QuickDraw was grounded in the Apple Lisa's LisaGraf of the early 1980s and was designed to fit well with the Pascal-based interfaces and development environments of the early Apple systems.
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In addition, QuickDraw was a raster graphics system, which defines the pixel as its basic unit of graphical information. abeMeda quickly catalogs your photos, audio files, or any other media and data files, hard disks, USB sticks, server volumes, DVD-ROMs, CD-ROMs, and anything that spins. This is in contrast to vector graphics systems, where graphics primitives are defined in mathematical terms and rasterized as required to the display resolution. A raster system requires much less processing power however, and was the prevailing paradigm at the time that QuickDraw was developed. QuickDraw defined a key data structure, the graphics port, or GrafPort. This wonderful book is illustrated with examples throughout and explains the six golden rules for making automata alongside detailed step-by-step projects. This was a logical drawing area where graphics could be drawn. Materials such as paper and card, wood, wire, tinplate and plastics are covered along with mechanisms - levers and linkages, cranks and cams, wheels, gears, pulleys, springs, ratchets and pawls. The most obvious on-screen "object" corresponding to a GrafPort was a window, but the entire desktop view could be a GrafPort, and off-screen ports could also exist. The GrafPort defined a coordinate system. In QuickDraw, this had a resolution of 16 bits, giving 65,536 unique vertical and horizontal locations. These are numbered from -32,767 on the extreme left (or top), to +32,767 on the extreme right (or bottom). A window's content area did not include the window's frame, drop shadow or title bar (if any).Ī window was usually set up so that the top, left corner of its content area was located at 0,0 in the associated GrafPort. QuickDraw coordinates referred to the infinitely thin lines between pixel locations. An actual pixel was drawn in the space to the immediate right and below the coordinate.
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