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
  19
  20 enum { FIRST_POINT, SECOND_POINT, THIRD_POINT };
  21
  22
  23 DrawArcAction::DrawArcAction(): state(FIRST_POINT), arc(NULL)
  24 {
  25 }
  26
  27
  28 DrawArcAction::~DrawArcAction()
  29 {
  30 }
  31
  32
  33 /*virtual*/ void DrawArcAction::Draw(Painter * painter)
  34 {
  35         painter->SetPen(QPen(Qt::red, 2.0, Qt::DotLine));
  36
  37         // I think stuff like crosshairs should be done in the DrawingView, tho
  38         // (and it is! :-D)
  39         if (state == FIRST_POINT)
  40         {
  41                 painter->DrawHandle(p1);
  42         }
  43         else if (state == SECOND_POINT)
  44         {
  45                 painter->DrawLine(p1, p2);
  46                 painter->DrawHandle(p2);
  47         }
  48         else if (state == THIRD_POINT)
  49         {
  50                 painter->DrawLine(p1, p2);
  51                 painter->DrawArc(p1, radius, startAngle, span);
  52                 painter->DrawHandle(p3);
  53         }
  54 }
  55
  56
  57 /*virtual*/ void DrawArcAction::MouseDown(Vector point)
  58 {
  59         if (state == FIRST_POINT)
  60                 // How to check for hitting an object here?
  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
 126
 127 /*virtual*/ void DrawArcAction::KeyDown(int /*key*/)
 128 {
 129 }
 130
 131
 132 /*virtual*/ void DrawArcAction::KeyReleased(int /*key*/)
 133 {
 134 }
 135