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Suzie
NA
4
0
How to Drawing on a panel in C#
Apr 1 2007 11:16 PM
Hi,
I'm new to C# and trying to develop this program that allows the user to draw freeform with the mouse on a panel. There are 2 groupboxes. One is called Color and it has 4 radio buttons: red, blue, green and black. The second is Size and has 3 radio buttons: small, medium, and large. The user should be able to select a color and a brush size and draw on the panel. Here is what I have so far. Any help will be greatly appreciated.
[CODE]
public
partial
class
drawingPanelForm
:
Form
{
bool
shouldPaint =
false
;
// determines whether to paint
private
Color
m_Color;
private
Size
m_Size;
public
void
FillEllipse(
Brush
brush,
int
x,
int
y,
int
width,
int
height);
Brush
brush;
int
x;
int
y;
int
width;
int
height;
//default constructor
public
drawingPanelForm()
{
InitializeComponent();
}
//should paint when mouse button is pressed down
private
void
drawingPanelForm_MouseDown(
object
sender,
MouseEventArgs
e)
{
//indicate that user is dragging the mouse
shouldPaint =
true
;
}
//stop painting when mouse button is released
private
void
drawingPanelForm_MouseUp(
object
sender,
MouseEventArgs
e)
{
//indicate that user released the mouse button
shouldPaint =
false
;
}
private
void
redRadioButton_CheckedChanged(
object
sender,
EventArgs
e)
{
m_Color =
Color
.Red;
}
private
void
blueRadioButton_CheckedChanged(
object
sender,
EventArgs
e)
{
m_Color =
Color
.Blue;
}
private
void
greenRadioButton_CheckedChanged(
object
sender,
EventArgs
e)
{
m_Color =
Color
.Green;
}
private
void
blackRadioButton_CheckedChanged(
object
sender,
EventArgs
e)
{
m_Color =
Color
.Black;
}
private
void
smallRadioButton_CheckedChanged(
object
sender,
EventArgs
e)
{
m_Size =
new
Size
(4,4);
}
private
void
mediumRadioButton_CheckedChanged(
object
sender,
EventArgs
e)
{
m_Size =
new
Size
(6, 6);
}
private
void
largeRadioButton_CheckedChanged(
object
sender,
EventArgs
e)
{
m_Size =
new
Size
(12, 12);
}
private
void
drawPanel_MouseMove(
object
sender,
MouseEventArgs
e)
{
if
(shouldPaint)
//check if mouse button is being pressed
{
//draw where the mouse pointer is present
Graphics
graphics = CreateGraphics();
graphics.FillEllipse(
new
SolidBrush
(m_Color), e.X, e.Y, m_Width, m_Heigth);
graphics.Dispose();
}
}
}
}
[/CODE]
Reply
Answers (
2
)
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