請問ComboBox繪圖(圖形發生重疊)問題??? |
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尚未結案
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Vincent2424
一般會員   發表：57 回覆：40 積分：19 註冊：2004-12-15 發送簡訊給我 |
如果我使用矩形、圓形、正方形就可以正常切換到不同形狀，如下 void __fastcall TForm1::ComboBox1Change(TObject *Sender)
{ TRect r;
r.Top = 0;
r.Left = 0;
r.Right = ListBox1->Width;
r.Bottom = ListBox1->Height;
ListBox1->Canvas->FillRect(r); if (ComboBox1->Text == "矩形")
ListBox1->Canvas->Rectangle(10, 10, 300, 100); else if (ComboBox1->Text == "圓形")
ListBox1->Canvas->Ellipse(10, 10, 100, 100); else if (ComboBox1->Text == "Arc")
ListBox1->Canvas->Arc(10, 10, 30, 30, 40, 40, 50, 50); else if (ComboBox1->Text == "正方形")
ListBox1->Canvas->Rectangle(10, 10, 200, 200); } 但是如果我加入Line的話，切到line再切到回到其他(如圓形、正方形)，原本的line就不會消失，重疊到新圖上.....如下 void __fastcall TForm1::ComboBox1Change(TObject *Sender)
{ TRect r;
r.Top = 0;
r.Left = 0;
r.Right = ListBox1->Width;
r.Bottom = ListBox1->Height;
ListBox1->Canvas->FillRect(r); if (ComboBox1->Text == "矩形")
ListBox1->Canvas->Rectangle(10, 10, 300, 100); else if (ComboBox1->Text == "圓形")
ListBox1->Canvas->Ellipse(10, 10, 100, 100); else if (ComboBox1->Text == "Arc")
ListBox1->Canvas->Arc(10, 10, 30, 30, 40, 40, 50, 50); else if (ComboBox1->Text == "正方形")
ListBox1->Canvas->Rectangle(10, 10, 200, 200); else if (ComboBox1->Text == "Line")
//Upper surface
ListBox1->Canvas->MoveTo(0,75);
ListBox1->Canvas->LineTo(3.125,68.9);
ListBox1->Canvas->LineTo(6.25,66.525);
ListBox1->Canvas->LineTo(12.5,63.175);
ListBox1->Canvas->LineTo(18.75,60.6);
ListBox1->Canvas->LineTo(25 ,58.525);
ListBox1->Canvas->LineTo(37.5,55.275);
ListBox1->Canvas->LineTo(50 ,53);
ListBox1->Canvas->LineTo(62.5,51.475);
ListBox1->Canvas->LineTo(75 ,50.6); }
請問我該怎麼解決圖形重疊的問題呢
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jow
尊榮會員  發表：66 回覆：751 積分：1253 註冊：2002-03-13 發送簡訊給我 |
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jow
尊榮會員 發表：66 回覆：751 積分：1253 註冊：2002-03-13 發送簡訊給我 |
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Vincent2424
一般會員 發表：57 回覆：40 積分：19 註冊：2004-12-15 發送簡訊給我 |
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jow
尊榮會員 發表：66 回覆：751 積分：1253 註冊：2002-03-13 發送簡訊給我 |
建議將繪圖用的TListBox換成
TPaintBox(System Page下的項目).
void __fastcall TForm1::ComboBox1Change(TObject *Sender)
{
//Draw Background
PaintBox1->Canvas->Brush->Color = Color;
PaintBox1->Canvas->FillRect(PaintBox1->ClientRect); PaintBox1->Canvas->Pen->Color = clRed; if (ComboBox1->Text == "矩形")
PaintBox1->Canvas->Rectangle(10, 10, 300, 100);
else if (ComboBox1->Text == "圓形")
PaintBox1->Canvas->Ellipse(10, 10, 100, 100);
else if (ComboBox1->Text == "Arc")
PaintBox1->Canvas->Arc(10, 10, 30, 30, 40, 40, 50, 50);
else if (ComboBox1->Text == "正方形")
PaintBox1->Canvas->Rectangle(10, 10, 200, 200);
else if (ComboBox1->Text == "Line")
{
//Upper surface
PaintBox1->Canvas->MoveTo(0,75);
PaintBox1->Canvas->LineTo(3.125,68.9);
PaintBox1->Canvas->LineTo(6.25,66.525);
PaintBox1->Canvas->LineTo(12.5,63.175);
PaintBox1->Canvas->LineTo(18.75,60.6);
PaintBox1->Canvas->LineTo(25 ,58.525);
PaintBox1->Canvas->LineTo(37.5,55.275);
PaintBox1->Canvas->LineTo(50 ,53);
PaintBox1->Canvas->LineTo(62.5,51.475);
PaintBox1->Canvas->LineTo(75 ,50.6);
}
}
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Vincent2424
一般會員 發表：57 回覆：40 積分：19 註冊：2004-12-15 發送簡訊給我 |
發表時間：2004-12-27 12:12:08
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系統時間：2024-07-03 5:01:14
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