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#include "guideline.h"

#include <cmath>

GuideLine::GuideLine(const QLineF &line, Guide *follows) : Guide(follows)

{

    this->line = line;

}

GuideLine::GuideLine(const QPointF &end, Guide *follows) : Guide(follows)

{

    if (follows)

        this->line = QLineF(prevGuide->endPos(), end);

    else

        this->line = QLineF(QPointF(0, 0), end);

}

float GuideLine::length()

{

    return line.length();

}

QPointF GuideLine::startPos()

{

    return QPointF(this->line.p1().x() * scaleX, this->line.p1().y() * scaleY);

}

QPointF GuideLine::endPos()

{

    return QPointF(this->line.p2().x() * scaleX, this->line.p2().y() * scaleY);

}

void GuideLine::guide(DemoItem *item, float moveSpeed)

{

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

    float endX = (this->line.p1().x() + (frame * this->line.dx() / this->length())) * scaleX;

    float endY = (this->line.p1().y() + (frame * this->line.dy() / this->length())) * scaleY;

    QPointF pos(endX, endY);

    this->move(item, pos, moveSpeed);

}