Arrow length indicators for flow magnitude

[simantics/district.git] / org.simantics.district.network.ui / src / org / simantics / district / network / ui / nodes / DistrictNetworkEdgeNode.java

diff --git a/org.simantics.district.network.ui/src/org/simantics/district/network/ui/nodes/DistrictNetworkEdgeNode.java b/org.simantics.district.network.ui/src/org/simantics/district/network/ui/nodes/DistrictNetworkEdgeNode.java
index a4f348eb11e1314b0b07119a7adf235861b453dc..21f3d741e77d81755376faa7047b3762266d0a92 100644 (file)
--- a/org.simantics.district.network.ui/src/org/simantics/district/network/ui/nodes/DistrictNetworkEdgeNode.java
+++ b/org.simantics.district.network.ui/src/org/simantics/district/network/ui/nodes/DistrictNetworkEdgeNode.java
@@ -5,6 +5,7 @@ import java.awt.Color;
 import java.awt.Graphics2D;
 import java.awt.RenderingHints;
 import java.awt.geom.AffineTransform;
+import java.awt.geom.Line2D;
 import java.awt.geom.Path2D;
 import java.awt.geom.Point2D;
 import java.awt.geom.Rectangle2D;
@@ -44,11 +45,18 @@ public class DistrictNetworkEdgeNode extends G2DParentNode implements ISelection
     private static final double height = 0.5;
 
     private static final Rectangle2D NORMAL = new Rectangle2D.Double(left, top, width, height);
-    
+
     private transient Point2D centerPoint;
     private transient Rectangle2D symbolRect;
     private transient AffineTransform symbolTransform;
-    
+
+    private Double arrowLength;
+
+    private static double startX;
+    private static double startY;
+    private static double endX;
+    private static double endY;
+
     @Override
     public void init() {
     }
@@ -90,6 +98,37 @@ public class DistrictNetworkEdgeNode extends G2DParentNode implements ISelection
         g2d.setStroke(bs);
         g2d.draw(path);
 
+        // Draw arrow
+        if (arrowLength != null) {
+            g2d.setColor(Color.BLACK);
+            g2d.setStroke(new BasicStroke(bs.getLineWidth(), BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL));
+            
+            double l = arrowLength;
+            double w = 2 * (double) bs.getLineWidth() * Math.signum(l);
+            if (Math.abs(w) > Math.abs(l)) w = l;
+            double offset = 2 * (double) bs.getLineWidth();
+            
+            double centerX = (startX + endX) / 2, centerY = (startY + endY) / 2;
+            double deltaX = endX - startX, deltaY = endY - startY;
+            double length = Math.sqrt(deltaX * deltaX + deltaY * deltaY);
+            deltaX /= length;
+            deltaY /= length;
+            
+            double x0 = centerX - l/2 * deltaX + offset * deltaY;
+            double y0 = centerY - l/2 * deltaY - offset * deltaX;
+            double x1 = centerX + (l/2 - w) * deltaX + offset * deltaY;
+            double y1 = centerY + (l/2 - w) * deltaY - offset * deltaX;
+            
+            g2d.draw(new Line2D.Double(x0, y0, x1, y1));
+            
+            Path2D path = new Path2D.Double();
+            path.moveTo(x1 + w * deltaX, y1 + w * deltaY);
+            path.lineTo(x1 + w * deltaY, y1 - w * deltaX);
+            path.lineTo(x1 - w * deltaY, y1 + w * deltaX);
+            path.closePath();
+            g2d.fill(path);
+        }
+        
         // Reset
         g2d.setStroke(oldStroke);
         g2d.setColor(oldColor);
@@ -141,11 +180,10 @@ public class DistrictNetworkEdgeNode extends G2DParentNode implements ISelection
 //    }
 
     public static Path2D calculatePath(DistrictNetworkEdge edge, Path2D result, boolean detailed) {
-        // Convert to screen coordinates
-        double startX = ModelledCRS.longitudeToX(edge.getStartPoint().getX());
-        double startY = ModelledCRS.latitudeToY(-edge.getStartPoint().getY()); // Invert for Simantics
-        double endX = ModelledCRS.longitudeToX(edge.getEndPoint().getX());
-        double endY = ModelledCRS.latitudeToY(-edge.getEndPoint().getY());// Invert for Simantics
+        startX = ModelledCRS.longitudeToX(edge.getStartPoint().getX());
+        startY = ModelledCRS.latitudeToY(-edge.getStartPoint().getY());
+        endX = ModelledCRS.longitudeToX(edge.getEndPoint().getX());
+        endY = ModelledCRS.latitudeToY(-edge.getEndPoint().getY());
 
         if (result == null) {
              result = new Path2D.Double();
@@ -211,6 +249,11 @@ public class DistrictNetworkEdgeNode extends G2DParentNode implements ISelection
     public void setDynamicColor(Color color) {
         this.dynamicColor = color;
     }
+    
+    @PropertySetter(value = "arrowLength")
+    public void setArroLength(Double length) {
+        arrowLength = length;
+    }
 
     @PropertySetter(value = "SVG")
     public void setSVG(String value) {