From ff092b42b596fe15a0e1122beb4fc5c8ae032b7c Mon Sep 17 00:00:00 2001
From: Eleni Maria Stea <estea@igalia.com>
Date: Sun, 19 Apr 2020 14:49:07 +0300
Subject: [PATCH] Added idle func animation

---
 src/main.cc     |    9 ++++++++-
 src/tentacle.cc |   11 ++++++++---
 src/tentacle.h  |    2 +-
 3 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/src/main.cc b/src/main.cc
index c5ebc84..38ec59e 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -9,6 +9,7 @@ static void cleanup();
 
 static void display();
 static void keyboard(unsigned char key, int x, int y);
+static void idle();
 
 /* XXX FIXME */
 static Tentacle tentacle;
@@ -22,6 +23,7 @@ int main(int argc, char **argv)
 	glutCreateWindow("ludu mice");
 	glutDisplayFunc(display);
 	glutKeyboardFunc(keyboard);
+	glutIdleFunc(idle);
 
 	if (!init())
 		exit(1);
@@ -56,7 +58,7 @@ static void display()
 	glMatrixMode(GL_MODELVIEW);
 	glLoadIdentity();
 
-	tentacle.draw();
+	tentacle.draw(glutGet(GLUT_ELAPSED_TIME));
 
 	glutSwapBuffers();
 }
@@ -70,3 +72,8 @@ static void keyboard(unsigned char key, int x, int y)
 		break;
 	}
 }
+
+static void idle()
+{
+	glutPostRedisplay();
+}
diff --git a/src/tentacle.cc b/src/tentacle.cc
index 7a69c29..ceb5e43 100644
--- a/src/tentacle.cc
+++ b/src/tentacle.cc
@@ -25,13 +25,16 @@ Tentacle::add_control_point(const Vec3 &point)
 }
 
 void
-Tentacle::draw()
+Tentacle::draw(long time)
 {
 	glLineWidth(2.0);
 	glBegin(GL_LINE_STRIP);
 	glColor3f(0.0, 0.0, 1.0);
 	for(size_t i=0; i<cpoints.size(); i++) {
-		glVertex3f(cpoints[i].x, cpoints[i].y, cpoints[i].z);
+		float y = cpoints[i].y;
+		float offs = gph::noise(y, time * 0.0005 * y);
+		glVertex3f(cpoints[i].x + offs, y, cpoints[i].z + offs);
+
 	}
 	glEnd();
 
@@ -41,7 +44,9 @@ Tentacle::draw()
 	glBegin(GL_POINTS);
 	glColor3f(1.0, 0.0, 0.0);
 	for(size_t i=0; i<cpoints.size(); i++) {
-		glVertex3f(cpoints[i].x, cpoints[i].y, 1.0);
+		float y = cpoints[i].y;
+		float offs = gph::noise(y, time * 0.0005 * y);
+		glVertex3f(cpoints[i].x + offs, y, cpoints[i].z + offs);
 	}
 	glEnd();
 	glEnable(GL_DEPTH_TEST);
diff --git a/src/tentacle.h b/src/tentacle.h
index cb07a35..1b83afd 100644
--- a/src/tentacle.h
+++ b/src/tentacle.h
@@ -14,7 +14,7 @@ public:
 
 	bool init();
 	void add_control_point(const Vec3 &point);
-	void draw();
+	void draw(long time);
 };
 
 #endif // TENTACLE_H_
-- 
1.7.10.4