/**
* Returns 1 if the center sprite is getting too close to the right edge,
* Returns -1 if the center sprite is getting too close to the left edge
* Returns 0 if the center sprite is not near any edge
*/
private int isDisplacedX()
{
if (centerSprite.getX() + centerSprite.getImage().Width + displacementX + center_X_Displacement > output.Width)
{
return(-1);
}
else if (centerSprite.getX() + displacementX < center_X_Displacement && displacementX < 0)
{
return(1);
}
else
{
return(0);
}
}
/**
* Combines all images in the queue onto the output image
* Starts with a clean background each time
* Images appear stacked on top of each other, with the last added to the
* queue on top
* Sprites are rendered first, text is always rendered last
*
* (Note by Nathan, this method could be optimized (?*) to distribute
* the load of drawing each sprite in the queue to instead be done
* whenever a sprite is added. *Wouldn't change the total time needed.)
* @author Nathan Swartz, Benjamin Lippincott
*/
public void Render()
{
if (this.hasChanged)
{
Graphics g = Graphics.FromImage(output);
g.DrawImage(background, 0, 0);
calculateDisplacement();
// render each renderable's sprite that is displaying
foreach (KeyValuePair <int, LinkedList <Renderable> > kvp in layers)
{
foreach (Renderable renderable in kvp.Value)
{
if (renderable.isDisplaying())
{
ISprite s = renderable.getSprite();
g.DrawImage(s.getImage(),
s.getX() + displacementX,
s.getY() + displacementY);
}
}
}
// render each text overlay, on top of every other layer
foreach (TextOverlay t in texts)
{
using (Font f = t.getFont())
{
g.DrawString(t.getMessage(), f, Brushes.Black, new PointF(t.getX(), t.getY()));
}
}
g.Dispose();
this.hasChanged = false;
}
}