from MSDN:
Line Method Example
This example uses the Line method to draw concentric boxes on a form. To try this example, paste the code into the General section of a form. Then press F5 and click the form.Sub Form_Click ()
Dim CX, CY, F, F1, F2, I ' Declare variables
ScaleMode = 3 ' Set ScaleMode to pixels.
CX = ScaleWidth / 2 ' Get horizontal center.
CY = ScaleHeight / 2 ' Get vertical center.
DrawWidth = 8 ' Set DrawWidth.
For I = 50 To 0 Step -2
F = I / 50 ' Perform interim
F1 = 1 - F: F2 = 1 + F ' calculations.
Forecolor = QBColor(I Mod 15) ' Set foreground color.
Line (CX * F1, CY * F1)-(CX * F2, CY * F2), , BF
Next I
DoEvents ' Yield for other processing.
If CY > CX Then ' Set DrawWidth.
DrawWidth = ScaleWidth / 25
Else
DrawWidth = ScaleHeight / 25
End If
For I = 0 To 50 Step 2 ' Set up loop.
F = I / 50 ' Perform interim
F1 = 1 - F: F2 = 1 + F ' calculations.
Line (CX * F1, CY)-(CX, CY * F1) ' Draw upper-left.
Line -(CX * F2, CY) ' Draw upper-right.
Line -(CX, CY * F2) ' Draw lower-right.
Line -(CX * F1, CY) ' Draw lower-left.
Forecolor = QBColor(I Mod 15) ' Change color each time.
Next I
DoEvents ' Yield for other processing.
End Sub
Line Method Example
This example uses the Line method to draw concentric boxes on a form. To try this example, paste the code into the General section of a form. Then press F5 and click the form.Sub Form_Click ()
Dim CX, CY, F, F1, F2, I ' Declare variables
ScaleMode = 3 ' Set ScaleMode to pixels.
CX = ScaleWidth / 2 ' Get horizontal center.
CY = ScaleHeight / 2 ' Get vertical center.
DrawWidth = 8 ' Set DrawWidth.
For I = 50 To 0 Step -2
F = I / 50 ' Perform interim
F1 = 1 - F: F2 = 1 + F ' calculations.
Forecolor = QBColor(I Mod 15) ' Set foreground color.
Line (CX * F1, CY * F1)-(CX * F2, CY * F2), , BF
Next I
DoEvents ' Yield for other processing.
If CY > CX Then ' Set DrawWidth.
DrawWidth = ScaleWidth / 25
Else
DrawWidth = ScaleHeight / 25
End If
For I = 0 To 50 Step 2 ' Set up loop.
F = I / 50 ' Perform interim
F1 = 1 - F: F2 = 1 + F ' calculations.
Line (CX * F1, CY)-(CX, CY * F1) ' Draw upper-left.
Line -(CX * F2, CY) ' Draw upper-right.
Line -(CX, CY * F2) ' Draw lower-right.
Line -(CX * F1, CY) ' Draw lower-left.
Forecolor = QBColor(I Mod 15) ' Change color each time.
Next I
DoEvents ' Yield for other processing.
End Sub
要不然窗体刷新时图像会消失还要注意绘制完后,用Refresh方法刷新