/**
* Creates a image of the WFS layer's data
*
* @return image
*/
private BufferedImage draw() {
MapContent content = new MapContent();
MapViewport viewport = new MapViewport();
CoordinateReferenceSystem crs = location.getCrs();
ReferencedEnvelope bounds = location.getEnvelope();
Rectangle screenArea;
if (isTile && bufferSize != 0.0d) {
double width = (location.getRight() - location.getLeft()) / 2 * bufferSize;
double height = (location.getTop() - location.getBottom()) / 2 * bufferSize;
bounds = location.createEnlargedEnvelope(width, height);
screenArea = new Rectangle(0, 0, bufferedImageWidth, bufferedImageHeight);
} else {
screenArea = new Rectangle(0, 0, imageWidth, imageHeight); // image size
}
viewport.setCoordinateReferenceSystem(crs);
viewport.setScreenArea(screenArea);
viewport.setBounds(bounds);
viewport.setMatchingAspectRatio(true);
if (features.size() > 0) {
Layer featureLayer = new FeatureLayer(features, style);
content.addLayer(featureLayer);
}
content.setViewport(viewport);
return saveImage(content);
}
@Override
public void draw(Graphics2D g2d, MapContent map, MapViewport viewport) {
if (map != null && this.map == null) {
this.map = map;
}
if (viewport == null) {
viewport = map.getViewport(); // use the map viewport if one has not been provided
}
if (viewport == null || viewport.getScreenArea() == null) {
return; // renderer is not set up for use yet
}
if (collection != null && signsdb == null) {
signsdb = new Hashtable();
for (Iterator it1 = collection.iterator(); it1.hasNext(); ) {
SimpleFeature feature = (SimpleFeature) it1.next();
StructOffset offset = new StructOffset(0, 0, -1);
signsdb.put(feature, offset);
}
}
// 消除线条锯齿
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
DefaultFeatureCollection collection = this.getCollection();
// 遍历得到每个SimpleFeature
for (Iterator it1 = collection.iterator(); it1.hasNext(); ) {
SimpleFeature feature = (SimpleFeature) it1.next();
String id = feature.getID();
DirectPosition2D geoCoords = null;
DirectPosition2D signCoords = null;
Point point = (Point) feature.getAttribute("the_geom");
if (point != null) {
// 保存前一次刷新所处的位置
double x = point.getX();
double y = point.getY();
geoCoords = new DirectPosition2D(x, y);
}
// 经纬度坐标转换为屏幕坐标
MathTransform transform_math;
try {
transform_math =
CRS.findMathTransform(
DefaultGeographicCRS.WGS84, viewport.getCoordinateReferenceSystem(), true);
transform_math.transform(geoCoords, geoCoords);
AffineTransform transform_affine = viewport.getWorldToScreen();
transform_affine.transform(geoCoords, geoCoords);
g2d.setColor(Color.CYAN);
g2d.drawOval((int) geoCoords.x, (int) geoCoords.y, 10, 10);
// 如果被选中，填充空心成实体
if (id.equals(selectedId)) g2d.fillOval((int) geoCoords.x, (int) geoCoords.y, 10, 10);
if (signsdb.get(feature) != null) {
StructOffset offset = (StructOffset) (signsdb.get(feature));
double offsetX = offset.getX();
double offsetY = offset.getY();
signCoords = new DirectPosition2D(geoCoords.x + offsetX, geoCoords.y + offsetY);
}
if (signCoords != null) {
// 坐标默认偏移量<-25,-60>
int width = 60, height = 40;
g2d.setColor(Color.CYAN);
g2d.drawLine(
(int) geoCoords.x + 5,
(int) geoCoords.y + 5,
(int) signCoords.x + offsetX + width / 2,
(int) signCoords.y + offsetY + height / 2);
g2d.setColor(Color.BLACK);
g2d.drawRect((int) signCoords.x + offsetX, (int) signCoords.y + offsetY, width, height);
g2d.setColor(Color.ORANGE);
g2d.fillRect((int) signCoords.x + offsetX, (int) signCoords.y + offsetY, width, height);
g2d.setColor(Color.RED);
String signsText = (String) feature.getAttribute("name");
g2d.drawString(
signsText, (int) signCoords.x + offsetX + 2, (int) signCoords.y + offsetY + 12);
}
} catch (Exception e) {
e.printStackTrace();
}
}
// 绘制指南针
// int x[] = {20,10,20,30};
// int y[] = {10,20,30,20};
// int nPoint = 4;
// g2d.drawPolygon(x, y, nPoint);
String APP_PATH = "";
Bundle bundle = Platform.getBundle("MapControl");
try {
APP_PATH =
FileLocator.resolve(bundle.getEntry("")).getPath().substring(1) + "icons/map/compass.png";
} catch (Exception e) {
System.out.println(e.getMessage());
System.exit(1);
}
Image src = Toolkit.getDefaultToolkit().getImage(APP_PATH);
double dx = 0.72, dy = 0.72;
double x = 10, y = 10; // 指南针左上角
g2d.rotate(
-MainMapViewPart.rotateAngle + (Math.PI / 360) * 40,
x + dx * src.getWidth(null) / 2,
y + dy * src.getHeight(null) / 2);
AffineTransform affine = new AffineTransform();
affine.setToTranslation(x, y);
affine.scale(dx, dy); // 缩放图片
g2d.drawImage(src, affine, null);
}