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Building interactive systems: principles for human-computer by Dan R . Olsen , Jr

By Dan R . Olsen , Jr

This cutting edge textual content specializes in the architectures, arithmetic, and algorithms which are necessary to making trustworthy person interfaces. the 1st 16 chapters disguise the ideas required for present graphical person interfaces, together with particular emphasis at the Model-View-Controller structure. the second one a part of the ebook offers an summary of key learn components in interactive structures, with a spotlight at the algorithms required to enforce those structures. utilizing transparent descriptions, equations,and pseudocode, this article simplifies and demystifies the advance and alertness of various consumer interfaces.

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Then, the entire layer image is rendered with the layer’s alpha value. The application program need not see this step because the paint() method sees only a Graphics object. It does not care if the Graphics object is a layer image or anything else. 26 C H A P T E R 2 • Drawing DRAWING MODELS The basic drawing model for all images is a rectangular array of pixels with each pixel having a color. This is how display screens, printers, and image files are all structured. All drawing models must eventually convert their representations into pixel colors.

We need a line that has thickness so that we can see it and we need to vary that thickness to create various weights of lines. The reality is that all strokes actually define regions of pixels. It is convenient to think about a line being one pixel wide, but this causes many problems. The first is when printing. A line one pixel wide might appear well on the screen, but when printed, one pixel wide on a 600 dots per inch printer appears very faint and thin. 11, a line is actually a polygonal region.

0, there is no background color, only object color. 0, there is no object color. 5 mixes object and background colors equally. There are other compositing functions besides the one described previously. Duff and Porter2 defined a set of 12 compositing operators. The one described previously is their A atop B operator. Many systems specify color as RGBA, where A is for alpha channel. The alpha channel is the opacity information. An alpha value of 0 is completely transparent and a value of 1 (or sometimes 255) is completely opaque.

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