Hello, during forensics we have been taught about the patterns and how to calculate blood splatter. Blood spatter has two parts, the base, and the spine, the spine is the spikes that emerge from the blood, the spine is useful because it can determine how much energy was in the blood for example blood with no spines would most likely be from down to the knee while blood with vast spines the blood should have come off the head. the base is useful for calculating which direction the blood came from by measuring the width and length and putting it in this formula: Sin-1 (width/length) = answer.
Here is the work I have done on about blood splatters.