1 /****************************************************************************

     2 **

     3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

     4 ** All rights reserved.

     5 ** Contact: Nokia Corporation (qt-info@nokia.com)

     6 **

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

     8 **

     9 ** $QT_BEGIN_LICENSE:LGPL$

    10 ** No Commercial Usage

    11 ** This file contains pre-release code and may not be distributed.

    12 ** You may use this file in accordance with the terms and conditions

    13 ** contained in the Technology Preview License Agreement accompanying

    14 ** this package.

    15 **

    16 ** GNU Lesser General Public License Usage

    17 ** Alternatively, this file may be used under the terms of the GNU Lesser

    18 ** General Public License version 2.1 as published by the Free Software

    19 ** Foundation and appearing in the file LICENSE.LGPL included in the

    20 ** packaging of this file.  Please review the following information to

    21 ** ensure the GNU Lesser General Public License version 2.1 requirements

    22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.

    23 **

    24 ** In addition, as a special exception, Nokia gives you certain additional

    25 ** rights.  These rights are described in the Nokia Qt LGPL Exception

    26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.

    27 **

    28 ** If you have questions regarding the use of this file, please contact

    29 ** Nokia at qt-info@nokia.com.

    30 **

    31 **

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    36 **

    37 **

    38 ** $QT_END_LICENSE$

    39 **

    40 ****************************************************************************/

    41 

    42 #include <cmath>

    43 #include "guide.h"

    44 #include "colors.h"

    45 

    46 Guide::Guide(Guide *follows)

    47 {

    48     this->scaleX = 1.0;

    49     this->scaleY = 1.0;

    50 

    51     if (follows){

    52         while (follows->nextGuide != follows->firstGuide) // append to end

    53             follows = follows->nextGuide;

    54 

    55         follows->nextGuide = this;

    56         this->prevGuide = follows;

    57         this->firstGuide = follows->firstGuide;

    58         this->nextGuide = follows->firstGuide;

    59         this->startLength = int(follows->startLength + follows->length()) + 1;

    60     }

    61     else{

    62         this->prevGuide = this;

    63         this->firstGuide = this;

    64         this->nextGuide = this;

    65         this->startLength = 0;

    66     }

    67 }

    68 

    69 void Guide::setScale(float scaleX, float scaleY, bool all)

    70 {

    71     this->scaleX = scaleX;

    72     this->scaleY = scaleY;

    73 

    74     if (all){

    75         Guide *next = this->nextGuide;

    76         while(next != this){

    77             next->scaleX = scaleX;

    78             next->scaleY = scaleY;

    79             next = next->nextGuide;

    80         }

    81     }

    82 }

    83 

    84 void Guide::setFence(const QRectF &fence, bool all)

    85 {

    86     this->fence = fence;

    87 

    88     if (all){

    89         Guide *next = this->nextGuide;

    90         while(next != this){

    91             next->fence = fence;

    92             next = next->nextGuide;

    93         }

    94     }

    95 }

    96 

    97 Guide::~Guide()

    98 {

    99     if (this != this->nextGuide && this->nextGuide != this->firstGuide)

   100         delete this->nextGuide;

   101 }

   102 

   103 float Guide::lengthAll()

   104 {

   105     float len = length();

   106     Guide *next = this->nextGuide;

   107     while(next != this){

   108         len += next->length();

   109         next = next->nextGuide;

   110     }

   111     return len;

   112 }

   113 

   114 void Guide::move(DemoItem *item, QPointF &dest, float moveSpeed)

   115 {

   116     QLineF walkLine(item->getGuidedPos(), dest);

   117     if (moveSpeed >= 0 && walkLine.length() > moveSpeed){

   118         // The item is too far away from it's destination point.

   119         // So we choose to move it towards it instead.

   120         float dx = walkLine.dx();

   121         float dy = walkLine.dy();

   122 

   123         if (qAbs(dx) > qAbs(dy)){

   124             // walk along x-axis

   125             if (dx != 0){

   126                 float d = moveSpeed * dy / qAbs(dx);

   127                 float s = dx > 0 ? moveSpeed : -moveSpeed;

   128                 dest.setX(item->getGuidedPos().x() + s);

   129                 dest.setY(item->getGuidedPos().y() + d);

   130             }

   131         }

   132         else{

   133             // walk along y-axis

   134             if (dy != 0){

   135                 float d = moveSpeed * dx / qAbs(dy);

   136                 float s = dy > 0 ? moveSpeed : -moveSpeed;

   137                 dest.setX(item->getGuidedPos().x() + d);

   138                 dest.setY(item->getGuidedPos().y() + s);

   139             }

   140         }

   141     }

   142 

   143     item->setGuidedPos(dest);

   144 }