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41
42 #include "guidecircle.h"
43
44 static float PI2 = 2*3.1415f;
45
GuideCircle(const QRectF & rect,float startAngle,float span,DIRECTION dir,Guide * follows)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
length()65 float GuideCircle::length()
66 {
67 return qAbs(this->radiusX * spanRad);
68 }
69
startPos()70 QPointF GuideCircle::startPos()
71 {
72 return QPointF((posX + radiusX + radiusX * cos(startAngleRad)) * scaleX,
73 (posY + radiusY + radiusY * sin(startAngleRad)) * scaleY);
74 }
75
endPos()76 QPointF GuideCircle::endPos()
77 {
78 return QPointF((posX + radiusX + radiusX * cos(endAngleRad)) * scaleX,
79 (posY + radiusY + radiusY * sin(endAngleRad)) * scaleY);
80 }
81
guide(DemoItem * item,float moveSpeed)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 }
89