LeapMotion SDK开发，常用功能总结

设置设备后台获取数据：

controller.setPolicyFlags(Leap::Controller::POLICY_BACKGROUND_FRAMES);

onDeviceChange：

获取设备列表： controller.devices();

获取设备名称：devices[i].toString();

判断设备是否传输： devices[i].isStreaming();

onConnect：

启用手势功能：

controller.enableGesture(Gesture::TYPE_CIRCLE);

controller.enableGesture(Gesture::TYPE_KEY_TAP);

controller.enableGesture(Gesture::TYPE_SCREEN_TAP);

controller.enableGesture(Gesture::TYPE_SWIPE);

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hand:

判断左右手： hand.isLeft();

手掌位置 hand.palmPosition();

法向量 Vector normal = hand.palmNormal();

方向向量 Vector direction = hand.direction();

与垂直轴Y的角度： normal.roll() * RAD_TO_DEG

与水平面-Z的夹角： direction.yaw() * RAD_TO_DEG

arm：

手臂的方向：arm.direction();

腕关节的位置： arm.wristPosition();

手肘的位置： arm.elbowPosition();

Finger:

指头的类型(名称)： finger.type();

指头的ID： finger.id();

指头的长度： finger.length();

指头的宽度： finger.width();

Bone:

骨头的类型：Bone::Type

骨头的开始位置点：bone.prevJoint();

骨头的结束位置点：bone.nextJoint();

骨头的方向： bone.direction();

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Tool：

工具ID： frame.id();

工具的位置：tool.tipPosition();

工具的方向： tool.direction();

Gesture:

手势类型：gesture.type();

switch (gesture.type()) {

case Gesture::TYPE_CIRCLE:

{

CircleGesture circle = gesture;

std::string clockwiseness;

if (circle.pointable().direction().angleTo(circle.normal()) <= PI/2) {

clockwiseness = "clockwise";

} else {

clockwiseness = "counterclockwise";

}

// Calculate angle swept since last frame

float sweptAngle = 0;

if (circle.state() != Gesture::STATE_START) {

CircleGesture previousUpdate = CircleGesture(controller.frame(1).gesture(circle.id()));

sweptAngle = (circle.progress() - previousUpdate.progress()) * 2 * PI;

}

std::cout << std::string(2, ' ')

<< "Circle id: " << gesture.id()

<< ", state: " << stateNames[gesture.state()]

<< ", progress: " << circle.progress()

<< ", radius: " << circle.radius()

<< ", angle " << sweptAngle * RAD_TO_DEG

<< ", " << clockwiseness << std::endl;

break;

}

case Gesture::TYPE_SWIPE:

{

SwipeGesture swipe = gesture;

std::cout << std::string(2, ' ')

<< "Swipe id: " << gesture.id()

<< ", state: " << stateNames[gesture.state()]

<< ", direction: " << swipe.direction()

<< ", speed: " << swipe.speed() << std::endl;

break;

}

case Gesture::TYPE_KEY_TAP:

{

KeyTapGesture tap = gesture;

std::cout << std::string(2, ' ')

<< "Key Tap id: " << gesture.id()

<< ", state: " << stateNames[gesture.state()]

<< ", position: " << tap.position()

<< ", direction: " << tap.direction()<< std::endl;

break;

}

case Gesture::TYPE_SCREEN_TAP:

{

ScreenTapGesture screentap = gesture;

std::cout << std::string(2, ' ')

<< "Screen Tap id: " << gesture.id()

<< ", state: " << stateNames[gesture.state()]

<< ", position: " << screentap.position()

<< ", direction: " << screentap.direction()<< std::endl;

break;

}

default:

std::cout << std::string(2, ' ') << "Unknown gesture type." << std::endl;

break;

}