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Ellipse.cpp
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Ellipse.cpp
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#include "Ellipse.h"
Ellipse::Ellipse()
{
this->start = NULL;
this->end = NULL;
this->type = ELLIPSE;
}
Ellipse::Ellipse(QPoint *start, QPoint *end)
{
this->start = start;
this->end = end;
this->type = ELLIPSE;
}
void Ellipse::setStartPoint(Point p)
{
this->startPoint = p; //圆心
this->centerPoint = p; //圆心
//2018/11/26对旋转点的定义采取多边形的旋转点定义法
setRotatePoint();
}
void Ellipse::setEndPoint(Point p)
{
this->endPoint = p;
this->centerPoint = this->startPoint;
setRotatePoint();
}
void Ellipse::setRotatePoint()
{
double cX = this->centerPoint.getX();
double cY = this->centerPoint.getY();
qDebug()<<"中点坐标为: "<<"("<<(int)cX<<","<<(int)cY<<")"<<endl;
double halfR = startPoint.distanceToPoint(endPoint.getQPoint())/3;
double offSetX = cX + halfR*qSin(rotateAngle);
double offSetY = cY - halfR*qCos(rotateAngle);
rotatePoint.setPoint(offSetX,offSetY); //旋转点
}
void Ellipse::getRectangle()
{
int rx0 = this->centerPoint.getX(); //基准,圆心
int ry0 = this->centerPoint.getY();
//-------------------------------------------------------------------------
int x = this->endPoint.getX(); //右下
int y = this->endPoint.getY();
int rx = (x - rx0)*cos(-rotateAngle) + (y - ry0)*sin(-rotateAngle) + rx0 + 0.5;
int ry = -(x - rx0)*sin(-rotateAngle) + (y - ry0)*cos(-rotateAngle) + ry0 + 0.5;
//-------------------------------------------------------------------------
int x2 = x; //右上
int y2 = 2*ry0-y;
int rx2 = (x - rx0)*cos(-rotateAngle) + (y2 - ry0)*sin(-rotateAngle) + rx0 + 0.5;
int ry2 =-(x - rx0)*sin(-rotateAngle) + (y2 - ry0)*cos(-rotateAngle) + ry0 + 0.5;
//-------------------------------------------------------------------------
LeftUp.setPoint(2*rx0-rx,2*ry0-ry); //左上角(minX,minY)
LeftDown.setPoint(2*rx0-rx2,2*ry0-ry2); //左下角(minX,maxY)
RightUp.setPoint(rx2,ry2); //右上角(maxX,minY)
RightDown.setPoint(rx,ry);//右下角(maxX,maxY)
}