@Override
protected void draw(final GLState pGLState, final Camera pCamera) {
final int tileColumns = this.mTileColumns;
final int tileRows = this.mTileRows;
final int tileWidth = this.mTMXTiledMap.getTileWidth();
final int tileHeight = this.mTMXTiledMap.getTileHeight();
final float scaledTileWidth = tileWidth * this.mScaleX;
final float scaledTileHeight = tileHeight * this.mScaleY;
final float[] cullingVertices = this.mCullingVertices;
RectangularShapeCollisionChecker.fillVertices(
0, 0, this.mWidth, this.mHeight, this.getLocalToSceneTransformation(), cullingVertices);
final float layerMinX = cullingVertices[SpriteBatch.VERTEX_INDEX_X];
final float layerMinY = cullingVertices[SpriteBatch.VERTEX_INDEX_Y];
final float cameraMinX = pCamera.getXMin();
final float cameraMinY = pCamera.getYMin();
final float cameraWidth = pCamera.getWidth();
final float cameraHeight = pCamera.getHeight();
/* Determine the area that is visible in the camera. */
final float firstColumnRaw = (cameraMinX - layerMinX) / scaledTileWidth;
final int firstColumn =
MathUtils.bringToBounds(0, tileColumns - 1, (int) Math.floor(firstColumnRaw));
final int lastColumn =
MathUtils.bringToBounds(
0, tileColumns - 1, (int) Math.ceil(firstColumnRaw + cameraWidth / scaledTileWidth));
final float firstRowRaw = (cameraMinY - layerMinY) / scaledTileHeight;
final int firstRow = MathUtils.bringToBounds(0, tileRows - 1, (int) Math.floor(firstRowRaw));
final int lastRow =
MathUtils.bringToBounds(
0, tileRows - 1, (int) Math.floor(firstRowRaw + cameraHeight / scaledTileHeight));
for (int row = firstRow; row <= lastRow; row++) {
for (int column = firstColumn; column <= lastColumn; column++) {
this.mSpriteBatchVertexBufferObject.draw(
GLES20.GL_TRIANGLE_STRIP,
this.getSpriteBatchIndex(column, row) * SpriteBatch.VERTICES_PER_SPRITE,
SpriteBatch.VERTICES_PER_SPRITE);
}
}
}
