Boids/C: Difference between revisions

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@@ Line 84: / Line 84: @@
 typedef struct {
 	vec position, heading, newheading;
+	flt speed;
 } boid_t;
@@ Line 284: / Line 285: @@
 	int i;
 	for (i = 0; i < N; i++)
-		vmuladd_to(&boids[i].position, &boids[i].heading, msec * MOVE_SPEED);
+		vmuladd_to(&boids[i].position, &boids[i].heading, msec * boids[i].speed);
 	vec average = {{0,0,0}};
@@ Line 365: / Line 366: @@
 	glTranslatef(b->position.x[0], b->position.x[1], b->position.x[2]);
-	flt yaw = atan2(b->heading.x[1], b->heading.x[0]) / PI * 180 - 90;
+	float *x = b->heading.x;
+	flt yaw = atan2(x[1], x[0]) / PI * 180 - 90;
 	glRotatef(yaw, 0, 0, 1);
+	flt rxy = sqrt(x[0] * x[0] + x[1] * x[1]);
+	flt pitch = atan2(x[2], rxy) / PI * 180;
+	glRotatef(pitch, 1, 0, 0);
 	glBegin(GL_TRIANGLES);
@@ Line 533: / Line 540: @@
 		flt z = (((flt)rand() / RAND_MAX) + .5) * IDEAL_HEIGHT + ground_height(x, y);
 		boids[i].position = (vec){{x, y, z}};
+		boids[i].speed = (0.98 + 0.04 * rand() / RAND_MAX) * MOVE_SPEED;
 	}