// Create a version of the with the passed-in offset.
public void SetOrigin(MyPointF origin)
{
for (int index = 0; index <= sides; index++)
{
shape[index].X = proto.shape[index].X + (int)origin.X;
shape[index].Y = proto.shape[index].Y + (int)origin.Y;
}
}
public TitleBlock(string title, string fontName, float size, Color color, Size formSize, Graphics graphics)
{
this.title = title;
this.fontName = fontName;
this.size = size;
this.color = color;
this.formSize = formSize;
font = new Font(fontName, size);
brush = new SolidBrush(color);
pen = new Pen(brush);
SizeF stringSize = graphics.MeasureString(title, font);
PointF location = new PointF(formSize.Width / 2 - stringSize.Width / 2,
formSize.Height / 2 - stringSize.Height / 2);
titleRectangle = new Rectangle(
(int)(formSize.Width / 2 - stringSize.Width / 2),
(int)(formSize.Height / 2 - stringSize.Height / 2),
(int)stringSize.Width,
(int)stringSize.Height);
titleDrawSpot = new MyPointF(titleRectangle.X, titleRectangle.Y);
float x1 = titleRectangle.X - textPad;
float y1 = titleRectangle.Y - textPad;
float x2 = titleRectangle.X + titleRectangle.Width + textPad;
float y2 = titleRectangle.Y + titleRectangle.Height + textPad;
#if fred
segments.Add(new Segment(x1, y1, x1, y2));
segments.Add(new Segment(x1, y2, x2, y2));
segments.Add(new Segment(x2, y2, x2, y1));
segments.Add(new Segment(x2, y1, x1, y1));
#endif
MyPointF p1 = new MyPointF(x1 + textPad, y1);
MyPointF p2 = new MyPointF(x2 - textPad, y1);
MyPointF p3 = new MyPointF(x2, y1 + textPad);
MyPointF p4 = new MyPointF(x2, y2 - textPad);
MyPointF p5 = new MyPointF(x2 - textPad, y2);
MyPointF p6 = new MyPointF(x1 + textPad, y2);
MyPointF p7 = new MyPointF(x1, y2 - textPad);
MyPointF p8 = new MyPointF(x1, y1 + textPad);
segments.Add(new Segment(p1, p2));
segments.Add(new Segment(p2, p3));
segments.Add(new Segment(p3, p4));
segments.Add(new Segment(p4, p5));
segments.Add(new Segment(p5, p6));
segments.Add(new Segment(p6, p7));
segments.Add(new Segment(p7, p8));
segments.Add(new Segment(p8, p1));
}
// Description: Place the ball randomly within the window (but not too close to the edge)
public void RandLoc()
{
int height = TheForm.ClientSize.Height;
int width = TheForm.ClientSize.Width;
position = new MyPointF(
(float)(size * 2 + (width - size * 4) * rand.NextDouble()),
(float)(size * 2 + (height - size * 4) * rand.NextDouble()));
topLeft = new MyPointF(size, size);
bottomRight = new MyPointF(width - size, height - size);
}
// is the point inside of the rectangle?
public bool IsInside(MyPointF point, float maxSize)
{
if ((point.X > titleRectangle.X - maxSize) &&
(point.X < titleRectangle.X + titleRectangle.Width + maxSize) &&
(point.Y > titleRectangle.Y - maxSize) &&
(point.Y < titleRectangle.Y + titleRectangle.Height + maxSize))
{
return(true);
}
else
{
return(false);
}
}
Ball collideBall = new Ball(); // ball used for collisions
public Segment(MyPointF p1, MyPointF p2)
{
this.p1 = p1;
this.p2 = p2;
vUnit = new Vector(p2.X - p1.X, p2.Y - p1.Y).MakeUnit();;
}
public static float Distance(MyPointF pt1, MyPointF pt2)
{
MyPointF delta = pt1 - pt2;
return((float)Math.Sqrt(delta.X * delta.X + delta.Y * delta.Y));
}
public Vector(MyPointF p1, MyPointF p2)
{
this.x = p2.X - p1.X;
this.y = p2.Y - p1.Y;
}
public Vector(MyPointF point)
{
this.x = point.X;
this.y = point.Y;
}
// Description: Handle gravity and collisions between the current ball and another
public void GravityCollide(Ball ball2)
{
/*
* If we're doing gravity, the calculations can be reused for collisions (if enabled)
* If we're doing collisions only, we have some short-circuit cases...
*/
if (setup.gravityBall != 0)
{
MyPointF dist = position - ball2.position;
float distSq = dist.X * dist.X + dist.Y * dist.Y;
/*
* Collision (no short-circuit - already have distance squared)
*/
if (setup.collisions)
{
int centerDistance = size + ball2.size;
int centerDistanceSq = centerDistance * centerDistance;
if (distSq <= centerDistanceSq)
{
Collide(ball2, true);
distSq = 0; // set to zero to disable gravity for this iteration
}
}
if (distSq != 0)
{
float distCu = (float)(Math.Sqrt(distSq) * distSq);
float sx = (setup.gravityBall * gval * dist.X);
float sy = (setup.gravityBall * gval * dist.Y);
velocity.X -= (sx * ball2.mass) / distCu;
velocity.Y -= (sy * ball2.mass) / distCu;
ball2.velocity.X += (sx * mass) / distCu;
ball2.velocity.Y += (sy * mass) / distCu;
}
}
else
{
/*
* No gravity, optimize collision
*/
if (!setup.collisions)
{
return;
}
/*
* Trivial rejection...
*/
float centerDistance = size + ball2.size;
float distx = Math.Abs(position.X - ball2.position.X);
if (distx > centerDistance)
{
return;
}
float disty = Math.Abs(position.Y - ball2.position.Y);
if (disty > centerDistance)
{
return;
}
/*
* Passed trivial reject. Are we really close enough?
* We factor out sqrt() operation to speed things up, and to gain precision
*/
float centerDistanceSq = centerDistance * centerDistance;
float distSq = distx * distx + disty * disty;
if (distSq > centerDistanceSq)
{
return;
}
/*
* Do the collision!
*/
Collide(ball2, true);
}
}