protected void Stop()
{
if ( !capture )
{
// we're not captured so ignore
captureSpiro=null;
return;
}
if ( current < 0 )
// nothing selected so ignore
return;
// make sure old and new get invalidated
Invalidate(CurrentSpiro);
Invalidate(captureSpiro);
// replace current with the modified copy
spiros[current]=captureSpiro;
captureSpiro.Selected=true;
// re-enable the animation
animateTimer.Enabled=true;
// tidy up
capture=false;
captureSpiro=null;
// ensure bounds are updated and re-locate button
// (spiro may have changed size)
RecalcBounds();
UpdateFloatingButton();
}
/// Helper to invalidate a given spiro region
private void Invalidate(SpiroInstance si)
{
Rectangle rc=CanvasToClient(si.BoundingRect);
Invalidate(rc);
}
/// Add a new spiro provided
public void AddSpiro(SpiroInstance si)
{
spiros.Add(si);
si.CycleComplete+=new EventHandler(SpiroCycleComplete);
RecalcBounds();
Invalidate();
}
protected void Start(Point pt)
{
// hide the button
spiroMenuButton.Enabled=false;
spiroMenuButton.Visible=false;
if ( spiroUnderCursor < 0 && current >= 0 )
{
// deselect all spiros
// (click in region outside any spiro)
CurrentSpiro.Selected=false;
SetCurrentSpiro(-1);
Invalidate();
return;
}
pt=ClientToCanvas(pt);
if ( spiroUnderCursor != current )
{
// click on a new (different) spiro
if ( current >= 0 )
// deactivate current
CurrentSpiro.Selected=false;
// activate this one
SetCurrentSpiro(spiroUnderCursor);
CurrentSpiro.Selected=true;
// record the drag offset
dragOffset=pt;
dragOffset.Offset(-CurrentSpiro.Location.X, -CurrentSpiro.Location.Y);
// not too sure why we do this
if ( captureHitInfo == HitInfo.Curve )
captureHitInfo=HitInfo.Bounds;
// create a clone to use to draw the highlight when dragging
captureSpiro=CurrentSpiro.Clone();
Invalidate();
// all done
return;
}
if ( current < 0 )
// nothing selected so nothing to do - think this could be moved elsewhere
return;
// default case - click on current spiro
// disable the animation
// animateTimer.Enabled=false;
// record the drag offset
dragOffset=pt;
dragOffset.Offset(-CurrentSpiro.Location.X, -CurrentSpiro.Location.Y);
// record the hit info for the point clicked
captureHitInfo=CurrentSpiro.HitTest(pt, HitTestMode.Selected);
// create a clone for highlighting
captureSpiro=CurrentSpiro.Clone();
capture=true;
}
private void DrawHighlight(SpiroInstance si, Graphics g, HitInfo hi, bool showInfo)
{
// simple helper
si.DrawHighlight(g, hi);
if ( showInfo )
{
Point pt=si.FocusRect.Location;
pt.Offset(2,2);
si.DrawInfo(g, pt, Color.Gray);
}
}
public bool IntersectsAny(SpiroInstance test)
{
foreach ( SpiroInstance si in spiros )
{
if ( si.Equals(test) )
continue;
if ( si.BoundingRect.IntersectsWith(test.BoundingRect) )
{
return true;
}
}
return false;
}
private void AutoRandom(SpiroInstance si)
{
while ( true )
{
si.ResetRandom();
si.Colour=RandomColour();
si.Location=RandomLocation();
si.Speed=RandomSpeed();
si.PenWidth=RandomLineThickness();
if ( !spiroCanvas1.IntersectsAny(si) )
break;
}
}
public void Clone(SpiroInstance from)
{
// copy all properties from the other spiro
this.location=from.location;
this.R=from.R;
this.r=from.r;
this.f=from.f;
this.counter=from.counter;
// we can copy the points since they are essentially immutable
// (if this spiro is changed in any way a new array is created)
this.points=from.points;
this.penWidth=from.penWidth;
this.revolutions=from.revolutions;
this.resolution=from.resolution;
this.selected=from.selected;
this.complete=from.complete;
this.animate=from.animate;
this.repeat=from.repeat;
this.randomise=from.randomise;
this.showInfo=from.showInfo;
this.showTrace=from.ShowTrace;
this.colour=from.colour;
this.baseAngle=from.baseAngle;
this.baseMovingAngle=from.baseMovingAngle;
this.speed=from.speed;
this.MaxRandomDiameter=from.MaxRandomDiameter;
// only need to reset if we're a different type (ie. different points)
if ( this.GetType() != from.GetType() )
Reset();
// ensure the circle sizes are valid
if ( R < MinFixedRadius )
{
R=MinFixedRadius;
Reset();
}
// it's not actually necessary to do this
if ( r > MaxMovingRadius )
{
r=MaxMovingRadius;
Reset();
}
}
public void Resize(SpiroInstance current, int delta)
{
// this is a bit tricky - we need to resize both circles but give the same
// (integer) ratio between them
// in order to do this, each circle must increase/decrease by a multiple
// of GCD(r,R)/size, ie. GCD(r,R)/R or GCD(r,R)/r
// so we use the fixed circle as a base
if ( delta == 0 )
return;
int d=current.R + delta;
int multiple_R=R/GCD(r,R);
int multiple_r=r/GCD(r,R);
int new_R=(int) Math.Round((double) d/multiple_R)*multiple_R;
int new_r=new_R * multiple_r / multiple_R;
int new_f=(int) Math.Round(1.0 * f * (float) new_R / R);
if ( new_R < 5 || new_r < 5 )
// too small
return;
if ( new_R == R && new_r == r )
return;
SaveMovingAngle();
R=new_R;
r=new_r;
f=new_f;
Reset();
}