// This is a constructor method for the DrawIt class. Notice that it has the same name ("DrawIt") as the class,
// and does not have a return type. That's how we know it's a constructor method.
public DrawIt()
{
// This may look familiar from last week's "create a Windows Forms application" assignment.
// It is generated by Visual Studio to do the initial setup of the controls on your Windows Form.
InitializeComponent();
// This line creates a new DrawingModel which wraps around and encapsulates
// the CanvasPanel, and then stores that DrawingModel into the instance variable
// _canvasModel.
//
// Since _canvasModel is an "instance variable" (declared as part of the DrawIt
// class, above), all of the "instance methods" here in DrawIt (also declared as
// part of the DrawIt class) will be able to see it. Anything that wants to draw
// something on the canvas can say _canvasModel.DrawLine() or _canvasModel.DrawCircle() or...
//
// I have implemented versions of HandleMouseDown() and HandleMouseMoved() below
// that draw simple circles on the canvas, and a circular cursor to show where
// the next circle will be drawn, to illustrate how to use the DrawingModel.
_canvasModel = new DrawingModel(CanvasPanel);
// This creates the Pen intance that draws lines on the canvas.
_pen = new Pen(_COLOR, _LINE_WIDTH);
// This starts us out with a dark gray background on the canvas (so the user can see
// where to draw).
_canvasModel.Clear(_BACKGROUND_COLOR);
// These three lines add "event handlers" to the canvas so that we get told when the user
// does something with the mouse. An "event handler" is just a method that knows how to
// respond to an event (something that happened). You can watch the extra session from
// this Thursday if you want to see how to create a method like this.
CanvasPanel.MouseDown += HandleMouseDown;
CanvasPanel.MouseUp += HandleMouseUp;
CanvasPanel.MouseMove += HandleMouseMoved;
}
// This is a constructor method for the DrawIt class. Notice that it has the same name ("DrawIt") as the class,
// and does not have a return type. That's how we know it's a constructor method.
public DrawIt()
{
// This may look familiar from last week's "create a Windows Forms application" assignment.
// It is generated by Visual Studio to do the initial setup of the controls on your Windows Form.
InitializeComponent();
// This line creates a new DrawingModel which wraps around and encapsulates
// the CanvasPanel, and then stores that DrawingModel into the instance variable
// _canvasModel.
//
// Since _canvasModel is an "instance variable" (declared as part of the DrawIt
// class, above), all of the "instance methods" here in DrawIt (also declared as
// part of the DrawIt class) will be able to see it. Anything that wants to draw
// something on the canvas can say _canvasModel.DrawLine() or _canvasModel.DrawCircle() or...
//
// I have implemented versions of HandleMouseDown() and HandleMouseMoved() below
// that draw simple circles on the canvas, and a circular cursor to show where
// the next circle will be drawn, to illustrate how to use the DrawingModel.
_canvasModel = new DrawingModel(CanvasPanel);
// This line creates a PaintbrushControlModel to listen to the mouse events from the
// CanvasPanel, and call our IPaintbrushEventHandler methods when appropriate.
//
// When we created the DrawingModel above, we put it into an instance variable called
// "_canvasModel", because we needed to be able to call methods on it later.
//
// We don't need to call any methods on the PaintbrushControlModel later, so we
// aren't going to put it into an instance variable. Just creating it with the
// CanvasPanel and ourself is enough.
//
// If we decided later to give the PaintbrushControlModel methods that we'd want
// to call (for example, a "SuspendDrawing()" method that blocked all drawing
// actions from being forwarded to us), we'd make an instance variable _paintbrushControlModel
// and set its value to this new object.
new PaintbrushControlModel(CanvasPanel, this);
// This creates the Pen intance that draws lines on the canvas.
_pen = new Pen(_COLOR, _LINE_WIDTH);
// This starts us out with a dark gray background on the canvas (so the user can see
// where to draw).
