------------

void __fastcall TForm1::FormCreate(TObject *Sender)
{
Form1->Image1->Canvas->Pen->Width=5;
Form1->Image2->Canvas->Pen->Width=5;
Form1->Image3->Canvas->Pen->Width=5;
Form1->Image4->Canvas->Pen->Width=5;
//设置画笔大小
Form1->Image1->Transparent=true;
Form1->Image2->Transparent=true;
Form1->Image3->Transparent=true;
Form1->Image4->Transparent=true;
//设置四个控件具有透明色
ShowMessage("在多页控件中央单击鼠标左键显示图形！");
}
//---------------------------------------------------------------------------