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                 p1 = point;
  61         else if (state == SECOND_POINT)
  62         {
  63                 p2 = point;
  64                 Vector r1(p2, p1);
  65                 radius = Vector::Magnitude(p1, p2);
  66                 startAngle = r1.Angle();
  67         }
  68         else if (state == THIRD_POINT)
  69         {
  70                 p3 = point;
  71                 Vector r2(p3, p1);
  72                 span = r2.Angle() - startAngle;
  73
  74                 if (span < 0)
  75                         span += 2.0 * PI;
  76         }
  77 }
  78
  79
  80 /*virtual*/ void DrawArcAction::MouseMoved(Vector point)
  81 {
  82         if (state == FIRST_POINT)
  83                 p1 = point;
  84         else if (state == SECOND_POINT)
  85         {
  86                 p2 = point;
  87                 Vector r1(p2, p1);
  88                 radius = Vector::Magnitude(p1, p2);
  89                 startAngle = r1.Angle();
  90         }
  91         else if (state == THIRD_POINT)
  92         {
  93                 p3 = point;
  94                 Vector r2(p3, p1);
  95                 span = r2.Angle() - startAngle;
  96
  97                 if (span < 0)
  98                         span += 2.0 * PI;
  99         }
 100 }
 101
 102
 103 /*virtual*/ void DrawArcAction::MouseReleased(void)
 104 {
 105         if (state == FIRST_POINT)
 106         {
 107                 state = SECOND_POINT;
 108         }
 109         else if (state == SECOND_POINT)
 110         {
 111                 state = THIRD_POINT;
 112         }
 113         else if (state == THIRD_POINT)
 114         {
 115                 // We create the new object here, and then pass it off to the
 116                 // DrawingView which stuffs it into the document.
 117                 arc = new Arc(p1, radius, startAngle, span);
 118                 // We don't need no stinkin' sentinels, when we have signals & slots!
 119                 emit ObjectReady(arc);
 120
 121                 state = FIRST_POINT;
 122         }
 123 }
 124
 125
 126 /*virtual*/ void DrawArcAction::KeyDown(int /*key*/)
 127 {
 128 }
 129
 130
 131 /*virtual*/ void DrawArcAction::KeyReleased(int /*key*/)
 132 {
 133 }
 134