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/*
Copyright 2008-2011 Gephi
Authors : Yudi Xue <yudi.xue@usask.ca>, Mathieu Bastian
Website : http://www.gephi.org
This file is part of Gephi.
Gephi is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.
Gephi is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with Gephi. If not, see <http://www.gnu.org/licenses/>.
*/
package org.gephi.preview.plugin.renderers;
import java.awt.Color;
import java.util.Locale;
import org.gephi.graph.api.Edge;
import org.gephi.graph.api.Node;
import org.gephi.preview.api.Item;
import org.gephi.preview.api.PreviewModel;
import org.gephi.preview.api.PreviewProperties;
import org.gephi.preview.api.PreviewProperty;
import org.gephi.preview.api.ProcessingTarget;
import org.gephi.preview.api.RenderTarget;
import org.gephi.preview.api.SVGTarget;
import org.gephi.preview.plugin.items.EdgeItem;
import org.gephi.preview.plugin.items.NodeItem;
import org.gephi.preview.spi.Renderer;
import org.gephi.preview.types.EdgeColor;
import org.openide.util.NbBundle;
import org.openide.util.lookup.ServiceProvider;
import org.w3c.dom.Element;
import processing.core.PGraphics;
import processing.core.PVector;
/**
*
* @author Yudi Xue, Mathieu Bastian
*/
@ServiceProvider(service = Renderer.class, position = 100)
public class EdgeRenderer implements Renderer {
//Custom properties
public static final String EDGE_MIN_WEIGHT = "edge.min-weight";
public static final String EDGE_MAX_WEIGHT = "edge.max-weight";
public static final String BEZIER_CURVENESS = "edge.bezier-curveness";
public static final String SOURCE = "edge.source";
public static final String TARGET = "edge.target";
public static final String TARGET_RADIUS = "edge.target.radius";
//Default values
private boolean defaultShowEdges = true;
private float defaultThickness = 1;
private boolean defaultRescaleWeight = true;
private EdgeColor defaultColor = new EdgeColor(EdgeColor.Mode.MIXED);
private boolean defaultEdgeCurved = true;
private float defaultBezierCurviness = 0.2f;
private int defaultOpacity = 100;
public void preProcess(PreviewModel previewModel) {
PreviewProperties properties = previewModel.getProperties();
Item[] edgeItems = previewModel.getItems(Item.EDGE);
//Put nodes in edge item
for (Item item : edgeItems) {
Edge edge = (Edge) item.getSource();
Node source = edge.getSource().getNodeData().getRootNode();
Node target = edge.getTarget().getNodeData().getRootNode();
Item nodeSource = previewModel.getItem(Item.NODE, source);
Item nodeTarget = previewModel.getItem(Item.NODE, target);
item.setData(SOURCE, nodeSource);
item.setData(TARGET, nodeTarget);
}
//Calculate max and min weight
float minWeight = Float.POSITIVE_INFINITY;
float maxWeight = Float.NEGATIVE_INFINITY;
for (Item edge : edgeItems) {
minWeight = Math.min(minWeight, (Float) edge.getData(EdgeItem.WEIGHT));
maxWeight = Math.max(maxWeight, (Float) edge.getData(EdgeItem.WEIGHT));
}
properties.putValue(EDGE_MIN_WEIGHT, minWeight);
properties.putValue(EDGE_MAX_WEIGHT, maxWeight);
//Put bezier curveness in properties
if (!properties.hasProperty(BEZIER_CURVENESS)) {
properties.putValue(BEZIER_CURVENESS, defaultBezierCurviness);
}
//Rescale weight if necessary - and avoid negative weights
boolean rescaleWeight = properties.getBooleanValue(PreviewProperty.EDGE_RESCALE_WEIGHT);
for (Item item : edgeItems) {
float weight = (Float) item.getData(EdgeItem.WEIGHT);
//Rescale weight
if (rescaleWeight) {
if (!Double.isInfinite(minWeight) && !Double.isInfinite(maxWeight) && maxWeight != minWeight) {
float ratio = 1f / (maxWeight - minWeight);
weight = (weight - minWeight) * ratio;
}
} else if (minWeight <= 0) {
//Avoid negative weight
weight += Math.abs(minWeight) + 1;
}
//Multiply by thickness
weight *= properties.getFloatValue(PreviewProperty.EDGE_THICKNESS);
item.setData(EdgeItem.WEIGHT, weight);
}
//Target radius
for (Item item : edgeItems) {
if ((Boolean) item.getData(EdgeItem.DIRECTED) && !(Boolean) item.getData(EdgeItem.SELF_LOOP)) {
Item targetItem = (Item) item.getData(TARGET);
Float weight = item.getData(EdgeItem.WEIGHT);
float radius = properties.getFloatValue(PreviewProperty.ARROW_RADIUS);
float size = properties.getFloatValue(PreviewProperty.ARROW_SIZE) * weight;
radius = -(radius + (Float) targetItem.getData(NodeItem.SIZE) / 2f + properties.getFloatValue(PreviewProperty.NODE_BORDER_WIDTH));
item.setData(TARGET_RADIUS, radius - size);
}
}
}
