Transcript PictureBoxes

Mouse event handling
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Mouse events( delegates EventHandler,
event arguments EventArgs)
MouseEnter: raised if the mouse cursor
enters the area of the control
MoueLeave: raised if the mouse cursor
leaves the area of control
Mouse events(delegates
MouseEventHandler, event arguments
MouseEventArgs)
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MouseDown:raised if the mouse button is
pressed while its cursor is over the area
of the control
MouseHover:Raised if the mouse cursor
hovers over the eara of the control
MouseMove: Raised if the mouse cursor is
moved while in the area of the control
MouseUp: Raised if the mouse button is
released when the cursor is over the area
of the control
MouseEventArgs properties
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Button: Mouse button that was
pressed(left, right, middle or none)
Clicks: the number of times the mouse
button (either mouse button) was clicked
X: the x-coordinate of the event, relative
to the control
Y: the y-coordinate of the event, relative
to control
Graphics
Create a Graphics class object and
use it to draw on the form
 Graphics *graphic =
CreateGraphics();
 Method FillEllipse draws a circle
 graphics->FillEllipse(new
SolidBrush(Color::BlueViolet),
 e->X,e->Y,4,4);
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Assignment
Extend the example to include options for
changing the the size and color of the lines
drawn
 Create a drawing area
Hint: Have variables to keep track of the currently
selected size(int ) and color( Color object ). Set
them using the eventhandlers for the radio
buttons. For the color, use the various Color
constants ( such as Color::Blue). When
responsding to the mouse moves, simply use the
size and color variables to determine the proper
size and color
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