Initial Commit

Java/Processing/processing-3.3.6/modes/java/examples/Basics/Data/TrueFalse/TrueFalse.pde

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+/**
+ * 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);
+  }
+}