private void ParticleWindow_MouseDown(object sender, MouseEventArgs e)
{
mouseDown = true;
PrevMouse_e = e;
ForceEmitter _emitter = new ForceEmitter(e.X, e.Y, 200, 200);
//Forces
RectangleF rect = new RectangleF();
rect.X = _emitter.OuterX;
rect.Y = _emitter.OuterY;
rect.Width = _emitter.W;
rect.Height = _emitter.H;
//Top-Left Qudrant
RectangleF Q1 = new RectangleF();
Q1.X = rect.X;
Q1.Y = rect.Y;
Q1.Width = rect.Width / 2;
Q1.Height = rect.Height / 2;
//Bottom-Left Quadrant
RectangleF Q2 = new RectangleF();
Q2.X = rect.X;
Q2.Y = rect.Y + (rect.Width / 2);
Q2.Width = rect.Width / 2;
Q2.Height = rect.Height / 2;
//Top-Right
RectangleF Q3 = new RectangleF();
Q3.X = rect.X + (rect.Height / 2);
Q3.Y = rect.Y;
Q3.Width = rect.Width / 2;
Q3.Height = rect.Height / 2;
//Bottom-Right
RectangleF Q4 = new RectangleF();
Q4.X = rect.X + (rect.Height / 2);
Q4.Y = rect.Y + (rect.Width / 2);
Q4.Width = rect.Width / 2;
Q4.Height = rect.Height / 2;
for (int i = 0; i < Particle.activeParticles.Count; i++)
{
PointF point = new PointF();
point.X = Particle.activeParticles[i].x;
point.Y = Particle.activeParticles[i].y;
Particle _temp = Particle.activeParticles[i];
//If the particle is in the rectangle and it is not being pulled yet
if (rect.Contains(point) && _temp.pulled == false)
{
float rise;
float run;
float slope;
rise = _emitter.Y - _temp.y;
run = _emitter.X - _temp.x;
slope = rise / run;
//If the slope is negative trajectories get calculated differently
//Top-Left
if (slope > 0 && rise > 0 && run > 0)
{
_temp.yVel = (rise * -1) / 60;
_temp.xVel = (run * 1) / 60;
}
//Top-Right
else if (slope < 0 && rise > 0 && run < 0)
{
_temp.yVel = (rise * -1) / 60;
_temp.xVel = (run * 1) / 60;
}
//Bottom-Right
else if (slope > 0 && rise < 0 && run < 0)
{
_temp.yVel = (rise * -1) / 60;
_temp.xVel = (run * 1) / 60;
}
//Bottom-Left
else if (slope < 0 && rise < 0 && run > 0)
{
_temp.yVel = (rise * -1) / 60;
_temp.xVel = (run * 1) / 60;
}
_temp.Gravity = 0.0f;
}
//Re-Enable gravity if the particle exits the vortex
if (!rect.Contains(point))
{
_temp.pulled = false;
_temp.Gravity = -0.1f;
}
else
{
_temp.pulled = true;
}
//Hold the particle in place if it hits the emitter
if ((point.X <= (_emitter.X + _temp.w * 3) && point.X >= (_emitter.X - _temp.w * 3)) &&
point.Y <= (_emitter.Y + _temp.h * 3) && point.Y >= (_emitter.Y - _temp.h * 3))
{
_temp.x = _emitter.X;
_temp.y = _emitter.Y;
}
}
}
//On click we will generate a force that will push particles around
private void ParticleWindow_Click(object sender, MouseEventArgs e)
{
//TO do that we first create a force emitter, this will be a
//rectangular area around the mouse.
ForceEmitter _emitter = new ForceEmitter(e.X, e.Y, 400, 400);
//Center the rectangle around the emitter
RectangleF rect = new RectangleF();
rect.X = _emitter.OuterX;
rect.Y = _emitter.OuterY;
rect.Width = _emitter.W;
rect.Height = _emitter.H;
/*
* To generate forces properly for each particle, we are going to
* need to run different equations depending on where in the recangle
* the particle landed, because essentially we don't have to do a lot
* right now in terms of generating higher velocities and such, for now
* we care about changing the direction of the particle, which is simply
* swapping the sign of the particle's x and y velocities depending on
* what quadrant of the rectangle they fell into. Here we are creating
* 4 quadrants that we will test against.
