moving the OpenGL examples to the core

2026-06-16 04:26:26 +02:00 · 2012-07-20 20:24:58 +00:00
parent b30328bb66
commit 40ecd562e3
133 changed files with 0 additions and 0 deletions
@@ -0,0 +1,45 @@
+/**
+ * TRIANGLE_STRIP Mode
+ * by Ira Greenberg. 
+ * 
+ * Generate a closed ring using the vertex() function and 
+ * beginShape(TRIANGLE_STRIP) mode. The outerRad and innerRad 
+ * variables control ring's radii respectively.
+ */
+
+int x;
+int y;
+float outerRad;
+float innerRad;
+
+void setup() {
+  size(640, 360, P2D);
+  smooth(4);
+  background(204);
+  x = width/2;
+  y = height/2;
+  outerRad = min(width, height) * 0.4;
+  innerRad = outerRad * 0.6;
+}
+
+void draw() {
+  background(204);
+  
+  int pts = int(map(mouseX, 0, width, 6, 60));
+  float rot = 180.0/pts;
+  float angle = 0;
+  
+  beginShape(TRIANGLE_STRIP); 
+  for (int i = 0; i <= pts; i++) {
+    float px = x + cos(radians(angle)) * outerRad;
+    float py = y + sin(radians(angle)) * outerRad;
+    angle += rot;
+    vertex(px, py);
+    px = x + cos(radians(angle)) * innerRad;
+    py = y + sin(radians(angle)) * innerRad;
+    vertex(px, py); 
+    angle += rot;
+  }
+  endShape();
+}
+