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<title>第六章：輸入（三）</title>
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<td width="100%"><font size="3" color="#8000FF"><strong><em>第六章：輸入（三）</em></strong></font></td>
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<td width="100%" style="background-color: rgb(232,255,254)"><font FACE="宋體" SIZE="3"><p ALIGN="JUSTIFY">在下面的小程序中，我們通過三個滾動條分別代表</font><font SIZE="3">R</font><font FACE="宋體" SIZE="3">、</font><font SIZE="3">G</font><font FACE="宋體" SIZE="3">、</font><font SIZE="3">B</font><font FACE="宋體" SIZE="3">，滾動滾動條，將在右邊的圖片框中顯示相應的顏色，并且在下面的文本框中顯示顏色的十六進制數值。</p>
<p ALIGN="JUSTIFY">現在，新建一個項目文件，在</font><font SIZE="3">Form1</font><font FACE="宋體" SIZE="3">中如圖</font><font SIZE="3">6</font><font FACE="宋體" SIZE="3">－</font><font SIZE="3">12</font><font FACE="宋體" SIZE="3">布局控件，各控件屬性如下表：</font></p>
<p ALIGN="JUSTIFY"><img src="0612.gif" alt="0612.gif (3568 字節)" WIDTH="345" HEIGHT="267"></p>
<table BORDER="1" CELLSPACING="1" CELLPADDING="7" WIDTH="379">
<tr>
<td WIDTH="46%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">HsrollBar</font></td>
<td WIDTH="54%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Name Hscroll1</p>
<p ALIGN="JUSTIFY">Index 0</font><font FACE="宋體" SIZE="3">、</font><font SIZE="3">1</font><font FACE="宋體" SIZE="3">、</font><font SIZE="3">2</p>
</font><font FACE="宋體" SIZE="3"><p ALIGN="JUSTIFY">（共同屬性）</p>
</font><font SIZE="3"><p ALIGN="JUSTIFY">Max 255</p>
<p ALIGN="JUSTIFY">Min 0</p>
<p ALIGN="JUSTIFY">LargeChange 10</p>
<p ALIGN="JUSTIFY">SmallChange 1</font></td>
</tr>
<tr>
<td WIDTH="46%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Label</font></td>
<td WIDTH="54%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Name Label1</p>
<p ALIGN="JUSTIFY">Index 0</font><font FACE="宋體" SIZE="3">、</font><font SIZE="3">1</font><font FACE="宋體" SIZE="3">、</font><font SIZE="3">2</p>
<p ALIGN="JUSTIFY">Index 0 Caption </font><font FACE="宋體" SIZE="3">“紅：”</font><font SIZE="3"> </p>
<p ALIGN="JUSTIFY">Index 1 Caption </font><font FACE="宋體" SIZE="3">“綠：”</p>
</font><font SIZE="3"><p ALIGN="JUSTIFY">Index 2 Caption </font><font FACE="宋體" SIZE="3">“藍：”</font></td>
</tr>
<tr>
<td WIDTH="46%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Label</font></td>
<td WIDTH="54%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Name Label2</p>
<p ALIGN="JUSTIFY">Caption </font><font FACE="宋體" SIZE="3">“顏色值”</font></td>
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<td WIDTH="46%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">TextBox</font></td>
<td WIDTH="54%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Name Text1</p>
<p ALIGN="JUSTIFY">Text </font><font FACE="宋體" SIZE="3">“”</font></td>
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<td WIDTH="46%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">PictureBox</font></td>
<td WIDTH="54%" VALIGN="TOP"><font SIZE="3"><p ALIGN="JUSTIFY">Name Picuture1</font></td>
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<p><font FACE="宋體" SIZE="3"> </p>
<p ALIGN="JUSTIFY">為了把十進制數值換成十六進制數值，要使用一個叫做</font><font SIZE="3">Hex</font><font FACE="宋體" SIZE="3">（）的函數，它把十進制數值轉化為十六進制的字符，但對于只有一位的十六進制字符，這個函數并不在高位補零，為了視覺上的正確，我設計了一個小函數幫助它給一位的十六進制字符補零</font><font SIZE="3">.</font><font FACE="宋體" SIZE="3"></p>
<p ALIGN="JUSTIFY">程序代碼很簡單，見下：</font><font SIZE="3"></p>
<p ALIGN="JUSTIFY"></font><em><strong><font color="#004080" SIZE="3">Dim RedStr, GreenStr,
BlueStr As String</font><font color="#008000"><font SIZE="3">’RGB</font><font FACE="宋體" SIZE="3">的字符</font></font><font color="#004080"><br>
</font><font color="#004080" SIZE="3">Dim RedNum, GreenNum, BlueNum As Integer</font><font color="#008000" SIZE="3">’RGB</font><font FACE="宋體" SIZE="3" color="#008000">的數值</font></strong></em><font SIZE="3"></p>
</font><font FACE="宋體" SIZE="3"><p ALIGN="JUSTIFY"></font><font SIZE="3"> </p>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">Function GetColorValue() As String</font></strong></em></p>
<blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#008040"><font SIZE="3">‘</font><font FACE="宋體" SIZE="3">獲得輸入值</font></font><br>
<font color="#004080">RedNum = HScroll1(0).Value<br>
GreenNum = HScroll1(1).Value<br>
BlueNum = HScroll1(2).Value</font></strong></em></p>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">RedStr = Hex(RedNum)</font><br>
<font color="#004080" SIZE="3">If Len(RedStr) < 2 Then RedStr = "0" + RedStr</font><font color="#008040"><font SIZE="3">’</font><font FACE="宋體" SIZE="3">補零</font></font></strong></em></p>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">GreenStr = Hex(GreenNum)<br>
If Len(GreenStr) < 2 Then GreenStr = "0" + GreenStr</font></strong></em></p>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">BlueStr = Hex(BlueNum)<br>
If Len(BlueStr) < 2 Then BlueStr = "0" + BlueStr</font></strong></em></p>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080" SIZE="3">GetColorValue = RedStr +
GreenStr + BlueStr</font><font color="#008040"><font SIZE="3">’</font><font FACE="宋體" SIZE="3">合并</font></font></strong></em></p>
</blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">End Function</font></strong></em></p>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">Private Sub Form_Load()</font></strong></em></p>
<blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#008040" SIZE="3">‘</font><font FACE="宋體" SIZE="3" color="#008040">初始化程序</font><br>
<font color="#004080">Text1.Text = GetColorValue<br>
Picture1.BackColor = RGB(RedNum, GreenNum, BlueNum)</font><font color="#008040">'RGB函數返回顏色值</font></strong></em></p>
</blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">End Sub</font></strong></em></p>
<p ALIGN="JUSTIFY"> </p>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">Private Sub HScroll1_Change(Index As
Integer)</font></strong></em></p>
<blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#008000" SIZE="3">‘</font><font FACE="宋體" SIZE="3" color="#008000">當滾動條被改變時</font><br>
<font color="#004080">Text1.Text = GetColorValue<br>
Picture1.BackColor = RGB(RedNum, GreenNum, BlueNum)</font></strong></em></p>
</blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">End Sub</font></strong></em></font><font FACE="宋體" SIZE="3"></p>
<p ALIGN="JUSTIFY">運行如圖</font><font SIZE="3">6</font><font FACE="宋體" SIZE="3">－</font><font SIZE="3">13</font><font FACE="宋體" SIZE="3">。</p>
<p ALIGN="JUSTIFY"><img src="0613.gif" alt="0613.gif (3820 字節)" WIDTH="345" HEIGHT="267"></font></td>
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