/// <summary>
/// when mouse was presses the create on of the following shapes depending
/// on what the user desided to draw.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void frmSETPaint_MouseDown(object sender, MouseEventArgs e)
{
/* checks to see which of the options was clicked.*/
if(tsbLine.Checked == true)
{
currentDrawObject = new Line(currentLineColour, currentLineThickness);
}
else if(tsbRectangle.Checked == true)
{
currentDrawObject = new RectangleShape(currentLineColour, currentFillColour, currentLineThickness);
}
else if(tsbEllipse.Checked == true)
{
currentDrawObject = new Ellipse(currentLineColour, currentFillColour, currentLineThickness);
}
if (currentDrawObject != null)
{
currentDrawObject.startPoint = e.Location;
currentDrawObject.endPoint = e.Location;
}
}
/// <summary>
/// Opening a new file ensure object passed is new and using a try statement
/// we will try to open the file. If the test pass then it will try to read the file
/// and put the data from file into data members ( DtawObjects class).
/// </summary>
/// <param name="filename"></param>
/// <param name="drawObjectHistory"></param>
/// <returns>status</returns>
public static bool OpenSETPaintFile(string filename, List<DrawObject> drawObjectHistory)
{
BinaryReader openFile;
byte tempByte = 0;
DrawObject drawObject = new DrawObject();
bool status = true;
drawObjectHistory.Clear(); /*opening a new file ensure object passed is new*/
try
{
openFile = new BinaryReader(File.Open(filename, FileMode.Open, FileAccess.Read));
}
catch (Exception)
{
return false;
}
try
{
if(openFile.ReadByte() != 58) /*read and test file magic number*/
{
return false;
}
/*loop and check if its a line /Rectangle or ellipse and put the values into
data members.*/
while (true)
{
tempByte = openFile.ReadByte();
if(tempByte == (byte)DrawObjectType.Line)
{
drawObject = new Line();
}
else if(tempByte == (byte)DrawObjectType.Rectangle)
{
drawObject = new RectangleShape();
}
else if(tempByte == (byte)DrawObjectType.Ellipse)
{
drawObject = new Ellipse();
}
drawObject.startPoint = new Point(openFile.ReadInt32(), openFile.ReadInt32());
drawObject.endPoint = new Point(openFile.ReadInt32(), openFile.ReadInt32());
drawObject.fillColour = Color.FromArgb(openFile.ReadInt32());
drawObject.lineColour = Color.FromArgb(openFile.ReadInt32());
drawObject.lineThickness = openFile.ReadInt32();
drawObjectHistory.Add(drawObject);
}
}
catch (EndOfStreamException)
{
status = true;
}
catch (Exception)
{
status = false;
}
finally
{
openFile.Close();
}
return status;
}
/// <summary>
/// When the mouse was released, the program can go ahead and add the object to the list .
/// Also there is no need for cast because its already taken care by the compiler.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void frmSETPaint_MouseUp(object sender, MouseEventArgs e)
{
if(currentDrawObject != null)
{
if(currentDrawObject.startPoint != currentDrawObject.endPoint)
{
drawObjectHistory.Add(currentDrawObject);
}
currentDrawObject = null;
}
this.Refresh();
}