implemented clipping in PGraphicsAndroid2D, fix #288

Author: codeanticode

core/src/processing/a2d/PGraphicsAndroid2D.java

@@ -512,6 +512,25 @@ public void endShape(int mode) {
   }
 
 
+  //////////////////////////////////////////////////////////////
+
+  // CLIPPING
+
+
+  @Override
+  protected void clipImpl(float x1, float y1, float x2, float y2) {
+//    canvas.save(Canvas.CLIP_SAVE_FLAG);
+    canvas.clipRect(x1, y1, x2, y2);
+  }
+
+
+  @Override
+  public void noClip() {
+    canvas.clipRect(0, 0, width, height, Region.Op.REPLACE);
+//    canvas.restore();
+  }
+
+
   //////////////////////////////////////////////////////////////
 
   // BEZIER VERTICES