*/
//Top-Left Qudrant
RectangleF Q1 = new RectangleF();
Q1.X = rect.X;
Q1.Y = rect.Y;
Q1.Width = rect.Width / 2;
Q1.Height = rect.Height / 2;
//Bottom-Left Quadrant
RectangleF Q2 = new RectangleF();
Q2.X = rect.X;
Q2.Y = rect.Y + (rect.Width / 2);
Q2.Width = rect.Width / 2;
Q2.Height = rect.Height / 2;
//Top-Right
RectangleF Q3 = new RectangleF();
Q3.X = rect.X + (rect.Height / 2);
Q3.Y = rect.Y;
Q3.Width = rect.Width / 2;
Q3.Height = rect.Height / 2;
//Bottom-Right
RectangleF Q4 = new RectangleF();
Q4.X = rect.X + (rect.Height / 2);
Q4.Y = rect.Y + (rect.Width / 2);
Q4.Width = rect.Width / 2;
Q4.Height = rect.Height / 2;
/*
* We will need to test each of the particles x and y
* positions to see which quadrant they fall into,
* while it would be nice to do this based on how much of
* the particle is inside of a quadrant then applying
* the force based on that, for the moment it feels too
* expensive to do so we will look at it later.
*/
for (int i = 0; i < Particle.activeParticles.Count; i++)
{
PointF point = new PointF();
point.X = Particle.activeParticles[i].x;
point.Y = Particle.activeParticles[i].y;
Particle _temp = Particle.activeParticles[i];
_temp.Gravity = -0.1f;
float rX = (float)rnd.Next(-5, 5);
float rY = (float)rnd.Next(-5, 5);
/*
* Below is the math we need to perform to increase
* velocity on click to apply force and to make
* sure that depending on what side/quadrant
* of the cursor the particle was in that we
* re-position the particles trajectory accordingly
*/
if (_temp.pulled == true)
{
//Reassign random x and y velocities:
rX = (float)rnd.Next(-5, 5);
rY = (float)rnd.Next(-5, 5);
rX = (float)rnd.Next(-5, 5);
rY = (float)rnd.Next(-5, 5);
rX = (float)rnd.Next(-5, 5);
rY = (float)rnd.Next(-5, 5);
_temp.pulled = false;
}
//Check Q1, xVel negative if greater than 0,
//yVel positive if less than 0
if (Q1.Contains(point))
{
_temp.xVel *= 5;
_temp.yVel *= 5;
if (_temp.xVel > 0)
{
_temp.xVel = _temp.xVel * -1;
}
if (_temp.yVel < 0)
{
_temp.yVel = _temp.yVel * 1;
}
}
//Check Q2, xVel negative if greater than 0,
//yVel negative if greater than 0
if (Q2.Contains(point))
{
_temp.xVel *= 5;
_temp.yVel *= 5;
if (_temp.xVel > 0)
{
_temp.xVel = _temp.xVel * -1;
}
if (_temp.yVel > 0)
{
_temp.yVel = _temp.yVel * -1;
}
}
//Check Q3, xVel positive is less than 0,
//yVel positive if less than 0
if (Q3.Contains(point))
{
_temp.xVel *= 5;
_temp.yVel *= 5;
if (_temp.xVel < 0)
{
_temp.xVel = _temp.xVel * 1;
}
if (_temp.yVel < 0)
{
_temp.yVel = _temp.yVel * 1;
}
}
//Check Q4, xVel negative if less than zero and yVel negative
//if greater than 0
if (Q4.Contains(point))
{
_temp.xVel *= 5;
_temp.yVel *= 5;
if (_temp.xVel < 0)
{
_temp.xVel = _temp.xVel * -1;
}
if (_temp.yVel > 0)
{
_temp.yVel = _temp.yVel * -1;
}
}
}
mouseDown = false;
}