Hi, this is a really simple question I have been banging my head on a
brick wall over.
The program below changes the background colour of a form depending on
whether the cursor is inside a rectangle drawn on the form or not. It
works perfectly as shown below.
But it won't work if I change the values of scaleFactor, rotateFactor,
translateFactor X, translateFactor Y in the program. I would like to
'correct' the values of e.X and e.Y in "OnMouseMov e" so the program
works if I change scaleFactor, rotateFactor etc. I can't get it right
without using slow trigonometry and lots of if statements. I want to
use a matrix transformation similar to how I have done it with
"e.Graphics.Sca leTransform(sca leFactor, scaleFactor)" shown below -
but can't figure it out.
Please please please can someone help me out here.
Thank you in advance
Colin
Here is how to use this sourcecode
1. Launch VS2003
2. Select "New Project"
3. Select "Visual Basic Projects" and "Windows Application" and press
"OK"
4. Double click on "Form1" and paste in the following
Public Class Form1
Inherits System.Windows. Forms.Form
'[+] Windows Form Designer generated code
Dim rectOffX As Integer = 40 'rectangle offset on form
Dim rectOffY As Integer = 30
Dim scaleFactor As Integer = 1
Dim rotateFactor As Integer = 0
Dim translateFactor X As Integer = 0
Dim translateFactor Y As Integer = 0
Protected Overrides Sub OnPaint(ByVal e As
System.Windows. Forms.PaintEven tArgs)
MyBase.OnPaint( e)
Dim container As Drawing2D.Graph icsContainer =
e.Graphics.Begi nContainer
Dim myOriginalMatri x As Drawing2D.Matri x =
e.Graphics.Tran sform()
e.Graphics.Scal eTransform(scal eFactor, scaleFactor)
e.Graphics.Rota teTransform(rot ateFactor)
e.Graphics.Tran slateTransform( translatefactor X,
translateFactor Y)
'drawing stuff in here
Dim drawRect As Rectangle = New Rectangle(rectO ffX, rectOffY,
30, 10)
e.Graphics.Draw Rectangle(New Pen(Color.Blue) , drawRect)
e.Graphics.EndC ontainer(contai ner)
e.Graphics.Tran sform = myOriginalMatri x
End Sub
Protected Overrides Sub OnMouseMove(ByV al e As
System.Windows. Forms.MouseEven tArgs)
MyBase.OnMouseM ove(e)
Dim cursorRect As Rectangle = New Rectangle(e.X, e.Y, 1, 1)
Dim drawRect As Rectangle = New Rectangle(rectO ffX, rectOffY,
30, 10)
If drawRect.Inters ectsWith(cursor Rect) Then
Me.BackColor = Color.Yellow
Else
Me.BackColor = Color.Gray
End If
End Sub
End Class
4  2651 
What kind of object is your rectangle.
Simple answer, see HitTest
"Colin McGuire" <co***********@ lycos.co.uk> wrote in message
news:ab******** *************** ***@posting.goo gle.com... Hi, this is a really simple question I have been banging my head on a
brick wall over.
The program below changes the background colour of a form depending on
whether the cursor is inside a rectangle drawn on the form or not. It
works perfectly as shown below.
But it won't work if I change the values of scaleFactor, rotateFactor,
translateFactor X, translateFactor Y in the program. I would like to
'correct' the values of e.X and e.Y in "OnMouseMov e" so the program
works if I change scaleFactor, rotateFactor etc. I can't get it right
without using slow trigonometry and lots of if statements. I want to
use a matrix transformation similar to how I have done it with
"e.Graphics.Sca leTransform(sca leFactor, scaleFactor)" shown below -
but can't figure it out.
Please please please can someone help me out here.
