docs: add isLooping() reference

content/references/examples/processing/isLooping_/isLooping_0.pde

@@ -0,0 +1,21 @@
+void setup() {
+  size(200, 200);
+  noLoop();
+}
+
+void draw() {
+  background(204);
+  if (isLooping()) {
+    line(0, 0, width, height);
+  } else {
+    line(0, height, width, 0);
+  }
+}
+
+void mousePressed() {
+  if (isLooping()) {
+    noLoop();
+  } else {
+    loop();
+  }
+}

content/references/translations/en/processing/isLooping_.json

@@ -0,0 +1,12 @@
+{
+  "brief": "Reports whether the sketch is continuously executing the code within <b>draw()</b>",
+  "related": ["loop_", "noLoop_", "draw_"],
+  "name": "isLooping()",
+  "description": "Returns <b>true</b> if Processing is continuously executing the code within <b>draw()</b>, and <b>false</b> after <b>noLoop()</b> has been called. Calling <b>loop()</b> resumes continuous execution and <b>isLooping()</b> will return <b>true</b> again.",
+  "syntax": ["isLooping()"],
+  "returns": "boolean",
+  "type": "function",
+  "category": "structure",
+  "subcategory": "",
+  "parameters": []
+}

content/references/translations/en/processing/loop_.json

@@ -1,6 +1,6 @@
 {
   "brief": "Causes Processing to continuously execute the code within\n           <b>draw()</b>",
-  "related": ["noLoop_", "redraw_", "draw_"],
+  "related": ["noLoop_", "isLooping_", "redraw_", "draw_"],
   "name": "loop()",
   "description": "By default, Processing loops through <b>draw()</b> continuously, executing\n the code within it. However, the <b>draw()</b> loop may be stopped by calling\n <b>noLoop()</b>. In that case, the <b>draw()</b> loop can be resumed with\n <b>loop()</b>.",
   "syntax": ["loop()"],

content/references/translations/en/processing/noLoop_.json

@@ -1,6 +1,6 @@
 {
   "brief": "Stops Processing from continuously executing the code within <b>draw()</b>",
-  "related": ["loop_", "redraw_", "draw_"],
+  "related": ["loop_", "isLooping_", "redraw_", "draw_"],
   "name": "noLoop()",
   "description": "Stops Processing from continuously executing the code within\n <b>draw()</b>. If <b>loop()</b> is called, the code in <b>draw()</b>\n begin to run continuously again. If using <b>noLoop()</b> in\n <b>setup()</b>, it should be the last line inside the block.\n <br/> <br/>\n When <b>noLoop()</b> is used, it's not possible to manipulate or access\n the screen inside event handling functions such as <b>mousePressed()</b>\n or <b>keyPressed()</b>. Instead, use those functions to call\n <b>redraw()</b> or <b>loop()</b>, which will run <b>draw()</b>, which\n can update the screen properly. This means that when noLoop() has been\n called, no drawing can happen, and functions like saveFrame() or\n loadPixels() may not be used.\n <br/> <br/>\n Note that if the sketch is resized, <b>redraw()</b> will be called to\n update the sketch, even after <b>noLoop()</b> has been specified.\n Otherwise, the sketch would enter an odd state until <b>loop()</b> was called.",
   "syntax": ["noLoop()"],