![]() ![]() A structural method determines which pixels should be set before drawing the line a conditional method tests certain conditions to find which pixel should be set next.Ī polygon is a closed area of image bounded by straight or curved lines and filled with one solid color. Straight lines can be developed in two different ways. In computer graphics, straight line is so basic in creating images that we call it a graphics primitive. Line, especially straight lines, constitute the basic building block of Line graphs, bar and pie charts, two and three-dimensional graphs of mathematical functions, engineering drawings and architectural plans. Pixel ratio should be considered in line-generating algorithms. The ratio of the distance between the centres of two adjacent horizontal pixels to that of the vertical ones is called the pixel ratio. ![]() A resolution of 100 dots lines/inch implies a dot size of 0.01 inch. The resolution of CRT is related to the dot size, the diameter of a single dot. Though it has no structure, it is definitely a building block and hence it can be considered as the graphics primitive. It is just one tiny dot on the raster displays. The most basic of these elmental structures is the pixel, short for picture element.Ī pixel is a point of light. Graphics is constructed from three basic elements, as opposed to the great variety of graphics applications. Graphics Primitive is a basic object that is essential for the creation or construction of complex images.
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