public static List <Point> DDA(Point point1, Point point2)
{
Point point3 = new Point(point1.X, point2.Y);
Point point4 = new Point(point2.X, point1.Y);
List <Point> points = new List <Point>();
List <Point> temp = new List <Point>();
temp = DrawLine.DDA(point1, point3);
points.AddRange(temp);
temp = DrawLine.DDA(point1, point4);
points.AddRange(temp);
temp = DrawLine.DDA(point4, point2);
points.AddRange(temp);
temp = DrawLine.DDA(point2, point3);
points.AddRange(temp);
return(points);
}
private void DrawArrow(PointF ArrowStart, PointF ArrowEnd, int ArrowMultiplier)
{
//tip of the arrow
PointF arrowPoint = ArrowEnd;
//determine arrow length
double arrowLength = Math.Sqrt(Math.Pow(Math.Abs(ArrowStart.X - ArrowEnd.X), 2) +
Math.Pow(Math.Abs(ArrowStart.Y - ArrowEnd.Y), 2));
//determine arrow angle
double arrowAngle = Math.Atan2(Math.Abs(ArrowStart.Y - ArrowEnd.Y), Math.Abs(ArrowStart.X - ArrowEnd.X));
//get the x,y of the back of the point
//to change from an arrow to a diamond, change the 3
//in the next if/else blocks to 6
double pointX, pointY;
if (ArrowStart.X > ArrowEnd.X)
{
pointX = ArrowStart.X - (Math.Cos(arrowAngle) * (arrowLength - (3 * ArrowMultiplier)));
}
else
{
pointX = Math.Cos(arrowAngle) * (arrowLength - (3 * ArrowMultiplier)) + ArrowStart.X;
}
if (ArrowStart.Y > ArrowEnd.Y)
{
pointY = ArrowStart.Y - (Math.Sin(arrowAngle) * (arrowLength - (3 * ArrowMultiplier)));
}
else
{
pointY = (Math.Sin(arrowAngle) * (arrowLength - (3 * ArrowMultiplier))) + ArrowStart.Y;
}
PointF arrowPointBack = new PointF((float)pointX, (float)pointY);
//get the secondary angle of the left tip
double angleB = Math.Atan2((3 * ArrowMultiplier), (arrowLength - (3 * ArrowMultiplier)));
double angleC = Math.PI * (90 - (arrowAngle * (180 / Math.PI)) - (angleB * (180 / Math.PI))) / 180;
//get the secondary length
double secondaryLength = (3 * ArrowMultiplier) / Math.Sin(angleB);
if (ArrowStart.X > ArrowEnd.X)
{
pointX = ArrowStart.X - (Math.Sin(angleC) * secondaryLength);
}
else
{
pointX = (Math.Sin(angleC) * secondaryLength) + ArrowStart.X;
}
if (ArrowStart.Y > ArrowEnd.Y)
{
pointY = ArrowStart.Y - (Math.Cos(angleC) * secondaryLength);
}
else
{
pointY = (Math.Cos(angleC) * secondaryLength) + ArrowStart.Y;
}
//get the left point
PointF arrowPointLeft = new PointF((float)pointX, (float)pointY);
//move to the right point
angleC = arrowAngle - angleB;
if (ArrowStart.X > ArrowEnd.X)
{
pointX = ArrowStart.X - (Math.Cos(angleC) * secondaryLength);
}
else
{
pointX = (Math.Cos(angleC) * secondaryLength) + ArrowStart.X;
}
if (ArrowStart.Y > ArrowEnd.Y)
{
pointY = ArrowStart.Y - (Math.Sin(angleC) * secondaryLength);
}
else
{
pointY = (Math.Sin(angleC) * secondaryLength) + ArrowStart.Y;
}
PointF arrowPointRight = new PointF((float)pointX, (float)pointY);
//create the point list
PointF[] arrowPoints = new PointF[4];
arrowPoints[0] = arrowPoint;
arrowPoints[1] = arrowPointLeft;
arrowPoints[2] = arrowPointBack;
arrowPoints[3] = arrowPointRight;
Point arrowPointInt = new Point((int)Math.Round(arrowPoint.X), (int)Math.Round(arrowPoint.Y));
Point arrowPointBackInt = new Point((int)Math.Round(arrowPointBack.X), (int)Math.Round(arrowPointBack.Y));
