A system and method for spray gun or nozzle control wherein the spray gun liquid discharge pattern is dynamically varied to correspond to the dimensions of a moving target object or a portion of the moving target. The spray gun includes inputs for fan air, atomizing air, and liquid, as well as cylinder air. Upon detection of a target object approaching, such as on a conveyor belt, the fan air pressure, atomizing air pressure, liquid pressure, and cylinder air pressure are varied according to predefined or contemporaneously generated curves to provide a spray pattern that corresponds to the shape of the target object or portion of the target object, thus minimizing waste and inefficiency due to overspray.