public void render(Item item, RenderTarget target, PreviewProperties properties) {
//Get nodes
Item sourceItem = item.getData(SOURCE);
Item targetItem = item.getData(TARGET);
//Weight and color
Float weight = item.getData(EdgeItem.WEIGHT);
EdgeColor edgeColor = (EdgeColor) properties.getValue(PreviewProperty.EDGE_COLOR);
Color color = edgeColor.getColor((Color) item.getData(EdgeItem.COLOR),
(Color) sourceItem.getData(NodeItem.COLOR),
(Color) targetItem.getData(NodeItem.COLOR));
int alpha = (int) ((properties.getIntValue(PreviewProperty.EDGE_OPACITY) / 100f) * 255f);
color = new Color(color.getRed(), color.getGreen(), color.getBlue(), alpha);
if (sourceItem == targetItem) {
renderSelfLoop(sourceItem, weight, color, properties, target);
} else if (properties.getBooleanValue(PreviewProperty.EDGE_CURVED)) {
renderCurvedEdge(item, sourceItem, targetItem, weight, color, properties, target);
} else {
renderStraightEdge(item, sourceItem, targetItem, weight, color, properties, target);
}
}
public void renderSelfLoop(Item nodeItem, float thickness, Color color, PreviewProperties properties, RenderTarget renderTarget) {
Float x = nodeItem.getData(NodeItem.X);
Float y = nodeItem.getData(NodeItem.Y);
Float size = nodeItem.getData(NodeItem.SIZE);
Node node = (Node) nodeItem.getSource();
PVector v1 = new PVector(x, y);
v1.add(size, -size, 0);
PVector v2 = new PVector(x, y);
v2.add(size, size, 0);
if (renderTarget instanceof ProcessingTarget) {
PGraphics graphics = ((ProcessingTarget) renderTarget).getGraphics();
graphics.strokeWeight(thickness);
graphics.stroke(color.getRed(), color.getGreen(), color.getBlue(), color.getAlpha());
graphics.noFill();
graphics.bezier(x, y, v1.x, v1.y, v1.x, v2.y, x, y);
} else if (renderTarget instanceof SVGTarget) {
SVGTarget svgTarget = (SVGTarget) renderTarget;
Element selfLoopElem = svgTarget.createElement("path");
selfLoopElem.setAttribute("d", String.format(Locale.ENGLISH, "M %f,%f C %f,%f %f,%f %f,%f",
x, y, v1.x, v1.y, v2.x, v2.y, x, y));
selfLoopElem.setAttribute("class", node.getNodeData().getId());
selfLoopElem.setAttribute("stroke", svgTarget.toHexString(color));
selfLoopElem.setAttribute("stroke-opacity", (color.getAlpha() / 255f) + "");
selfLoopElem.setAttribute("stroke-width", Float.toString(thickness * svgTarget.getScaleRatio()));
selfLoopElem.setAttribute("fill", "none");
svgTarget.getTopElement(SVGTarget.TOP_EDGES).appendChild(selfLoopElem);
}
}
public void renderCurvedEdge(Item edgeItem, Item sourceItem, Item targetItem, float thickness, Color color, PreviewProperties properties, RenderTarget renderTarget) {
Edge edge = (Edge) edgeItem.getSource();
Float x1 = sourceItem.getData(NodeItem.X);
Float x2 = targetItem.getData(NodeItem.X);
Float y1 = sourceItem.getData(NodeItem.Y);
Float y2 = targetItem.getData(NodeItem.Y);
//Curved edgs
PVector direction = new PVector(x2, y2);
direction.sub(new PVector(x1, y1));
float length = direction.mag();
direction.normalize();
float factor = properties.getFloatValue(BEZIER_CURVENESS) * length;
// normal vector to the edge
PVector n = new PVector(direction.y, -direction.x);
n.mult(factor);
// first control point
PVector v1 = new PVector(direction.x, direction.y);
v1.mult(factor);
v1.add(new PVector(x1, y1));
v1.add(n);
// second control point
PVector v2 = new PVector(direction.x, direction.y);
v2.mult(-factor);
v2.add(new PVector(x2, y2));
v2.add(n);
if (renderTarget instanceof ProcessingTarget) {
PGraphics graphics = ((ProcessingTarget) renderTarget).getGraphics();
graphics.strokeWeight(thickness);
graphics.stroke(color.getRed(), color.getGreen(), color.getBlue(), color.getAlpha());
graphics.noFill();
graphics.bezier(x1, y1, v1.x, v1.y, v2.x, v2.y, x2, y2);
} else if (renderTarget instanceof SVGTarget) {
SVGTarget svgTarget = (SVGTarget) renderTarget;
Element edgeElem = svgTarget.createElement("path");
edgeElem.setAttribute("class", edge.getSource().getNodeData().getId() + " " + edge.getTarget().getNodeData().getId());
edgeElem.setAttribute("d", String.format(Locale.ENGLISH, "M %f,%f C %f,%f %f,%f %f,%f",
x1, y1, v1.x, v1.y, v2.x, v2.y, x2, y2));
edgeElem.setAttribute("stroke", svgTarget.toHexString(color));
edgeElem.setAttribute("stroke-width", Float.toString(thickness * svgTarget.getScaleRatio()));
edgeElem.setAttribute("stroke-opacity", (color.getAlpha() / 255f) + "");
edgeElem.setAttribute("fill", "none");
svgTarget.getTopElement(SVGTarget.TOP_EDGES).appendChild(edgeElem);
}
}
