[Week8-1]实现摄像机视角移动的鼠标和滚轮事件

toulzx · Nov 13, 2021 · 1f0d24d · 1f0d24d
1 parent 8c28056
commit 1f0d24d
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Showing 2 changed files with 67 additions and 5 deletions.
diff --git a/Source/HelloCG/Camera.h b/Source/HelloCG/Camera.h
@@ -16,7 +16,9 @@ const GLfloat DEFAULT_PITCH = 0.0f;
 // 视域（控制缩放）
 const GLfloat DEFAULT_ZOOM = 45.0f;
 // 相机移动速度
-const GLfloat DEFAULT_SPEED = 6.0f;		
+const GLfloat DEFAULT_SPEED = 6.0f;	
+// 鼠标灵敏程度
+const GLfloat DEFAULT_SENSITIVITY = 0.1f;
 
 const glm::vec3 DEFAULT_POSITION = glm::vec3(0.0f, 0.0f, 0.0f);
 
@@ -48,7 +50,8 @@ class Camera
 		pitch(DEFAULT_PITCH),
 		movementSpeed(DEFAULT_SPEED),
 		cameraFront(DEFAULT_CAMERA_FRONT), 
-		zoom(DEFAULT_ZOOM)
+		zoom(DEFAULT_ZOOM), 
+		mouseSensitivity(DEFAULT_SENSITIVITY)
 	{
 		this->updateCameraVectors();
 	}
@@ -64,6 +67,7 @@ class Camera
 		this->movementSpeed = DEFAULT_SPEED;
 		this->cameraFront = DEFAULT_CAMERA_FRONT;
 		this->zoom = DEFAULT_ZOOM;
+		this->mouseSensitivity = DEFAULT_SENSITIVITY;
 		this->updateCameraVectors();
 	}
 	*/
@@ -73,7 +77,7 @@ class Camera
 	Camera(glm::vec3 position = glm::vec3(0.0f, 0.0f, 0.0f),
 		glm::vec3 up = glm::vec3(0.0f, 1.0f, 0.0f),
 		GLfloat yaw = DEFAULT_YAW,
-		GLfloat pitch = DEFAULT_PITCH) :cameraFront(glm::vec3(0.0f, 0.0f, -1.0f)), zoom(DEFAULT_ZOOM), movementSpeed(DEFAULT_SPEED)
+		GLfloat pitch = DEFAULT_PITCH) :cameraFront(glm::vec3(0.0f, 0.0f, -1.0f)), zoom(DEFAULT_ZOOM), movementSpeed(DEFAULT_SPEED), mouseSensitivity(DEFAULT_SENSITIVITY)
 	{
 		this->position = position;
 		this->worldUp = up;
@@ -116,13 +120,36 @@ class Camera
 		}
 	}
 
+	void ProcessMouseMovement(GLfloat xOffset, GLfloat yOffset)
+	{
+		xOffset *= this->mouseSensitivity;
+		yOffset *= this->mouseSensitivity;
+
+		this->yaw += xOffset;
+		this->pitch += yOffset;
+
+		this->updateCameraVectors();
+
+	}
+
+	void ProcessScroll(GLfloat xOffset, GLfloat yOffset)
+	{
+		if (this->zoom >= 1.0f && this->zoom <= 45.0f)
+			this->zoom -= yOffset;
+		if (this->zoom <= 1.0f)
+			this->zoom = 1.0f;
+		if (this->zoom >= DEFAULT_ZOOM)
+			this->zoom = 45.0f;
+	}
+
 
 private:
 	GLfloat yaw;
-	GLfloat pitch;
+	GLfloat pitch;	
 	GLfloat zoom;
 
 	GLfloat movementSpeed;
+	GLfloat mouseSensitivity;
 
 	glm::vec3 cameraPosition;
 

diff --git a/Source/HelloCG/main.cpp b/Source/HelloCG/main.cpp
@@ -22,12 +22,23 @@ bool keys[1024];
 void KeyCallback(GLFWwindow* window, int key, int scancode, int action, int mode);
 // 处理相机前后左右移动
 void DoMovement();
+// 实现滚轮触发操作
+void ScrollCallback(GLFWwindow* window, double xOffset, double yOffset);
+// 实现鼠标移动触发操作
+void MouseCallback(GLFWwindow* window, double xPos, double yPos);
 
 // 用摄像机坐标对相机视角的实例化
 Camera camera(glm::vec3(0.0f, 0.0f, 2.0f));
+
 GLfloat deltaTime = 0.0f;
 GLfloat lastTime = 0.0f;
 
+// 判断是否是第一次获取鼠标位置
+bool firstMouse = true;
+
+GLfloat lastX = WIDTH / 2.0f;
+GLfloat lastY = HEIGHT / 2.0f;
+
 
 int main()
 {
@@ -56,8 +67,10 @@ int main()
 	// 设置焦点为当前窗口
 	glfwMakeContextCurrent(window);
 
-	// 在 GLFW 中注册键盘响应
+	// 在 GLFW 中注册响应
 	glfwSetKeyCallback(window, KeyCallback);
+	glfwSetCursorPosCallback(window, MouseCallback);
+	glfwSetScrollCallback(window, ScrollCallback);
 
 
 	glewExperimental = GL_TRUE;
@@ -249,3 +262,25 @@ void DoMovement()
 	}
 
 }
+
+void ScrollCallback(GLFWwindow* window, double xOffset, double yOffset)
+{
+	camera.ProcessScroll(xOffset, yOffset);
+}
+
+void MouseCallback(GLFWwindow* window, double xPos, double yPos)
+{
+	if (firstMouse)
+	{
+		lastX = xPos;
+		lastY = yPos;
+		firstMouse = false;
+	}
+
+	GLfloat xOffset = xPos - lastX;
+	GLfloat yOffset = lastY - yPos;
+
+	lastX = xPos;
+	lastY = yPos;
+	camera.ProcessMouseMovement(xOffset, yOffset);
+}