Thank you in advance
Colin
Here is how to use this sourcecode
1. Launch VS2003
2. Select "New Project"
3. Select "Visual Basic Projects" and "Windows Application" and press
"OK"
4. Double click on "Form1" and paste in the following
Public Class Form1
Inherits System.Windows. Forms.Form
'[+] Windows Form Designer generated code
Dim rectOffX As Integer = 40 'rectangle offset on form
Dim rectOffY As Integer = 30
Dim scaleFactor As Integer = 1
Dim rotateFactor As Integer = 0
Dim translateFactor X As Integer = 0
Dim translateFactor Y As Integer = 0
Protected Overrides Sub OnPaint(ByVal e As
System.Windows. Forms.PaintEven tArgs)
MyBase.OnPaint( e)
Dim container As Drawing2D.Graph icsContainer =
e.Graphics.Begi nContainer
Dim myOriginalMatri x As Drawing2D.Matri x =
e.Graphics.Tran sform()
e.Graphics.Scal eTransform(scal eFactor, scaleFactor)
e.Graphics.Rota teTransform(rot ateFactor)
e.Graphics.Tran slateTransform( translatefactor X,
translateFactor Y)
'drawing stuff in here
Dim drawRect As Rectangle = New Rectangle(rectO ffX, rectOffY,
30, 10)
e.Graphics.Draw Rectangle(New Pen(Color.Blue) , drawRect)
e.Graphics.EndC ontainer(contai ner)
e.Graphics.Tran sform = myOriginalMatri x
End Sub
Protected Overrides Sub OnMouseMove(ByV al e As
System.Windows. Forms.MouseEven tArgs)
MyBase.OnMouseM ove(e)
Dim cursorRect As Rectangle = New Rectangle(e.X, e.Y, 1, 1)
Dim drawRect As Rectangle = New Rectangle(rectO ffX, rectOffY,
30, 10)
If drawRect.Inters ectsWith(cursor Rect) Then
Me.BackColor = Color.Yellow
Else
Me.BackColor = Color.Gray
End If
End Sub
End Class
What kind of object is your rectangle.
Simple answer, see HitTest
"Colin McGuire" <co***********@ lycos.co.uk> wrote in message
news:ab******** *************** ***@posting.goo gle.com... Hi, this is a really simple question I have been banging my head on a
brick wall over.
The program below changes the background colour of a form depending on
whether the cursor is inside a rectangle drawn on the form or not. It
works perfectly as shown below.
But it won't work if I change the values of scaleFactor, rotateFactor,
translateFactor X, translateFactor Y in the program. I would like to
'correct' the values of e.X and e.Y in "OnMouseMov e" so the program
works if I change scaleFactor, rotateFactor etc. I can't get it right
without using slow trigonometry and lots of if statements. I want to
use a matrix transformation similar to how I have done it with
"e.Graphics.Sca leTransform(sca leFactor, scaleFactor)" shown below -
but can't figure it out.
Please please please can someone help me out here.
Thank you in advance
Colin
Here is how to use this sourcecode
1. Launch VS2003
2. Select "New Project"
3. Select "Visual Basic Projects" and "Windows Application" and press
"OK"
4. Double click on "Form1" and paste in the following
Public Class Form1
Inherits System.Windows. Forms.Form
'[+] Windows Form Designer generated code
Dim rectOffX As Integer = 40 'rectangle offset on form
Dim rectOffY As Integer = 30
Dim scaleFactor As Integer = 1
Dim rotateFactor As Integer = 0
Dim translateFactor X As Integer = 0
Dim translateFactor Y As Integer = 0
Protected Overrides Sub OnPaint(ByVal e As
System.Windows. Forms.PaintEven tArgs)
MyBase.OnPaint( e)
Dim container As Drawing2D.Graph icsContainer =
e.Graphics.Begi nContainer
Dim myOriginalMatri x As Drawing2D.Matri x =
e.Graphics.Tran sform()
e.Graphics.Scal eTransform(scal eFactor, scaleFactor)
e.Graphics.Rota teTransform(rot ateFactor)
e.Graphics.Tran slateTransform( translatefactor X,
translateFactor Y)
'drawing stuff in here
Dim drawRect As Rectangle = New Rectangle(rectO ffX, rectOffY,
30, 10)
e.Graphics.Draw Rectangle(New Pen(Color.Blue) , drawRect)
e.Graphics.EndC ontainer(contai ner)
e.Graphics.Tran sform = myOriginalMatri x
End Sub
Protected Overrides Sub OnMouseMove(ByV al e As
System.Windows. Forms.MouseEven tArgs)
MyBase.OnMouseM ove(e)
Dim cursorRect As Rectangle = New Rectangle(e.X, e.Y, 1, 1)
Dim drawRect As Rectangle = New Rectangle(rectO ffX, rectOffY,
30, 10)
If drawRect.Inters ectsWith(cursor Rect) Then
Me.BackColor = Color.Yellow
Else
Me.BackColor = Color.Gray
End If
End Sub
End Class
"CJ Taylor" <no****@blowgoa ts.com> wrote in message news:<10******* ******@corp.sup ernews.com>... What kind of object is your rectangle.
Simple answer, see HitTest
The rectangle is not an object, it is just painted on the form (see
code in original posting).
Colin
"CJ Taylor" <no****@blowgoa ts.com> wrote in message news:<10******* ******@corp.sup ernews.com>... What kind of object is your rectangle.
Simple answer, see HitTest
The rectangle is not an object, it is just painted on the form (see
code in original posting).
Colin This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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