--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Renderer/Application/ball_bound.cc	Mon Oct 12 09:39:35 2009 +0900
@@ -0,0 +1,128 @@
+#include <math.h>
+#include <stdlib.h>
+#include "SceneGraphRoot.h"
+#include "SGList.h"
+
+// prototype
+static void ball_move(SceneGraphPtr node, int screen_w, int screen_h);
+static void ball_collision(SceneGraphPtr node, int screen_w, int screen_h, SceneGraphPtr tree);
+static void ball_collision_idle(SceneGraphPtr, int w, int h, SceneGraphPtr tree);
+
+
+static float vy = 0.0f; // y 方向速度
+static float dt = 1.0/1.0f; // frame rate 
+
+static float e = -0.8f;  // 反発係数
+static float g = 9.8f;  // 重力加速度
+//static float v0 = 0.0f; // 初速は 0
+
+static float h0; // 初期高さ
+static float ball_radius = 100.0f;
+
+static float speed = 10.0f;
+
+static void
+ball_move_idle2(SceneGraphPtr node, int screen_w, int screen_h)
+{
+    Pad *pad = sgroot->getController();
+
+    if (pad->circle.isHold()) {
+		if (pad->left.isHold()) {
+			node->xyz[0] -= speed;
+			if(node->xyz[0] < ball_radius)
+				node->xyz[0] = ball_radius;
+		} else if (pad->right.isHold()) {
+			node->xyz[0] += speed;
+			if(node->xyz[0] > screen_w  - ball_radius)
+				node->xyz[0] = screen_w - ball_radius;
+		}
+
+		if (pad->up.isHold()) {
+			node->xyz[1] -= speed;
+		} else if (pad->down.isHold()) {
+			node->xyz[1] += speed;
+            if(node->xyz[1] > screen_h - ball_radius)
+				node->xyz[1] = screen_h - ball_radius;
+		}
+    } else {
+		node->set_move_collision(ball_move, ball_collision);
+    }
+}
+
+static int time = 0;
+
+static void
+ball_move_idle(SceneGraphPtr node, int screen_w, int screen_h)
+{
+    Pad *pad = sgroot->getController();
+
+    if (pad->circle.isPush()) {
+		node->set_move_collision(ball_move_idle2, ball_collision_idle);
+		time = 0;
+    }
+
+    time++;
+
+    if (time > 90) {
+		float w = (float)random();
+      
+		w = fmodf(w, screen_w - ball_radius*2);
+		node->xyz[0] = w + ball_radius;
+		node->xyz[1] = h0;
+		node->set_move_collision(ball_move, ball_collision);
+		time = 0;
+    }
+}
+
+static void
+ball_move(SceneGraphPtr node, int screen_w, int screen_h)
+{
+    vy += g * dt;
+    node->xyz[1] += vy * dt;
+    //    node->xyz[0] += 10.0f;
+}
+
+static void
+ball_collision_idle(SceneGraphPtr, int w, int h, SceneGraphPtr tree)
+{
+}
+
+static void
+ball_collision(SceneGraphPtr node, int screen_w, int screen_h,
+			   SceneGraphPtr tree)
+{
+    if (node->xyz[1] > screen_h - ball_radius) {
+		node->xyz[1] = screen_h - ball_radius;
+
+		vy *= e;
+		if (vy > -g && vy < 0) {
+			vy = 0.0;
+			node->set_move_collision(ball_move_idle, ball_collision_idle);
+		}
+    }
+}
+
+
+void
+ball_bound_init(TaskManager *manager, int screen_w, int screen_h)
+{
+    SceneGraphPtr ball;
+
+    // 固定した値で srandom すると、毎回同じ、random() 列が生成される
+    // random な値が欲しいなら、man random に方法が書いてあります。
+    srandom(100);
+
+    sgroot->createFromXMLfile(manager, "xml_file/Ball.xml");
+    ball = sgroot->createSceneGraph(Ball);
+    ball->set_move_collision(ball_move, ball_collision);
+
+    h0 = screen_h/2;
+    h0 = -1000;
+
+    ball->xyz[0] = screen_w/2;
+    //ball->xyz[0] = 0.0f;
+    ball->xyz[1] = h0;
+    ball->xyz[2] = 30.0f;
+
+    sgroot->setSceneData(ball);
+}