通過 在線geoJSON 繪製 http://geojson.io/#map=8/29.993/101.667
效果：
繪製效果：
測試數據點位：
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首先需要把隔點數據初始化成表結構類型
這種數據結構
通過Wcontour 構建一個虛擬表
//繪線網格
List<Border> _borders = Contour.tracingBorders(data, _X, _Y, S1, _undefData);
再生成等值線
// 生成等值線
cPolylineList = Contour.tracingContourLines(data, _X, _Y, dataInterval.length, dataInterval, _undefData, _borders, S1);
cPolylineList = Contour.smoothLines(cPolylineList);// 平滑
再將數據打包成List 等值線數組
cPolygonList = Contour.tracingPolygons(data, cPolylineList, _borders, dataInterval);
再通過組裝geoJson
private String getPolygonGeoJson(List<Polygon> cPolygonList) {
String geo = null;
String geometry = " { \"type\":\"Feature\",\"geometry\":";
String properties = ",\"properties\":{ \"hvalue\":";
String head = "{\"type\": \"FeatureCollection\"," + "\"features\": [";
String end = " ] }";
if (cPolygonList == null || cPolygonList.size() == 0) {
return null;
}
try {
for (Polygon pPolygon : cPolygonList) {
List<Object> ptsTotal = new ArrayList<Object>();
List<Object> pts = new ArrayList<Object>();
PolyLine pline = pPolygon.OutLine;
for (PointD ptD : pline.PointList) {
List<Double> pt = new ArrayList<Double>();
pt.add(ptD.X);
pt.add(ptD.Y);
pts.add(pt);
}
ptsTotal.add(pts);
if (pPolygon.HasHoles()) {
for (PolyLine cptLine : pPolygon.HoleLines) {
List<Object> cpts = new ArrayList<Object>();
for (PointD ccptD : cptLine.PointList) {
List<Double> pt = new ArrayList<Double>();
pt.add(ccptD.X);
pt.add(ccptD.Y);
cpts.add(pt);
}
if (cpts.size() > 0) {
ptsTotal.add(cpts);
}
}
}
JSONObject js = new JSONObject();
js.put("type", "Polygon");
js.put("coordinates", ptsTotal);
double hv = pPolygon.HighValue;
double lv = pPolygon.LowValue;
if (hv == lv) {
if (pPolygon.IsClockWise) {
if (!pPolygon.IsHighCenter) {
hv = hv - 0.1;
lv = lv - 0.1;
}
} else {
if (!pPolygon.IsHighCenter) {
hv = hv - 0.1;
lv = lv - 0.1;
}
}
} else {
if (!pPolygon.IsClockWise) {
lv = lv + 0.1;
} else {
if (pPolygon.IsHighCenter) {
hv = hv - 0.1;
}
}
}
geo = geometry + js.toString() + properties + hv
+ ", \"lvalue\":" + lv + "} }" + "," + geo;
}
if (geo.contains(",")) {
geo = geo.substring(0, geo.lastIndexOf(","));
}
geo = head + geo + end;
} catch (Exception e) {
e.printStackTrace();
return geo;
}
return geo;
}
最後生成geoJson 字符串。
有了geoJson 串生成等值線圖片就已經完成一半，接着用Graphics2D 來繪製我們的等值線
首先 需要確定的是我們繪製的點也就是經緯度的起始位置和結束位置，通過經緯度轉像素點的方式在自己的畫布上位置繪製我們的圖形
public void draw(String backgroundImagePath, String imageSavePath, String geojson) {
try {
// 得到Graphics2D 對象
BufferedImage saveImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
Graphics2D graphics2d = saveImage.createGraphics();
graphics2d.setBackground(Color.black);
// 獲取底圖寬高
marginWidth = width / 100;
marginHeight = height / 100;
//// // 繪製等值線
drawIsopleth(graphics2d , geojson);
graphics2d.dispose();
File f = new File(imageSavePath);
if (f.exists()) {
f.delete();
}
ImageIO.write(saveImage, "PNG", f);
} catch (Exception e) {
e.printStackTrace();
}
}
/**
*
* TODO(繪製等值線)
* @param graphics2d
* @param geojson
* @return: void
* @throws
*/
public void drawIsopleth(Graphics2D graphics2d, String geojson) {
if(geojson == null) {
return ;
}
JSONObject obj = JSON.parseObject(geojson);
List<JSONObject> list = obj.getObject("features",List.class);
int count = 0;
for (JSONObject item : list) {
double hvalue = item.getJSONObject("properties").getDoubleValue("hvalue");
//這裏顏色可以自己定義
graphics2d.setColor(getRGB(hvalue));
JSONObject geometry = item.getJSONObject("geometry");
if(hvalue >= 1) {//條件也可以自己定義
//繪製多面
drawMultiPolygon(graphics2d,geometry.getJSONArray("coordinates"));
}
count+=20;
}
}
繪製等值線，通過經緯度轉像素方法
/**
* 將經緯度座標變換到圖片像素座標
*
* @param coord
* @return
*/
public double[] transferCoord(double[] coord) {
int h = 1000;
int w = 1000;
//雅安經緯度地理座標區域的範圍
double left = 101.91;
double right = 103.395;
double bottom = 28.845;
double top = 30.935;
//將參照點經緯度轉化爲弧度，並得到之後計算橫軸縱軸上距離的中間量。
double scaleX = ((right-left)*3600)/h;
double scaleY = ((top-bottom)*3600)/w;
double x = (coord[0] - left)*3600/scaleX;
double y = (top - coord[1])*3600/scaleY;
return new double[] { x , y };
}
最後繪製出自己的矢量圖