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Center label for polygons #800

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Center label for polygons #800

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73 changes: 43 additions & 30 deletions lib/src/layer/polygon_layer.dart
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
import 'dart:math';
import 'dart:ui';

import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';
import 'package:flutter_map/flutter_map.dart';
import 'package:flutter_map/src/map/map.dart';
Expand Down Expand Up @@ -35,6 +36,8 @@ class Polygon {
final Color borderColor;
final bool disableHolesBorder;
final bool isDotted;
final String label;
final TextStyle labelStyle;
LatLngBounds boundingBox;

Polygon({
Expand All @@ -45,9 +48,9 @@ class Polygon {
this.borderColor = const Color(0xFFFFFF00),
this.disableHolesBorder = false,
this.isDotted = false,
}) : holeOffsetsList = null == holePointsList || holePointsList.isEmpty
? null
: List.generate(holePointsList.length, (_) => []);
this.label,
this.labelStyle = const TextStyle(),
}) : holeOffsetsList = null == holePointsList || holePointsList.isEmpty ? null : List.generate(holePointsList.length, (_) => []);
}

class PolygonLayerWidget extends StatelessWidget {
Expand All @@ -66,8 +69,7 @@ class PolygonLayer extends StatelessWidget {
final MapState map;
final Stream stream;

PolygonLayer(this.polygonOpts, this.map, this.stream)
: super(key: polygonOpts.key);
PolygonLayer(this.polygonOpts, this.map, this.stream) : super(key: polygonOpts.key);

@override
Widget build(BuildContext context) {
Expand Down Expand Up @@ -95,8 +97,7 @@ class PolygonLayer extends StatelessWidget {
}
}

if (polygonOpts.polygonCulling &&
!polygon.boundingBox.isOverlapping(map.bounds)) {
if (polygonOpts.polygonCulling && !polygon.boundingBox.isOverlapping(map.bounds)) {
// skip this polygon as it's offscreen
continue;
}
Expand All @@ -105,11 +106,9 @@ class PolygonLayer extends StatelessWidget {

if (null != polygon.holePointsList) {
for (var i = 0, len = polygon.holePointsList.length; i < len; ++i) {
_fillOffsets(
polygon.holeOffsetsList[i], polygon.holePointsList[i]);
_fillOffsets(polygon.holeOffsetsList[i], polygon.holePointsList[i]);
}
}

polygons.add(
CustomPaint(
painter: PolygonPainter(polygon),
Expand All @@ -132,8 +131,7 @@ class PolygonLayer extends StatelessWidget {
var point = points[i];

var pos = map.project(point);
pos = pos.multiplyBy(map.getZoomScale(map.zoom, map.zoom)) -
map.getPixelOrigin();
pos = pos.multiplyBy(map.getZoomScale(map.zoom, map.zoom)) - map.getPixelOrigin();
offsets.add(Offset(pos.x.toDouble(), pos.y.toDouble()));
if (i > 0) {
offsets.add(Offset(pos.x.toDouble(), pos.y.toDouble()));
Expand Down Expand Up @@ -166,21 +164,17 @@ class PolygonPainter extends CustomPainter {

if (polygonOpt.isDotted) {
var spacing = polygonOpt.borderStrokeWidth * 1.5;
_paintDottedLine(
canvas, polygonOpt.offsets, borderRadius, spacing, borderPaint);
_paintDottedLine(canvas, polygonOpt.offsets, borderRadius, spacing, borderPaint);

if (!polygonOpt.disableHolesBorder &&
null != polygonOpt.holeOffsetsList) {
if (!polygonOpt.disableHolesBorder && null != polygonOpt.holeOffsetsList) {
for (var offsets in polygonOpt.holeOffsetsList) {
_paintDottedLine(
canvas, offsets, borderRadius, spacing, borderPaint);
_paintDottedLine(canvas, offsets, borderRadius, spacing, borderPaint);
}
}
} else {
_paintLine(canvas, polygonOpt.offsets, borderRadius, borderPaint);

if (!polygonOpt.disableHolesBorder &&
null != polygonOpt.holeOffsetsList) {
if (!polygonOpt.disableHolesBorder && null != polygonOpt.holeOffsetsList) {
for (var offsets in polygonOpt.holeOffsetsList) {
_paintLine(canvas, offsets, borderRadius, borderPaint);
}
Expand All @@ -189,8 +183,7 @@ class PolygonPainter extends CustomPainter {
}
}

void _paintDottedLine(Canvas canvas, List<Offset> offsets, double radius,
double stepLength, Paint paint) {
void _paintDottedLine(Canvas canvas, List<Offset> offsets, double radius, double stepLength, Paint paint) {
var startDistance = 0.0;
for (var i = 0; i < offsets.length - 1; i++) {
var o0 = offsets[i];
Expand All @@ -204,15 +197,12 @@ class PolygonPainter extends CustomPainter {
canvas.drawCircle(offset, radius, paint);
distance += stepLength;
}
startDistance = distance < totalDistance
? stepLength - (totalDistance - distance)
: distance - totalDistance;
startDistance = distance < totalDistance ? stepLength - (totalDistance - distance) : distance - totalDistance;
}
canvas.drawCircle(offsets.last, radius, paint);
}

void _paintLine(
Canvas canvas, List<Offset> offsets, double radius, Paint paint) {
void _paintLine(Canvas canvas, List<Offset> offsets, double radius, Paint paint) {
canvas.drawPoints(PointMode.lines, [...offsets, offsets[0]], paint);
for (var offset in offsets) {
canvas.drawCircle(offset, radius, paint);
Expand All @@ -239,9 +229,10 @@ class PolygonPainter extends CustomPainter {
var path = Path();
path.addPolygon(polygonOpt.offsets, true);
canvas.drawPath(path, paint);

if (polygonOpt.label != null) {
_paintText(canvas, polygonOpt.offsets);
}
_paintBorder(canvas);

canvas.restore();
} else {
canvas.clipRect(rect);
Expand All @@ -250,13 +241,35 @@ class PolygonPainter extends CustomPainter {
..color = polygonOpt.color;

var path = Path();

path.addPolygon(polygonOpt.offsets, true);
canvas.drawPath(path, paint);

if (polygonOpt.label != null) {
_paintText(canvas, polygonOpt.offsets);
}
_paintBorder(canvas);
}
}

void _paintText(Canvas canvas, List<Offset> points) {
var dx = points.map((e) => e.dx).toList().fold(0.0, (previousValue, element) => previousValue + element) / points.length;
var dy = points.map((e) => e.dy).toList().fold(0.0, (previousValue, element) => previousValue + element) / points.length;

final textSpan = TextSpan(text: polygonOpt.label, style: polygonOpt.labelStyle);
final textPainter = TextPainter(
text: textSpan,
textAlign: TextAlign.center,
textDirection: TextDirection.ltr,
);
textPainter.layout(minWidth: 0, maxWidth: dx);
dx = dx - textPainter.width / 2;

textPainter.paint(
canvas,
Offset(dx, dy),
);
}

@override
bool shouldRepaint(PolygonPainter other) => false;

Expand Down