82 lines
2.3 KiB
C++
82 lines
2.3 KiB
C++
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//---------------------------------------------------------------------------
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#include <vcl.h>
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#include "Math.h"
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#pragma hdrstop
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#include "Unit1.h"
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//---------------------------------------------------------------------------
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#pragma package(smart_init)
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#pragma resource "*.dfm"
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TForm1 *Form1;
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//---------------------------------------------------------------------------
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__fastcall TForm1::TForm1(TComponent* Owner)
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: TForm(Owner)
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{
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}
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//---------------------------------------------------------------------------
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float function(int i) {
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return (0.1*sqrt(12*i)+log10(i+7));
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}
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int step = 15;
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void __fastcall TForm1::FormPaint(TObject *Sender)
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{
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int w2 = ClientWidth/2;
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int h2 = ClientHeight/2;
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TRect aRect = Rect(0,0,ClientWidth,ClientHeight);
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Canvas->Brush->Color=0xffffff;
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Canvas->FillRect(aRect);
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Canvas->Pen->Color=0x00;
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//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> OX
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Canvas->MoveTo(0,h2);
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Canvas->LineTo(ClientWidth,h2);
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Canvas->MoveTo(ClientWidth-10,h2-3);
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Canvas->LineTo(ClientWidth,h2);
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Canvas->LineTo(ClientWidth-10,h2+3);
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//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> OY
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Canvas->MoveTo(w2,0);
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Canvas->LineTo(w2,ClientHeight);
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Canvas->MoveTo(w2-3,10);
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Canvas->LineTo(w2,0);
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Canvas->LineTo(w2+3,10);
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//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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Canvas->MoveTo(w2+10+step,h2-2);
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Canvas->LineTo(w2+10+step,h2+2);
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Canvas->MoveTo(w2-2,h2-10-step);
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Canvas->LineTo(w2+2,h2-10-step);
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//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD> <20><><EFBFBD><EFBFBD>
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int ht = Canvas->TextHeight("0");
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int wt = Canvas->TextWidth("X");
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Canvas->TextOutA(w2+2,h2-ht,"0");
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Canvas->TextOutA(ClientWidth-12,h2-ht-2,"X");
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Canvas->TextOutA(w2+6,2,"Y");
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Canvas->TextOutA(w2+7+step,h2-ht,"1");
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Canvas->TextOutA(w2+2,h2-step-2*ht,"1");
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//<2F><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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Canvas->MoveTo(w2,h2+function(0));
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Canvas->Pen->Color=0x0000ff;
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for(int i=1; i<ClientWidth; i+=2) {
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Canvas->LineTo(i*step+w2,-function(i)*step+h2);
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}
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}
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//---------------------------------------------------------------------------
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void __fastcall TForm1::FormKeyDown(TObject *Sender, WORD &Key,
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TShiftState Shift)
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{
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if(((int)Key)==VK_LEFT) {
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step -= 10;
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FormPaint(this);
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}
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if(((int)Key)==VK_RIGHT) {
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step += 10;
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FormPaint(this);
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}
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}
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//---------------------------------------------------------------------------
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