File indexing completed on 2024-04-28 07:33:19

 /*
     SPDX-FileCopyrightText: 2003-2008 Cies Breijs <cies AT kde DOT nl>
 
     SPDX-License-Identifier: GPL-2.0-or-later
 */
 
 #include "sprite.h"
 
 #include <math.h>
 
 #include <QSvgRenderer>
 
 
 const int SPRITE_SIZE = 30;
 
 Sprite::Sprite()
     : QGraphicsSvgItem(QStringLiteral(":turtle.svg"))
 {
     m_angle = 0;
     m_speed = 0;
 
     setAngle(0);
 }
 
 void Sprite::setSpriteSize(int size)
 {
     int w = renderer()->defaultSize().width();
     int h = renderer()->defaultSize().height();
     
     if (size <= 0 || w <= 0 || h <= 0) return;
     
     qreal s = (static_cast<qreal>(size)) / ((w > h) ? w : h);
     
     setTransform(QTransform::fromScale(s, s), true);
 }
 
 void Sprite::setAngle(double degrees)
 {
     resetTransform();
     setSpriteSize(SPRITE_SIZE);
     
     // Default rotation is done with the top-left corner of the SVG as the rotation point,
     // but we want to the rotation to be around the SVG's center...
     // This is why this "translation" is needed before the actual rotation.
     QTransform transform = QTransform::fromTranslate(
         renderer()->defaultSize().width()  * cos((degrees-135) * M_PI/180) * sqrt(static_cast<double>(2.0))/2,
         renderer()->defaultSize().height() * sin((degrees-135) * M_PI/180) * sqrt(static_cast<double>(2.0))/2
     );
     transform.rotate(degrees);
     setTransform(transform, true);
     m_angle = degrees;
 
     //TODO: Check if the update can be done more efficiently
     update();
 }
 
 #include "moc_sprite.cpp"