private void CheckCollisions(Projectile projectile, GsPolygon projectilePolygon, UpdateParams uparams)
{
// if the projectile parent is null, then don't worry about it
if (projectile.Parent == null)
{
return;
}
// cycle through all of the entities
for (int i = mInvaders.Count - 1; i > -1; --i)
{
// get the entity
Invader invader = mInvaders[i];
// if this invader isn't the type of invader that the projectile can hit, then keep going
if (!projectile.CanHit(invader))
{
continue;
}
// get the entity polygon
GsPolygon entityPolygon = invader.GetHull(uparams.Offset);
// let the entity and polygon know they were attacked
if (entityPolygon.IntersectsWith(projectilePolygon))
{
// let the projectile know it collided
projectile.OnCollidedWithInvader(invader);
// let the entity know it was attacked
invader.OnAttackedByProjectile(projectile);
}
}
}
/// <summary>
///
/// </summary>
public Sprite()
{
Orientation = 0f;
Bounds = GsRectangle.Empty;
previousBounds = Bounds;
hullCache = null;
VelocityFactor = GsVector.One;
Origin = GsVector.Zero;
}
/// <summary></summary>
public GsPolygon GetHull(GsVector offset)
{
GsVector[] polygon = GetImageHull();
if (hullCache == null || Bounds != previousBounds)
{
GsMatrix transform = CreateTransform(GetTextureDrawData(offset));
hullCache = new GsPolygon(polygon, transform);
previousBounds = Bounds;
}
return(hullCache);
}
private void DrawProjectiles(DrawParams dparams)
{
foreach (Projectile projectile in mProjectiles)
{
switch (dparams.FillMode)
{
case GridFillMode.Polygons:
{
GsPolygon hull = projectile.GetHull(dparams.Offset);
dparams.Graphics.DrawPolygon(GsColor.Red, hull.Points);
break;
}
case GridFillMode.Solid:
{
projectile.Draw(dparams);
break;
}
}
}
}
private void DrawInvaders(DrawParams dparams)
{
foreach (Invader invader in mInvaders)
{
switch (dparams.FillMode)
{
case GridFillMode.Polygons:
{
GsPolygon hull = invader.GetHull(dparams.Offset);
dparams.Graphics.DrawPolygon(GsColor.Yellow, hull.Points);
break;
}
case GridFillMode.Solid:
{
invader.Draw(dparams);
break;
}
}
}
}
private void UpdateProjectiles(UpdateParams uparams)
{
float dx = CellWidth * 2f;
float dy = CellHeight * 2f;
GsRectangle viewport = new GsRectangle(X - dx, Y - dy, Width + dx, Height + dy);
for (int i = mProjectiles.Count - 1; i > -1; --i)
{
// get the projectile
Projectile projectile = mProjectiles[i];
// update the projectile data
projectile.Update(uparams.Elapsed);
// get the polygon data
GsPolygon polygon = projectile.GetHull(uparams.Offset);
// if the projectile is still alive, check to see if it went out of bounds
if (projectile.IsAlive)
{
bool projectileIntersectsWithBounds = viewport.IntersectsWith(projectile.Bounds);
bool projectileInsideBounds = viewport.Contains(projectile.Bounds);
projectile.IsAlive = projectile.StayAlive || (projectileInsideBounds || projectileIntersectsWithBounds);
}
// if the projectile is still alive, check to see if it hit anything
if (projectile.IsAlive)
{
CheckCollisions(projectile, polygon, uparams);
}
// if the projectile is dead, then remove it from the list
if (!projectile.IsAlive)
{
mProjectiles.RemoveAt(i);
OnProjectileRemoved(projectile);
}
}
}
private void DrawPieces(DrawParams dparams)
{
foreach (Piece piece in mPieces)
{
switch (dparams.FillMode)
{
case GridFillMode.Polygons:
{
GsPolygon hull = piece.GetHull(dparams.Offset);
dparams.Graphics.DrawPolygon(GsColor.Blue, hull.Points);
break;
}
case GridFillMode.Solid:
{
piece.Draw(dparams);
break;
}
}
}
mSelection.Draw(dparams);
}
