// Finish drawing the graphic
private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
isMouseDown = false;
startPoint = Point.Empty;
prevPoint = Point.Empty;
currentPoint = Point.Empty;
if (mode == Mode.draw)
{
if (drawMode == DrawMode.polygon)
{
// Check if a polygon is being drawn
// If it is, update the newest line
if (polygonInProgress)
{
try
{
graphic.Update(e.Location);
Polygon p = (Polygon)graphic;
polygonInProgress = p.AddLine(e.Location);
}
catch (Exception exc)
{
MessageBox.Show("An error has occured while attempting to draw a Polygon.\r\n" + exc.Message);
}
}
}
}
else
{
if (isGraphicDragging)
{
// Finish dragging the graphic
beginGraphicMove = false;
isGraphicDragging = false;
}
else
{
beginGraphicMove = false;
// If graphic is part of a group, get the group
List <GraphicObject> selectGroup = GetGroup(graphic);
if (graphic != null)
{
// Check if graphic is selected
if (graphic.IsGraphicSelected())
{
// Check if graphic is part of a group
// If part of group, deselect entire group
if (selectGroup.Count > 0)
{
foreach (GraphicObject g in selectGroup)
{
// Deselect the graphic
g.DeselectGraphic();
// Remove from list of selected graphics
selectedGraphics.Remove(g);
}
}
else
{
// Deselect the graphic
graphic.DeselectGraphic();
// Remove from list of selected graphics
selectedGraphics.Remove(graphic);
}
// Set the graphic reference to null (as nothing is selected)
graphic = null;
}
else
{
// Check if graphic is part of a group
// If part of group, select entire group
// Loop through group and select each graphic
if (selectGroup.Count > 0)
{
foreach (GraphicObject g in selectGroup)
{
// Select the graphic and show this by changing the colour
g.SelectGraphic(Color.Red);
// Add the selected graphic to the list of selected graphics
selectedGraphics.Add(g);
}
}
else
{
// Select the graphic and show this by changing the colour
graphic.SelectGraphic(Color.Red);
// Add the selected graphic to the list of selected graphics
selectedGraphics.Add(graphic);
}
}
}
}
}
List <GraphicObject> copy = new List <GraphicObject>();
GraphicObject newG;
// Loop through current graphics and create a copy
foreach (GraphicObject g in graphicObjectList)
{
newG = g.Copy(id++);
// Add the graphic to the list
copy.Add(newG);
}
// Save the current state
state.Push(currentState);
currentState = copy;
// Cause the picture box to re-paint (i.e. invoke Paint method)
Redraw();
}
public override bool Equals(object obj)
{
GraphicObject g = (GraphicObject)obj;
return(id == g.GetId());
}
// Begin drawing if in draw mode
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
// Save the last point (assign it to the current mouse position)
startPoint = e.Location;
isMouseDown = true;
// Check to see if in draw mode
if (mode == Mode.draw)
{
// Create a new GraphicsObject, depending on which draw mode is selected
switch (drawMode)
{
case DrawMode.freehand:
graphic = new FreehandLine(colour, thickness, id++);
break;
case DrawMode.line:
graphic = new Line(startPoint, colour, thickness, id++);
break;
case DrawMode.rectangle:
graphic = new Rectangle(startPoint, colour, thickness, id++);
break;
case DrawMode.ellipse:
graphic = new Ellipse(startPoint, colour, thickness, id++);
break;
case DrawMode.square:
graphic = new Square(startPoint, colour, thickness, id++);
break;
case DrawMode.circle:
graphic = new Circle(startPoint, colour, thickness, id++);
break;
}
if (drawMode == DrawMode.polygon)
{
// Check if a polygon is being drawn
// If one is not, create one
if (!polygonInProgress)
{
polygonInProgress = true;
// Create a new polygon
graphic = new Polygon(e.Location, colour, thickness, id++);
}
}
// Add the graphic to the list of existing (already drawn) graphics
graphicObjectList.Add(graphic);
}
// Must be in select mode
else
{
// See if a graphic is under the mouse
foreach (GraphicObject g in graphicObjectList)
{
// Select the graphic (if there is more than one match only select the top layer graphic (i.e. the first match))
if (g.IsGraphicAtMousePoint(e.Location))
{
// Store a reference to the graphic
graphic = g;
// Set the point on the graphic where the mouse has clicked
g.SetMouseClickDragPoint(e.Location);
// If the graphic is part of a group, set the mouse point for all graphics in the group
List <GraphicObject> group = GetGroup(graphic);
if (group.Count > 0)
{
foreach (GraphicObject gO in group)
{
gO.SetMouseClickDragPoint(e.Location);
}
}
beginGraphicMove = true;
break;
}
}
}
// Redraw
Redraw();
}