java/examples/Topics/File IO/SaveManyImages/SaveManyImages.pde

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+/**
+ * Save Many Images. 
+ * 
+ * The saveFrame() function allows you to save images from
+ * a program while it is running. This example saves the first
+ * 50 frames of a program. These images can be imported into
+ * animation software or QuickTime and then saved as a movie.
+ */
+
+float x = 33;
+float numFrames = 50;
+
+void setup() 
+{
+  size(200, 200);
+  smooth();
+  noStroke();
+}
+
+void draw() 
+{
+  background(0);
+  x += random(-2, 2);
+  ellipse(x, 100, 80, 80);
+  if (frameCount <= numFrames) {
+    saveFrame("circles-####.tif");
+  }
+}