?? chap24.htm
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<p><small><a href="../../../index.htm">首頁</a> >> <a href="../../program.htm">程序設計</a>
>> <a href="../cbuilder.htm">C++ Builder</a> >> </small>圖形程式設計基本觀念·范例叁</p>
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<p><font SIZE="2" color="#FF0000">·范例叁</font></p>
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<p>除了以上兩個范例之外，我再為你示范兩個同樣使用簡單的畫線函式的繪圖范例，不過細節我就不再詳述了，另外因為它的關鍵部份程式很短，為了避免你來回讀取檔案交互參考的困擾，我還是把它列出來，你可以嘗試著修改其中的參數，說不定可以產生更為美觀的圖形呢!</p>
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<p><font SIZE="2">范例叁的輸出</font></p>
<p><font SIZE="2"><img SRC="Image3.gif" WIDTH="458" HEIGHT="344">圖03</font></p>
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<p>void __fastcall TForm1::FormPaint(TObject *Sender)</p>
<p>{</p>
<p> double A,x1,y1,x2,y2;</p>
<p> int D=100;</p>
<p> double E;</p>
<p> for (int i=0; i<720; i++)</p>
<p> {</p>
<p> A = i*M_PI/360;</p>
<p> E = D*(1+sin(4*A));</p>
<p> x1 = 320+E*cos(A);</p>
<p> x2 = 320+E*cos(A+M_PI/5);</p>
<p> y1 = 240+E*sin(A);</p>
<p> y2 = 240+E*sin(A+M_PI/5);</p>
<p> Canvas->MoveTo(x1,y1);</p>
<p> Canvas->LineTo(x2,y2);</p>
<p> }</p>
<p>}</p>
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<p><small><a href="../../../index.htm">首頁</a> >> <a href="../../program.htm">程序設計</a>
>> <a href="../cbuilder.htm">C++ Builder</a> >> </small>圖形程式設計基本觀念·范例叁</p>
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