public final boolean collidesWith(Sprite otherSprite) {
if (otherSprite == null) {
throw new NullPointerException();
}
// only check collision if both are visible
if (!otherSprite.isVisible() || !this.isVisible()) return false;
return collidesWith(otherSprite, 0, 0);
}
public Sprite(Sprite otherSprite) {
// copy the otherSprite
super(
otherSprite.getX(),
otherSprite.getY(),
otherSprite.getWidth(),
otherSprite.getHeight(),
otherSprite.isVisible());
this.frame = otherSprite.frame;
this.sequence = otherSprite.sequence;
this.cols = otherSprite.cols;
this.rows = otherSprite.rows;
this.transform = otherSprite.transform;
this.img = otherSprite.img;
this.collX = otherSprite.collX;
this.collY = otherSprite.collY;
this.collWidth = otherSprite.collWidth;
this.collHeight = otherSprite.collHeight;
tilesTextRegions = img.split((int) getWidth(), (int) getHeight());
}
/**
* Helper methods that check for collisions They are at the end of the file because of the length
* of the code
*
* <p>For both methods, the second and third parameters are significant only if o is an Bitmap,
* otherwise they are ignored
*/
private synchronized boolean collidesWith(Object o, int oX, int oY) {
int tX = 0, tY = 0, tW = 0, tH = 0;
int oW = 0, oH = 0;
Sprite t = this;
boolean another = true;
while (another) {
int sX, sY, sW, sH;
int cX = t.collX;
int cY = t.collY;
int cW = t.collWidth;
int cH = t.collHeight;
// if there is a zero in a dimension
// then it cannot intersect with anything!
if (cW == 0 || cH == 0) {
return false;
}
switch (t.transform) {
case TRANS_NONE:
sX = (int) (t.getX() + cX);
sY = (int) (t.getY() + cY);
sW = cW;
sH = cH;
break;
case TRANS_MIRROR_ROT180:
sX = (int) (t.getX() + cX);
sY = (int) (t.getY() + (t.getHeight() - cY - 1) - cH);
sW = cW;
sH = cH;
break;
case TRANS_MIRROR:
sX = (int) (t.getX() + (t.getWidth() - cX - 1) - cW);
sY = (int) (t.getY() + cY);
sW = cW;
sH = cH;
break;
case TRANS_ROT180:
sX = (int) (t.getX() + (t.getWidth() - cX - 1) - cW);
sY = (int) (t.getY() + (t.getHeight() - cY - 1) - cH);
sW = cW;
sH = cH;
break;
case TRANS_MIRROR_ROT270:
sX = (int) (t.getX() + cY);
sY = (int) (t.getY() + cX);
sW = cH;
sH = cW;
break;
case TRANS_ROT90:
sX = (int) (t.getX() + (t.getHeight() - cY - 1) - cH);
sY = (int) (t.getY() + cX);
sW = cH;
sH = cW;
break;
case TRANS_MIRROR_ROT90:
sX = (int) (t.getX() + (t.getHeight() - cY - 1) - cH);
sY = (int) (t.getY() + (t.getWidth() - cX - 1) - cW);
sW = cH;
sH = cW;
break;
case TRANS_ROT270:
sX = (int) (t.getX() + cY);
sY = (int) (t.getY() + (t.getWidth() - cX - 1) - cW);
sW = cH;
sH = cW;
break;
default: // cant really happen, but the return keeps the
// compiler happy (otherwise it'll report variable
// may not be initialized)
return false;
}
if (o != t) {
tX = sX;
tY = sY;
tW = sW;
tH = sH;
if (o instanceof Sprite) {
// two sprites first round
// another = true;
t = (Sprite) o;
} else if (o instanceof TiledLayer) {
another = false;
TiledLayer layer = (TiledLayer) o;
oX = (int) (layer.getX());
oY = (int) (layer.getY());
oW = (int) (layer.getWidth());
oH = (int) (layer.getHeight());
} else { // o instanceof lcdui.Bitmap
another = false;
TextureRegion img = (TextureRegion) o;
oW = img.getRegionWidth();
oH = img.getRegionHeight();
}
} else {
another = false;
// two sprites
// second round
oX = sX;
oY = sY;
oW = sW;
oH = sH;
}
}
// if there is no intersection
// we know there is no collision
if (tX > oX && tX >= oX + oW) return false;
else if (tX < oX && tX + tW <= oX) return false;
else if (tY > oY && tY >= oY + oH) return false;
else if (tY < oY && tY + tH <= oY) return false;
if (o instanceof TiledLayer) {
// if o is a tiledLayer then
// it is possible to have not a
// collision if every intersection tile
// has a zero value
TiledLayer layer = (TiledLayer) o;
// this is the intersection of the two rectangles
int rX, rY, rW, rH;
if (oX > tX) {
rX = oX;
rW = ((oX + oW < tX + tW) ? oX + oW : tX + tW) - rX;
} else {
rX = tX;
rW = ((tX + tW < oX + oW) ? tX + tW : oX + oW) - rX;
}
if (oY > tY) {
rY = oY;
rH = ((oY + oH < tY + tH) ? oY + oH : tY + tH) - rY;
} else {
rY = tY;
rH = ((tY + tH < oY + oH) ? tY + tH : oY + oH) - rY;
}
int lW = layer.getCellWidth();
int lH = layer.getCellHeight();
int minC = (rX - oX) / lW;
int minR = (rY - oY) / lH;
int maxC = (rX - oX + rW - 1) / lW;
int maxR = (rY - oY + rH - 1) / lH;
// travel across all cells in the collision
// rectangle
for (int row = minR; row <= maxR; row++) {
for (int col = minC; col <= maxC; col++) {
int cell = layer.getCell(col, row);
// if cell is animated get current
// associated static tile
if (cell < 0) cell = layer.getAnimatedTile(cell);
if (cell != 0) return true;
}
}
// if no non zero cell was found
// there is no collision
return false;
} else {
// if the other object is an image or sprite
// collision happened
return true;
}
}
