| 1 | package de.uka.ipd.sdq.pcm.gmf.composite; |
| 2 | |
| 3 | import org.eclipse.draw2d.AbstractConnectionAnchor; |
| 4 | import org.eclipse.draw2d.ConnectionAnchor; |
| 5 | import org.eclipse.draw2d.Graphics; |
| 6 | import org.eclipse.draw2d.IFigure; |
| 7 | import org.eclipse.draw2d.PositionConstants; |
| 8 | import org.eclipse.draw2d.geometry.Point; |
| 9 | import org.eclipse.draw2d.geometry.Rectangle; |
| 10 | |
| 11 | /** |
| 12 | * Represents the UML style --( ) border figure |
| 13 | * which rotates depending on the side the figure |
| 14 | * is located in relation to it's parent. |
| 15 | * |
| 16 | * @author Philipp Meier |
| 17 | */ |
| 18 | public class BallFigure extends AbstractBorderFigure { |
| 19 | |
| 20 | /** |
| 21 | * @param size width and hight of the figure in logical units (LP) |
| 22 | * @param posType position type of the figure |
| 23 | */ |
| 24 | public BallFigure(int logicalSize, POSITION_TYPE posType) { |
| 25 | super(logicalSize, posType); |
| 26 | } |
| 27 | |
| 28 | protected void paintFigure(Graphics graphics) { |
| 29 | super.paintFigure(graphics); |
| 30 | |
| 31 | if (getBorderItemLocator() == null) { |
| 32 | System.out.println("border item locator null in BallFigure.paintFigure"); |
| 33 | } |
| 34 | |
| 35 | // determine the side the border item is located relative to it's parent |
| 36 | int side = (getBorderItemLocator() == null ? PositionConstants.WEST : getBorderItemLocator().getCurrentSideOfParent()); |
| 37 | |
| 38 | Rectangle rect = new Rectangle(); |
| 39 | graphics.getClip(rect); |
| 40 | |
| 41 | // shrink rect so the last pixel of the circle is not clipped by the bounding box |
| 42 | rect.shrink(1, 1); |
| 43 | |
| 44 | // depending on the side draw a line from the center of the side of the bounding box touching the parent |
| 45 | // to the center of the bounding box and then draw a circle in the remaining half of the bounding box |
| 46 | switch(side){ |
| 47 | case PositionConstants.EAST: |
| 48 | graphics.drawLine(rect.getLeft().x,rect.getCenter().y,rect.getCenter().x,rect.getCenter().y); |
| 49 | graphics.drawArc(rect.getCenter().x, rect.getTop().y+rect.height/4, rect.height/2, rect.height/2, 0, 360); |
| 50 | break; |
| 51 | case PositionConstants.WEST: |
| 52 | graphics.drawLine(rect.getRight().x,rect.getCenter().y,rect.getCenter().x,rect.getCenter().y); |
| 53 | graphics.drawArc(rect.getLeft().x, rect.getTop().y+rect.height/4, rect.height/2, rect.height/2, 0, 360); |
| 54 | break; |
| 55 | case PositionConstants.NORTH: |
| 56 | graphics.drawLine(rect.getCenter().x,rect.getBottom().y,rect.getCenter().x,rect.getCenter().y); |
| 57 | graphics.drawArc(rect.getCenter().x-rect.width/4, rect.getTop().y, rect.height/2, rect.height/2, 0, 360); |
| 58 | break; |
| 59 | case PositionConstants.SOUTH: |
| 60 | graphics.drawLine(rect.getCenter().x,rect.getTop().y,rect.getCenter().x,rect.getCenter().y); |
| 61 | graphics.drawArc(rect.getCenter().x-rect.width/4, rect.getCenter().y, rect.height/2, rect.height/2, 0, 360); |
| 62 | break; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * @return the rectangle surrounding the ( ) part of the figure |
| 68 | * relative to the position of the figure |
| 69 | */ |
| 70 | private Rectangle getBallBounds() { |
| 71 | int side = (getBorderItemLocator() == null ? PositionConstants.WEST : getBorderItemLocator().getCurrentSideOfParent()); |
| 72 | |
| 73 | Rectangle rect = getBounds(); |
| 74 | Rectangle result = null; |
| 75 | |
| 76 | switch(side){ |
| 77 | case PositionConstants.EAST: |
| 78 | result = new Rectangle(rect.getCenter().x, rect.getTop().y+rect.height/4, rect.height/2, rect.height/2); |
| 79 | break; |
| 80 | case PositionConstants.WEST: |
| 81 | result = new Rectangle(rect.getLeft().x, rect.getTop().y+rect.height/4, rect.height/2, rect.height/2); |
| 82 | break; |
| 83 | case PositionConstants.NORTH: |
| 84 | result = new Rectangle(rect.getCenter().x-rect.width/4, rect.getTop().y, rect.height/2, rect.height/2); |
| 85 | break; |
| 86 | case PositionConstants.SOUTH: |
| 87 | result = new Rectangle(rect.getCenter().x-rect.width/4, rect.getCenter().y, rect.height/2, rect.height/2); |
| 88 | break; |
| 89 | } |
| 90 | return result; |
| 91 | } |
| 92 | |
| 93 | /** |
| 94 | * places the anchor point around the ( ) part of the figure |
| 95 | * which is closest to the reference point |
| 96 | */ |
| 97 | private class BallAnchor extends AbstractConnectionAnchor { |
| 98 | |
| 99 | public BallAnchor(IFigure owner) { |
| 100 | super(owner); |
| 101 | } |
| 102 | |
| 103 | public Point getLocation(Point reference) { |
| 104 | Point p = getAnchorPoint(reference); |
| 105 | return p; |
| 106 | } |
| 107 | |
| 108 | private Point getAnchorPoint(Point reference) { |
| 109 | Rectangle r = Rectangle.SINGLETON; |
| 110 | r.setBounds(getBallBounds()); |
| 111 | r.translate(-1, -1); |
| 112 | r.resize(1, 1); |
| 113 | getOwner().translateToAbsolute(r); |
| 114 | |
| 115 | Point ref = r.getCenter().negate().translate(reference); |
| 116 | |
| 117 | if (ref.x == 0) |
| 118 | return new Point(reference.x, (ref.y > 0) ? r.bottom() : r.y); |
| 119 | if (ref.y == 0) |
| 120 | return new Point((ref.x > 0) ? r.right() : r.x, reference.y); |
| 121 | |
| 122 | float dx = (ref.x > 0) ? 0.5f : -0.5f; |
| 123 | float dy = (ref.y > 0) ? 0.5f : -0.5f; |
| 124 | |
| 125 | // ref.x, ref.y, r.width, r.height != 0 => safe to proceed |
| 126 | |
| 127 | float k = (float)(ref.y * r.width) / (ref.x * r.height); |
| 128 | k = k * k; |
| 129 | |
| 130 | return r.getCenter().translate((int)(r.width * dx / Math.sqrt(1 + k)), |
| 131 | (int)(r.height * dy / Math.sqrt(1 + 1 / k))); |
| 132 | } |
| 133 | |
| 134 | } |
| 135 | |
| 136 | protected ConnectionAnchor createAnchorInternal() { |
| 137 | return new BallAnchor(this); |
| 138 | } |
| 139 | |
| 140 | protected ConnectionAnchor createAnchorExternal() { |
| 141 | return new StemAnchor(this); |
| 142 | } |
| 143 | } |