Point arrowPointLeftInt = new Point((int)Math.Round(arrowPointLeft.X), (int)Math.Round(arrowPointLeft.Y));
Point arrowPointRightInt = new Point((int)Math.Round(arrowPointRight.X), (int)Math.Round(arrowPointRight.Y));
List <Point> points = DrawLine.DDA(arrowPointInt, arrowPointLeftInt);
DrawMyShape(points, 1);
points = DrawLine.DDA(arrowPointInt, arrowPointRightInt);
DrawMyShape(points, 1);
points = DrawLine.DDA(arrowPointLeftInt, arrowPointBackInt);
DrawMyShape(points, 1);
points = DrawLine.DDA(arrowPointRightInt, arrowPointBackInt);
DrawMyShape(points, 1);
//draw the outline
//g.DrawPolygon(pen, arrowPoints);
//fill the polygon
//g.FillPolygon(new SolidBrush(pen.Color), arrowPoints);
}
private void drawPanel_MouseDown(object sender, MouseEventArgs e)
{
// xu ly ve doan thang
if (drawLine == false)
{
moving = true;
point1.X = e.X;
point1.Y = e.Y;
}
else
{
Label label = new Label();
Point point = MyCoordinate.ConvertToMyPoint(new Point(e.X, e.Y));
label.Location = new Point(e.X + 10, e.Y);
label.Text = "(" + MyCoordinate.ConvertToMyPoint(point).X + ", " + MyCoordinate.ConvertToMyPoint(point).Y + ")";
label.Text = "(" + point.X + ", " + point.Y + ")";
label.SendToBack();
label.ForeColor = Color.Red;
label.AutoSize = true;
drawPanel.Controls.Add(label);
label.Show();
if (isPoint1 == false)
{
this.transformationComboBox.Enabled = false;
point1.X = e.X;
point1.Y = e.Y;
isPoint1 = true;
if (isEllipseCenter == false && lineStyleComboBox.SelectedIndex == 6)
{
centerPoint = point1;
isPoint1 = false;
isEllipseCenter = true;
}
}
else if (isPoint1 && !isPoint2)
{
this.transformationComboBox.Enabled = true;
point2.X = e.X;
point2.Y = e.Y;
isPoint2 = true;
Point firstPoint = point1;
Point seccondPoint = point2;
List <Point> points = DrawLine.DDA(firstPoint, seccondPoint);
switch (lineStyleComboBox.SelectedIndex)
{
case 0:
{
DrawMyShape(points);
if (hasArrowCheckBox.Checked)
{
DrawArrow(point1, point2, 3);
}
break;
}
case 1:
{
points = DrawLine.DashLine(points);
DrawMyShape(points, 1);
if (hasArrowCheckBox.Checked)
{
DrawArrow(point1, point2, 3);
}
break;
}
case 2:
{
points = DrawLine.DashedLineWithOneDot(points);
DrawMyShape(points, 1);
if (hasArrowCheckBox.Checked)
{
DrawArrow(point1, point2, 3);
}
break;
}
case 3:
{
points = DrawLine.DashLineWithTwoDot(points);
DrawMyShape(points, 1);
if (hasArrowCheckBox.Checked)
{
DrawArrow(point1, point2, 3);
}
break;
}
case 4:
{
points = DrawRecangle.DDA(point1, point2);
DrawMyShape(points);
break;
}
case 5:
{
int radius = (int)Math.Sqrt(Math.Pow(point2.X - point1.X, 2) + Math.Pow(point2.Y - point1.Y, 2));
points = DrawCircle.circleBrese(point1.X, point1.Y, radius);
DrawMyShape(points);
break;
}
case 6:
{
int radiusX = (int)Math.Sqrt(Math.Pow(point1.X - centerPoint.X, 2) + Math.Pow(point1.Y - centerPoint.Y, 2));
int radiusY = (int)Math.Sqrt(Math.Pow(point2.X - centerPoint.X, 2) + Math.Pow(point2.Y - centerPoint.Y, 2));;
points = DrawEllipse.MidPoint(centerPoint, radiusX, radiusY);
DrawMyShape(points);
isEllipseCenter = false;
break;
}
default:
break;
}
shapesPoints.Add(points);
defaultPoints = shapesPoints.ElementAt(shapesPoints.Count - 1);
isPoint1 = isPoint2 = false;
}
}
}