Data commit

Task/Sierpinski-pentagon/Processing/sierpinski-pentagon.processing

@@ -0,0 +1,40 @@
+float s_angle, scale, margin = 25, total = 4;
+float p_size = 700;
+float radius = p_size/2-2*margin;
+float side = radius * sin(PI/5)*2;
+
+void setup() {
+  float temp = width/2;
+  size(590, 590);
+  background(0, 0, 200);
+  stroke(255);
+  s_angle = 72*PI/180;
+  scale = 1/(2+cos(s_angle)*2);
+  for (int i = 0; i < total; i++) {
+    background(0, 0, 200);
+    drawPentagon(width/2, (height-p_size)/2 + 3*margin, side, total);
+  }
+}
+
+void drawPentagon(float x, float y, float side, float depth) {
+  float angle = 3*s_angle;
+  if (depth == 0) {
+    for (int i = 0; i < 5; i++) {
+      float px = x;
+      float py = y;
+      x = x+cos(angle)*side;
+      y = y-sin(angle)*side;
+      line(x, y, px, py);
+      angle += s_angle;
+    }
+  } else {
+    side *= scale;
+    float distance = side+side*cos(s_angle)*2;
+    for (int j = 0; j < 5; j++) {
+      x = x+cos(angle)*distance;
+      y = y-sin(angle)*distance;
+      drawPentagon(x, y, side, depth-1);
+      angle += s_angle;
+    }
+  }
+}