1. A computer-implemented method for rendering a parameterized graphic annotation using a computer programmed to perform the computer-implemented method, the computer having a processor, the method comprising: providing a block diagram modeling environment for creating and simulating an electronic version of a system diagram; providing an executable block diagram model that graphically represents a dynamic system in the block diagram modeling environment, the executable block diagram model being represented schematically in the block diagram modeling environment as a collection of graphical blocks interconnected by signals; generating a block for the block diagram model for annotating an image with a parameterized graphic annotation, the block when executed causing an image that is input into the block to be annotated with the parameterized graphical annotation, some or all of the parameterized graphical annotation being either input into the block or generated by the block; and incorporating the generated block into the block diagram model.