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A Boolean variable has only two possible values: true or false. It is common to use Booleans with control statements to determine the flow of a program. In this example, when the boolean value "x" is true, vertical black lines are drawn and when the boolean value "x" is false, horizontal gray lines are drawn.

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Copy Open In Processing/** * True/False. * * A Boolean variable has only two possible values: true or false. * It is common to use Booleans with control statements to * determine the flow of a program. In this example, when the * boolean value "x" is true, vertical black lines are drawn and when * the boolean value "x" is false, horizontal gray lines are drawn. */ boolean b = false; size(640, 360); background(0); stroke(255); int d = 20; int middle = width/2; for (int i = d; i <= width; i += d) { if (i < middle) { b = true; } else { b = false; } if (b == true) { // Vertical line line(i, d, i, height-d); } if (b == false) { // Horizontal line line(middle, i - middle + d, width-d, i - middle + d); } }

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This example is for Processing 4+. If you have a previous version, use the examples included with your software. If you see any errors or have suggestions, please let us know.

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