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Mastering openFrameworks: Creative Coding Demystified by Denis Perevalov

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The background color of the screen

The drawing on the screen in openFrameworks should be performed in the testApp::draw() function (see the testApp.cpp section in Chapter 1, openFrameworks Basics). Before this function is called by openFrameworks, the entire screen is filled with a fixed color, which is set by the function ofSetBackground( r, g, b ). Here r, g, and b are integer values corresponding to red, green, and blue components of the background color in the range 0 to 255. Note that each of the ofSetBackground() function call fills the screen with the specified color immediately.

Tip

You can make a gradient background using the ofBackgroundGradient() function. See its description in the The triangles cloud example section in Chapter 7,

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