Add SVG export examples for various scenarios

Author: hxrshxz

java/libraries/svg/examples/NoScreenDisplay/NoScreenDisplay.pde

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+/**
+ * SVG Export (No Screen Display)
+ * 
+ * This example draws a single frame to a SVG file and quits. 
+ * (Note that no display window will open; this helps when you're 
+ * trying to create massive SVG images that are far larger than 
+ * the screen size.)
+ */
+
+import processing.svg.*;
+
+void setup() {
+  size(400, 400, SVG, "filename.svg");
+}
+
+void draw() {
+  // Draw something good here
+  line(0, 0, width/2, height);
+
+  // Exit the program
+  println("Finished.");
+  exit();
+}

java/libraries/svg/examples/SingleFrameFromAnimation/SingleFrameFromAnimation.pde

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+/**
+ * Single Frame from an Animation (With Screen Display)
+ * 
+ * It's also possible to save one frame from a program with 
+ * moving elements. Create a boolean variable to turn the SVG 
+ * recording process on and off.
+ */
+
+import processing.svg.*;
+
+boolean record;
+
+void setup() {
+  size(400, 400);
+}
+
+void draw() {
+  if (record) {
+    // Note that #### will be replaced with the frame number. Fancy!
+    beginRecord(SVG, "frame-####.svg");
+  }
+
+  // Draw something good here
+  background(255);
+  line(mouseX, mouseY, width/2, height/2);
+
+  if (record) {
+    endRecord();
+    record = false;
+  }
+}
+
+// Use a mouse press so thousands of files aren't created
+void mousePressed() {
+  record = true;
+}

java/libraries/svg/examples/ThreeDGeometry/ThreeDGeometry.pde

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+/**
+ * SVG Files from 3D Geometry (With Screen Display)
+ * 
+ * To create vectors from 3D data, use the beginRaw() and 
+ * endRaw() commands. These commands will grab the shape data 
+ * just before it is rendered to the screen. At this stage, 
+ * your entire scene is nothing but a long list of lines and 
+ * triangles. This means that a shape created with sphere() 
+ * method will be made up of hundreds of triangles, rather 
+ * than a single object.
+ * 
+ * When using beginRaw() and endRaw(), it's possible to write 
+ * to either a 2D or 3D renderer. For instance, beginRaw() 
+ * with the SVG library will write the geometry as flattened 
+ * triangles and lines.
+ */
+
+import processing.svg.*;
+
+boolean record;
+
+void setup() {
+  size(500, 500, P3D);
+}
+
+void draw() {
+  if (record) {
+    beginRaw(SVG, "output.svg");
+  }
+
+  // Do all your drawing here
+  background(204);
+  translate(width/2, height/2, -200);
+  rotateZ(0.2);
+  rotateY(mouseX/500.0);
+  box(200);
+
+  if (record) {
+    endRaw();
+    record = false;
+  }
+}
+
+// Hit 'r' to record a single frame
+void keyPressed() {
+  if (key == 'r') {
+    record = true;
+  }
+}

java/libraries/svg/examples/UsingCreateGraphics/UsingCreateGraphics.pde

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+/**
+ * Using createGraphics() to Create an SVG File
+ * 
+ * To write a SVG file using only the createGraphics() command, 
+ * rather than as part of a sketch, it's necessary to call 
+ * dispose() on the PGraphicsSVG object. This is the same as 
+ * calling exit(), but it won't quit the sketch.
+ */
+
+import processing.svg.*;
+
+PGraphics svg = createGraphics(300, 300, SVG, "output.svg");
+svg.beginDraw();
+svg.background(128, 0, 0);
+svg.line(50, 50, 250, 250);
+svg.dispose();
+svg.endDraw();

java/libraries/svg/examples/WithScreenDisplay/WithScreenDisplay.pde

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+/**
+ * SVG Export (With Screen Display)
+ * 
+ * To draw to the screen while also saving an SVG, use the 
+ * beginRecord() and endRecord() functions. Unlike the PDF 
+ * renderer, the SVG renderer will only save the final frame 
+ * of a sequence. This is slower, but is useful when you need 
+ * to see what you're working on as it saves.
+ */
+
+import processing.svg.*;
+
+void setup() {
+  size(400, 400);
+  noLoop();
+  beginRecord(SVG, "filename.svg");
+}
+
+void draw() {
+  // Draw something good here
+  line(0, 0, width/2, height);
+
+  endRecord();
+}