/// <summary>
/// Draw circle on mouse click and enable mouse drag
/// </summary>
/// <param name="sender">sender object</param>
/// <param name="e">event</param>
private void pictureBoxMain_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == MouseButtons.Left)
{
int cX = e.X;
int cY = e.Y;
Random random = new Random();
int diameter = (int)(100 * random.NextDouble()) + 50;
curCircle = new MCircle(diameter, new Point(cX, cY));
circles.Add(curCircle);
curX = cX;
curY = cY;
curXX = e.X;
curYY = e.Y;
isDragging = true;
}
}
/// <summary>
/// Support method for calculating motion of circles
/// </summary>
/// <param name="c">Circle object</param>
/// <returns>Time elapsed, if 0 means no collision</returns>
private double MotionCalc(MCircle c)
{
double timeElapsed = 0;
Point tempDestination = Physics.DestinationPosition(c.V, c.a, INTERVAL, c.P);
Vector collisionVector = Physics.BoundaryCollision(tempDestination, c.Diameter / 2,
pictureBoxMain.Width, pictureBoxMain.Height);
if (collisionVector.X == 0 && collisionVector.Y == 0)
{
c.P = new Point(tempDestination.X, tempDestination.Y);
c.V = Physics.CalcVelocity(c.V, c.a, INTERVAL);
c.a = Physics.CalcAcceleration(c.V, 100, c.Diameter / 2);
return(timeElapsed);
}
else
{
if (collisionVector.X != 0)
{
timeElapsed = Physics.TimeElapsed(c.V.X, c.a.X, (int)collisionVector.X);
c.P = Physics.DestinationPosition(c.V, c.a, timeElapsed, c.P);
c.V = Physics.CalcVelocity(c.V, c.a, timeElapsed);
c.V = new Velocity(-c.V.X, c.V.Y);
c.a = Physics.CalcAcceleration(c.V, 100, c.Diameter / 2);
c.P = Physics.DestinationPosition(c.V, c.a, INTERVAL - timeElapsed, c.P);
}
else
{
timeElapsed = Physics.TimeElapsed(c.V.Y, c.a.Y, (int)collisionVector.Y);
c.P = Physics.DestinationPosition(c.V, c.a, timeElapsed, c.P);
c.V = Physics.CalcVelocity(c.V, c.a, timeElapsed);
c.V = new Velocity(c.V.X, -c.V.Y);
c.a = Physics.CalcAcceleration(c.V, 100, c.Diameter / 2);
c.P = Physics.DestinationPosition(c.V, c.a, INTERVAL - timeElapsed, c.P);
}
return(timeElapsed);
}
}
/// <summary>
/// Generate circle on a specific spot
/// </summary>
/// <param name="sender">sender object</param>
/// <param name="e">event</param>
private void circleToolStripMenuItem_Click(object sender, EventArgs e)
{
MCircle circle = new MCircle(100, new Point(500, 200));
circles.Add(circle);
}
