Gallery3D中画图时调用glTranslate函数参数赋值过程
GridDrawManager::drawDisplayItem(RenderView view, GL11 gl, DisplayItem displayItem, Texture texture, int pass,Texture previousTexture, float mixRatio) 函数有下面几句：
int currentlyVisibleSlotIndex = getAnchorSlotIndex(ANCHOR_CENTER);->anchorItem = displayItem.mItemRef;-> newSlotIndex = i;->if (currentAnchorSlotIndex != Shared.INVALID && newAnchorSlotIndex != Shared.INVALID) { layout.getPositionForSlotIndex(newAnchorSlotIndex, itemWidth, itemHeight, deltaAnchorPosition); oldLayout.getPositionForSlotIndex(currentAnchorSlotIndex, itemWidth, itemHeight, currentSlotPosition); currentSlotPosition.subtract(sDeltaAnchorPosition); deltaAnchorPosition.subtract(currentSlotPosition); deltaAnchorPosition.y = 0; deltaAnchorPosition.z = 0; }