Shamusworld >> Repos - architektonas/blob - src/drawarcaction.cpp

   1 // drawarcaction.cpp: Draw arc object
   2 //
   3 // Part of the Architektonas Project
   4 // (C) 2011 Underground Software
   5 // See the README and GPLv3 files for licensing and warranty information
   6 //
   7 // JLH = James Hammons <jlhamm@acm.org>
   8 //
   9 // WHO  WHEN        WHAT
  10 // ---  ----------  ------------------------------------------------------------
  11 // JLH  08/13/2013  Created this file
  12 //
  13
  14 #include "drawarcaction.h"
  15 #include "arc.h"
  16 #include "mathconstants.h"
  17 #include "painter.h"
  18 //#include "vector.h"
  19
  20
  21 enum { FIRST_POINT, SECOND_POINT, THIRD_POINT };
  22
  23
  24 DrawArcAction::DrawArcAction(): state(FIRST_POINT), arc(NULL)
  25 {
  26 }
  27
  28
  29 DrawArcAction::~DrawArcAction()
  30 {
  31 }
  32
  33
  34 /*virtual*/ void DrawArcAction::Draw(Painter * painter)
  35 {
  36         painter->SetPen(QPen(Qt::red, 2.0, Qt::DotLine));
  37
  38         // I think stuff like crosshairs should be done in the DrawingView, tho
  39         // (and it is! :-D)
  40         if (state == FIRST_POINT)
  41         {
  42                 painter->DrawHandle(p1);
  43         }
  44         else if (state == SECOND_POINT)
  45         {
  46                 painter->DrawLine(p1, p2);
  47                 painter->DrawHandle(p2);
  48         }
  49         else if (state == THIRD_POINT)
  50         {
  51                 painter->DrawLine(p1, p2);
  52                 painter->DrawArc(p1, radius, startAngle, span);
  53                 painter->DrawHandle(p3);
  54         }
  55 }
  56
  57
  58 /*virtual*/ void DrawArcAction::MouseDown(Vector point)
  59 {
  60         if (state == FIRST_POINT)
  61                 p1 = point;
  62         else if (state == SECOND_POINT)
  63         {
  64                 p2 = point;
  65                 Vector r1(p2, p1);
  66                 radius = Vector::Magnitude(p1, p2);
  67                 startAngle = r1.Angle();
  68         }
  69         else if (state == THIRD_POINT)
  70         {
  71                 p3 = point;
  72                 Vector r2(p3, p1);
  73                 span = r2.Angle() - startAngle;
  74
  75                 if (span < 0)
  76                         span += 2.0 * PI;
  77         }
  78 }
  79
  80
  81 /*virtual*/ void DrawArcAction::MouseMoved(Vector point)
  82 {
  83         if (state == FIRST_POINT)
  84                 p1 = point;
  85         else if (state == SECOND_POINT)
  86         {
  87                 p2 = point;
  88                 Vector r1(p2, p1);
  89                 radius = Vector::Magnitude(p1, p2);
  90                 startAngle = r1.Angle();
  91         }
  92         else if (state == THIRD_POINT)
  93         {
  94                 p3 = point;
  95                 Vector r2(p3, p1);
  96                 span = r2.Angle() - startAngle;
  97
  98                 if (span < 0)
  99                         span += 2.0 * PI;
 100         }
 101 }
 102
 103
 104 /*virtual*/ void DrawArcAction::MouseReleased(void)
 105 {
 106         if (state == FIRST_POINT)
 107         {
 108                 state = SECOND_POINT;
 109         }
 110         else if (state == SECOND_POINT)
 111         {
 112                 state = THIRD_POINT;
 113         }
 114         else if (state == THIRD_POINT)
 115         {
 116                 // We create the new object here, and then pass it off to the
 117                 // DrawingView which stuffs it into the document.
 118                 arc = new Arc(p1, radius, startAngle, span);
 119                 // We don't need no stinkin' sentinels, when we have signals & slots!
 120                 emit ObjectReady(arc);
 121
 122                 state = FIRST_POINT;
 123         }
 124 }
 125