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