// START OF ROTATINGMULTICURSOR
RotatingMultiCursor::RotatingMultiCursor(double xx, double yy, double rr, int s, const vector<GradientCircleCursor>& in) :
CursorContainer{in},
x{ xx },
y{ yy },
r{ rr },
speed{ s }{
initAngles();
}
void SightLightScene::onTouchMoved(cocos2d::Touch *touch,cocos2d::Event* event)
{
Point tar(0,0); //光线的端点
Point cur(0,0); //光线与线段的交点
float distance = 0; //光源与交点的距离
_touchDraw->clear();
auto pos = touch->getLocation();
//_touchDraw->drawDot(pos,5,Color4F::RED);
//计算极角,并添加两个偏移1e-4的极角
initAngles(pos);
//极角排序
std::sort(_angles.begin(), _angles.end(), [](float x,float y){
return x < y;
});
std::vector<cocos2d::Vec2> vertex;
//找最近的交点
// std::vector<Point> vertex;
for (auto angle:_angles) {
Vec2 dlt(cos(angle),sin(angle));
float closest = -1;
for (auto s:_segments) {
if (getIntersection(Line(pos,pos + dlt),s,cur,distance)) {
if (closest == -1 || closest > distance) {
closest = distance;
tar = cur;
}
}
}
if (closest != -1) {
vertex.push_back(tar);
}
}
//画三角形
//下面2个循环第3个参数可以写为vertex[(i+1) % vertex.size()],合并成1个循环
//但是显然，取余操作效率太低，分开写更好一些
int limit = vertex.size() - 1;
for (int i = 0; i < limit; i++) {
_touchDraw->drawTriangle(pos, vertex[i], vertex[i + 1], Color4F::WHITE);
}
if(limit > 0) {
_touchDraw->drawTriangle(pos, vertex[limit], vertex[0], Color4F::WHITE);
}
// 画三角形的边，Debug用
// for(auto v : vertex) {
// _touchDraw->drawSegment(pos, v, 0.5f, Color4F::RED);
// _touchDraw->drawDot(v, 3, Color4F::RED);
// }
}
void RotatingMultiCursor::chCursors(const vector<GradientCircleCursor>& cs_in){
cs = cs_in;
initAngles();
update();
}
