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     7 ** This file is part of the demonstration applications of the Qt Toolkit.

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    41 

    42 #include "guidecircle.h"

    43 

    44 static float PI2 = 2*3.1415f;

    45 

    46 GuideCircle::GuideCircle(const QRectF &rect, float startAngle, float span, DIRECTION dir, Guide *follows) : Guide(follows)

    47 {

    48     this->radiusX = rect.width() / 2.0;

    49     this->radiusY = rect.height() / 2.0;

    50     this->posX = rect.topLeft().x();

    51     this->posY = rect.topLeft().y();

    52     this->spanRad = span * PI2 / -360.0;

    53     if (dir == CCW){

    54         this->startAngleRad = startAngle * PI2 / -360.0;

    55         this->endAngleRad = startAngleRad + spanRad;

    56         this->stepAngleRad = this->spanRad / this->length();

    57     }

    58     else{

    59         this->startAngleRad = spanRad + (startAngle * PI2 / -360.0);

    60         this->endAngleRad = startAngle * PI2 / -360.0;

    61         this->stepAngleRad = -this->spanRad / this->length();

    62     }

    63 }

    64 

    65 float GuideCircle::length()

    66 {

    67     return qAbs(this->radiusX * spanRad);

    68 }

    69 

    70 QPointF GuideCircle::startPos()

    71 {

    72     return QPointF((posX + radiusX + radiusX * cos(startAngleRad)) * scaleX,

    73                    (posY + radiusY + radiusY * sin(startAngleRad)) * scaleY);

    74 }

    75 

    76 QPointF GuideCircle::endPos()

    77 {

    78     return QPointF((posX + radiusX + radiusX * cos(endAngleRad)) * scaleX,

    79                    (posY + radiusY + radiusY * sin(endAngleRad)) * scaleY);

    80 }

    81 

    82 void GuideCircle::guide(DemoItem *item, float moveSpeed)

    83 {

    84     float frame = item->guideFrame - this->startLength;

    85     QPointF end((posX + radiusX + radiusX * cos(startAngleRad + (frame * stepAngleRad))) * scaleX,

    86                 (posY + radiusY + radiusY * sin(startAngleRad + (frame * stepAngleRad))) * scaleY);

    87     this->move(item, end, moveSpeed);

    88 }