_canvasModel.Clear(_BACKGROUND_COLOR);
}
private void ClearButtonClicked(object sender, EventArgs e)
{
_canvasModel.Clear(_BACKGROUND_COLOR);
}
// This is a constructor method for the DrawIt class. Notice that it has the same name ("DrawIt") as the class,
// and does not have a return type. That's how we know it's a constructor method.
public DrawIt()
{
// This may look familiar from last week's "create a Windows Forms application" assignment.
// It is generated by Visual Studio to do the initial setup of the controls on your Windows Form.
InitializeComponent();
// This line creates a new DrawingModel which wraps around and encapsulates
// the CanvasPanel, and then stores that DrawingModel into the instance variable
// _canvasModel.
//
// Since _canvasModel is an "instance variable" (declared as part of the DrawIt
// class, above), all of the "instance methods" here in DrawIt (also declared as
// part of the DrawIt class) will be able to see it. Anything that wants to draw
// something on the canvas can say _canvasModel.DrawLine() or _canvasModel.DrawCircle() or...
//
// I have implemented versions of HandleMouseDown() and HandleMouseMoved() below
// that draw simple circles on the canvas, and a circular cursor to show where
// the next circle will be drawn, to illustrate how to use the DrawingModel.
_canvasModel = new DrawingModel(CanvasPanel);
// This line creates a PaintbrushControlModel to listen to the mouse events from the
// CanvasPanel, and call our IPaintbrushEventHandler methods when appropriate.
//
// When we created the DrawingModel above, we put it into an instance variable called
// "_canvasModel", because we needed to be able to call methods on it later.
//
// We don't need to call any methods on the PaintbrushControlModel later, so we
// aren't going to put it into an instance variable. Just creating it with the
// CanvasPanel and ourself is enough.
//
// If we decided later to give the PaintbrushControlModel methods that we'd want
// to call (for example, a "SuspendDrawing()" method that blocked all drawing
// actions from being forwarded to us), we'd make an instance variable _paintbrushControlModel
// and set its value to this new object.
new PaintbrushControlModel(CanvasPanel, this);
// This creates the Pen intance that draws lines on the canvas.
_pen = new Pen(_COLOR, _LINE_WIDTH);
// This starts us out with a dark gray background on the canvas (so the user can see
// where to draw).
_canvasModel.Clear(_BACKGROUND_COLOR);
}
// This is a constructor method for the DrawIt class. Notice that it has the same name ("DrawIt") as the class,
// and does not have a return type. That's how we know it's a constructor method.
public DrawIt()
{
// This may look familiar from last week's "create a Windows Forms application" assignment.
// It is generated by Visual Studio to do the initial setup of the controls on your Windows Form.
InitializeComponent();
// This line creates a new DrawingModel which wraps around and encapsulates
// the CanvasPanel, and then stores that DrawingModel into the instance variable
// _canvasModel.
//
// Since _canvasModel is an "instance variable" (declared as part of the DrawIt
// class, above), all of the "instance methods" here in DrawIt (also declared as
// part of the DrawIt class) will be able to see it. Anything that wants to draw
// something on the canvas can say _canvasModel.DrawLine() or _canvasModel.DrawCircle() or...
//
// I have implemented versions of HandleMouseDown() and HandleMouseMoved() below
// that draw simple circles on the canvas, and a circular cursor to show where
// the next circle will be drawn, to illustrate how to use the DrawingModel.
_canvasModel = new DrawingModel(CanvasPanel);
// This creates the Pen intance that draws lines on the canvas.
_pen = new Pen(_COLOR, _LINE_WIDTH);
// This starts us out with a dark gray background on the canvas (so the user can see
// where to draw).
_canvasModel.Clear(_BACKGROUND_COLOR);
// These three lines add "event handlers" to the canvas so that we get told when the user
// does something with the mouse. An "event handler" is just a method that knows how to
// respond to an event (something that happened). You can watch the extra session from
// this Thursday if you want to see how to create a method like this.
CanvasPanel.MouseDown += HandleMouseDown;
CanvasPanel.MouseUp += HandleMouseUp;
CanvasPanel.MouseMove += HandleMouseMoved;
}