net.mograsim.logic.model.editor/src/net/mograsim/logic/model/editor/handles/WireHandle.java

   1 package net.mograsim.logic.model.editor.handles;
   2
   3 import java.util.Optional;
   4
   5 import org.eclipse.swt.SWT;
   6 import org.eclipse.swt.widgets.Display;
   7
   8 import net.haspamelodica.swt.helper.gcs.GeneralGC;
   9 import net.haspamelodica.swt.helper.swtobjectwrappers.Point;
  10 import net.haspamelodica.swt.helper.swtobjectwrappers.Rectangle;
  11 import net.mograsim.logic.model.editor.states.EditorState;
  12 import net.mograsim.logic.model.model.wires.GUIWire;
  13 import net.mograsim.logic.model.model.wires.GUIWire.PathChangedListener;
  14
  15 public class WireHandle extends Handle implements PathChangedListener
  16 {
  17         private boolean selected = false;
  18         private final static double WIDTH = 2.0;
  19         private final static double WIDTH_SQUARED = WIDTH * WIDTH;
  20         public final GUIWire parent;
  21
  22         public WireHandle(GUIWire parent)
  23         {
  24                 this.parent = parent;
  25                 parent.addPathChangedListener(this);
  26                 updateBounds();
  27         }
  28
  29         @Override
  30         void destroy()
  31         {
  32                 super.destroy();
  33                 parent.removePathChangedListener(this);
  34         }
  35
  36         public void updateBounds()
  37         {
  38                 Rectangle r = parent.getBounds();
  39                 moveTo(r.x, r.y);
  40                 setSize(r.width, r.height);
  41         }
  42
  43         @Override
  44         public void render(GeneralGC gc)
  45         {
  46                 if(selected)
  47                 {
  48                         gc.setLineWidth(WIDTH);
  49                         gc.setForeground(Display.getDefault().getSystemColor(SWT.COLOR_YELLOW));
  50                         gc.drawPolyline(parent.getEffectivePath());
  51                 }
  52         }
  53
  54         @Override
  55         public void onSelect()
  56         {
  57                 selected = true;
  58                 callRedrawListeners();
  59         }
  60
  61         @Override
  62         public void onDeselect()
  63         {
  64                 selected = false;
  65                 callRedrawListeners();
  66         }
  67
  68         @Override
  69         public void reqDelete()
  70         {
  71                 parent.destroy();
  72         }
  73
  74         @Override
  75         public boolean contains(double x, double y)
  76         {
  77                 return click(parent, x, y).isPresent();
  78         }
  79
  80         @Override
  81         public boolean click(double x, double y, int stateMask, EditorState state)
  82         {
  83                 Optional<WireClickData> op = click(parent, x, y);
  84                 if(op.isEmpty())
  85                         return false;
  86                 WireClickData data = op.get();
  87                 return state.clickedHandle(new WireHandleClickInfo(this, data.segment, data.pos, stateMask));
  88         }
  89
  90         public static class WireHandleClickInfo extends HandleClickInfo
  91         {
  92                 public final int segment;
  93                 public final Point posOnWire;
  94                 WireHandleClickInfo(WireHandle clicked, int segment, Point posOnWire, int stateMask)
  95                 {
  96                         super(clicked, stateMask);
  97                         this.segment = segment;
  98                         this.posOnWire = posOnWire;
  99                 }
 100
 101         }
 102
 103         private static Optional<WireClickData> click(GUIWire w, double x, double y)
 104         {
 105                 Rectangle modifiedBounds = w.getBounds();
 106                 modifiedBounds.x -= WIDTH;
 107                 modifiedBounds.y -= WIDTH;
 108                 modifiedBounds.width += WIDTH * 2;
 109                 modifiedBounds.height += WIDTH * 2;
 110                 if (modifiedBounds.contains(x, y))
 111                 {
 112                         double[] effectivePath = w.getEffectivePath();
 113                         for (int i = 3; i < effectivePath.length; i += 2)
 114                         {
 115                                 double a1 = effectivePath[i - 3], a2 = effectivePath[i - 2], b1 = effectivePath[i - 1],
 116                                                 b2 = effectivePath[i], r1 = b2 - a2, r2 = a1 - b1;
 117
 118                                 double f = ((x - a1) * r2 + (a2 - y) * r1) / (-r2 * r2 - r1 * r1);
 119                                 if (f >= 0 && f <= 1)
 120                                 {
 121                                         double e1 = a1 + f * (b1 - a1), e2 = a2 + f * (b2 - a2);
 122                                         r1 = e1 - x;
 123                                         r2 = e2 - y;
 124                                         if (r1 * r1 + r2 * r2 <= WIDTH_SQUARED)
 125                                                 return Optional.of(new WireClickData(new Point(e1, e2), (i / 2) - 1));
 126                                 }
 127                         }
 128                 }
 129                 return Optional.empty();
 130         }
 131
 132         private final static class WireClickData
 133         {
 134                 WireClickData(Point pos, int segment)
 135                 {
 136                         this.pos = pos;
 137                         this.segment = segment;
 138                 }
 139
 140                 /**
 141                  * Position on the wire that is closest to the click
 142                  */
 143                 public final Point pos;
 144                 /**
 145                  * Segment of the wire that the {@link Point} pos is on
 146                  */
 147                 public final int segment;
 148         }
 149
 150         @Override
 151         public HandleType getType()
 152         {
 153                 return HandleType.WIRE;
 154         }
 155
 156         @Override
 157         public void pathChanged(GUIWire wire, int diff)
 158         {
 159                 updateBounds();
 160         }
 161 }