請問ComboBox繪圖(圖形發生重疊)問題 |
|
尚未結案
|
|
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???
|
|
allenchan
資深會員  發表：10 回覆：306 積分：283 註冊：2004-01-06 發送簡訊給我 |
加上大括號(紅字部分)：
void __fastcall TForm1::ComboBox1Change(TObject *Sender)
{
ListBox1->Canvas->FillRect(Rect(0, 0, ListBox1->Width, ListBox1->Height)); 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);
}
}
|
|
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 14:33:24
IP:163.25.xxx.xxx 未訂閱
系統時間：2024-04-28 11:26:15
聯絡我們 | Delphi K.Top討論版
| 本站聲明 |
|
1. 本論壇為無營利行為之開放平台，所有文章都是由網友自行張貼，如牽涉到法律糾紛一切與本站無關。 2. 假如網友發表之內容涉及侵權，而損及您的利益，請立即通知版主刪除。 3. 請勿批評中華民國元首及政府或批評各政黨，是藍是綠本站無權干涉，但這裡不是政治性論壇！ |