Initial Commit

Java/Processing/processing-3.3.6/modes/java/examples/Topics/Geometry/Vertices/Vertices.pde

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+/**
+ * Vertices 
+ * by Simon Greenwold.
+ * 
+ * Draw a cylinder centered on the y-axis, going down 
+ * from y=0 to y=height. The radius at the top can be 
+ * different from the radius at the bottom, and the 
+ * number of sides drawn is variable.
+ */
+
+void setup() {
+  size(640, 360, P3D);
+}
+
+void draw() {
+  background(0);
+  lights();
+  translate(width / 2, height / 2);
+  rotateY(map(mouseX, 0, width, 0, PI));
+  rotateZ(map(mouseY, 0, height, 0, -PI));
+  noStroke();
+  fill(255, 255, 255);
+  translate(0, -40, 0);
+  drawCylinder(10, 180, 200, 16); // Draw a mix between a cylinder and a cone
+  //drawCylinder(70, 70, 120, 64); // Draw a cylinder
+  //drawCylinder(0, 180, 200, 4); // Draw a pyramid
+}
+
+void drawCylinder(float topRadius, float bottomRadius, float tall, int sides) {
+  float angle = 0;
+  float angleIncrement = TWO_PI / sides;
+  beginShape(QUAD_STRIP);
+  for (int i = 0; i < sides + 1; ++i) {
+    vertex(topRadius*cos(angle), 0, topRadius*sin(angle));
+    vertex(bottomRadius*cos(angle), tall, bottomRadius*sin(angle));
+    angle += angleIncrement;
+  }
+  endShape();
+  
+  // If it is not a cone, draw the circular top cap
+  if (topRadius != 0) {
+    angle = 0;
+    beginShape(TRIANGLE_FAN);
+    
+    // Center point
+    vertex(0, 0, 0);
+    for (int i = 0; i < sides + 1; i++) {
+      vertex(topRadius * cos(angle), 0, topRadius * sin(angle));
+      angle += angleIncrement;
+    }
+    endShape();
+  }
+
+  // If it is not a cone, draw the circular bottom cap
+  if (bottomRadius != 0) {
+    angle = 0;
+    beginShape(TRIANGLE_FAN);
+
+    // Center point
+    vertex(0, tall, 0);
+    for (int i = 0; i < sides + 1; i++) {
+      vertex(bottomRadius * cos(angle), tall, bottomRadius * sin(angle));
+      angle += angleIncrement;
+    }
+    endShape();
+  }
+}