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FigureController.cpp
151 lines (132 loc) · 3.77 KB
/
FigureController.cpp
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#include "FigureController.h"
FigureController::FigureController()
{
painter = NULL;
}
double FigureController::getRotaryAngle(Point center, Point a, Point b)
{
double ab = a.distanceToPoint(b.getQPoint());
double ac = a.distanceToPoint(center.getQPoint());
double bc = b.distanceToPoint(center.getQPoint());
qreal cosC = (bc*bc+ac*ac-ab*ab)/(2*bc*ac);
double theta = qAcos(cosC);
qDebug()<<"Angle is"<<theta<<endl;
return theta; //弧度制
}
bool FigureController::clockWise(Point center, Point a, Point b)
{
//k=0
if(center.getY()==a.getY()){
if(a.getX()>center.getX())// -------->型向量
{
if(b.getY() > a.getY()){
return true;
}else{
return false;
}
}
else// <--------型向量
{
if(b.getY() < a.getY()){
return true;
}else{
return false;
}
}
}
//k不存在
if(center.getX()==a.getX()){
if(a.getY()<center.getY())//竖直向上
{
if(b.getX()>a.getX()){
return true;
}else{
return false;
}
}
else //竖直向下
{
if(b.getX()<a.getX()){
return true;
}else{
return false;
}
}
}
//斜率存在切不为零
double x0 = 0;
double y0 = 0;
double x1 = a.getQPoint().x() - center.getQPoint().x(); //把中点当原点
double y1 = a.getQPoint().y() - center.getQPoint().y(); //把中点当原点
double k = (y1-y0)/(x1-x0);
double x2 = b.getX() - center.getX(); //把中点当原点(要用坐标直接比较还得标准化)
double y2 = b.getY() - center.getY(); //把中点当原点
qDebug()<<"Rotate:: start("<<x1<<","<<y1<<endl;
qDebug()<<"Rotate:: end("<<x2<<","<<y2<<endl;
// Point stdPoint(x2,y2);
// double stdR = a.distanceToPoint(center.getQPoint());
// double stdPara = stdR / stdPoint.distanceToPoint(center.getQPoint());
// x2 *= stdPara;
// y2 *= stdPara;
//对斜率和向量方向进行判断。。有点麻烦
if(a.getX()>center.getX())//方向向右
{
if(y2>(k*x2)){ //y > kx
return true;
}else{
return false;
}
}
else //方向朝左
{
if(y2<(k*x2)){ //y > kx
return true;
}else{
return false;
}
}
}
double FigureController::getLength(QPoint &start, QPoint &end)
{
int x0 = start.x();
int y0 = start.y();
int x1 = end.x();
int y1 = end.y();
return sqrt((x0-x1)*(x0-x1)+(y0-y1)*(y0-y1));
}
void FigureController::drawOutlineToDebug(QPainter *painter, QPoint &start, QPoint &end)
{
QPen savePen = painter->pen();
QPen debugPen;
debugPen.setStyle(Qt::DashLine);
debugPen.setWidth(1);
debugPen.setColor(Qt::black);
painter->setPen(debugPen);
int x0 = start.x();
int y0 = start.y();
int x = end.x()-x0;
int y = end.y()-y0;
QPoint temPt1(x0+x,y0+y);
QPoint temPt2(x0+x,y0-y);
QPoint temPt3(x0-x,y0+y);
QPoint temPt4(x0-x,y0-y);
painter->drawLine(temPt1,temPt2);
painter->drawLine(temPt1,temPt3);
painter->drawLine(temPt4,temPt2);
painter->drawLine(temPt3,temPt4);
painter->setPen(savePen);
}
void FigureController::drawOutlineToDebug(QPainter *painter, QPoint a, QPoint b, QPoint c, QPoint d)
{
QPen savePen = painter->pen();
QPen debugPen;
debugPen.setStyle(Qt::DashLine);
debugPen.setWidth(1);
debugPen.setColor(Qt::black);
painter->setPen(debugPen);
painter->drawLine(a,b);
painter->drawLine(b,c);
painter->drawLine(c,d);
painter->drawLine(d,a);
painter->setPen(savePen);
}