public void renderStraightEdge(Item edgeItem, Item sourceItem, Item targetItem, float thickness, Color color, PreviewProperties properties, RenderTarget renderTarget) {
Edge edge = (Edge) edgeItem.getSource();
Float x1 = sourceItem.getData(NodeItem.X);
Float x2 = targetItem.getData(NodeItem.X);
Float y1 = sourceItem.getData(NodeItem.Y);
Float y2 = targetItem.getData(NodeItem.Y);
//Target radius - to start at the base of the arrow
Float targetRadius = edgeItem.getData(TARGET_RADIUS);
if (targetRadius != 0) {
PVector direction = new PVector(x2, y2);
direction.sub(new PVector(x1, y1));
direction.normalize();
direction = new PVector(direction.x, direction.y);
direction.mult(targetRadius);
direction.add(new PVector(x2, y2));
x2 = direction.x;
y2 = direction.y;
}
if (renderTarget instanceof ProcessingTarget) {
PGraphics graphics = ((ProcessingTarget) renderTarget).getGraphics();
graphics.strokeWeight(thickness);
graphics.strokeCap(PGraphics.SQUARE);
graphics.stroke(color.getRed(), color.getGreen(), color.getBlue(), color.getAlpha());
graphics.noFill();
graphics.line(x1, y1, x2, y2);
} else if (renderTarget instanceof SVGTarget) {
SVGTarget svgTarget = (SVGTarget) renderTarget;
Element edgeElem = svgTarget.createElement("path");
edgeElem.setAttribute("class", edge.getSource().getNodeData().getId() + " " + edge.getTarget().getNodeData().getId());
edgeElem.setAttribute("d", String.format(Locale.ENGLISH, "M %f,%f L %f,%f",
x1, y1, x2, y2));
edgeElem.setAttribute("stroke", svgTarget.toHexString(color));
edgeElem.setAttribute("stroke-width", Float.toString(thickness * svgTarget.getScaleRatio()));
edgeElem.setAttribute("stroke-opacity", (color.getAlpha() / 255f) + "");
edgeElem.setAttribute("fill", "none");
svgTarget.getTopElement(SVGTarget.TOP_EDGES).appendChild(edgeElem);
}
}
public PreviewProperty[] getProperties() {
return new PreviewProperty[]{
PreviewProperty.createProperty(this, PreviewProperty.SHOW_EDGES, Boolean.class,
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.property.display.displayName"),
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.property.display.description"),
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.category")).setValue(defaultShowEdges),
PreviewProperty.createProperty(this, PreviewProperty.EDGE_THICKNESS, Float.class,
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.property.thickness.displayName"),
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.property.thickness.description"),
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.category"), PreviewProperty.SHOW_EDGES).setValue(defaultThickness),
PreviewProperty.createProperty(this, PreviewProperty.EDGE_RESCALE_WEIGHT, Boolean.class,
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.property.rescaleWeight.displayName"),
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.property.rescaleWeight.description"),
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.category"), PreviewProperty.SHOW_EDGES).setValue(defaultRescaleWeight),
PreviewProperty.createProperty(this, PreviewProperty.EDGE_COLOR, EdgeColor.class,
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.property.color.displayName"),
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.property.color.description"),
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.category"), PreviewProperty.SHOW_EDGES).setValue(defaultColor),
PreviewProperty.createProperty(this, PreviewProperty.EDGE_OPACITY, Float.class,
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.property.opacity.displayName"),
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.property.opacity.description"),
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.category"), PreviewProperty.SHOW_EDGES).setValue(defaultOpacity),
PreviewProperty.createProperty(this, PreviewProperty.EDGE_CURVED, Boolean.class,
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.property.curvedEdges.displayName"),
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.property.curvedEdges.description"),
NbBundle.getMessage(EdgeRenderer.class, "EdgeRenderer.category"), PreviewProperty.SHOW_EDGES).setValue(defaultEdgeCurved)};
}
public boolean isRendererForitem(Item item, PreviewProperties properties) {
if (item instanceof EdgeItem && properties.getBooleanValue(PreviewProperty.SHOW_EDGES)
&& !properties.getBooleanValue(PreviewProperty.MOVING)) {
return true;
}
return false;
}
}
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