## 一、前言说明
现在流行无人机和机器人，未来这块的增量是巨大的，地图组件也顺势而为，之前用web版本的地图组件绘制100个无人机，还行，就是耗时比较多，而且占用内存较大，性能较低，如果是1000个，那基本上歇菜，根本都无法完成，毕竟在web的地图组件中，marker对象是一个很多参数的对象，每一个都需要分配不少的内存，不适合大量的对象，在花了巨大精力用纯QPainter实现这个widget版本的地图组件，本着百倍性能提升的目标去的，亲自验证了下，1000个无人机只需要7ms就完成，不要太好，可以说是瞬间完成，各位web程序员还把web吹上天，在很多大量绘制场景中，还是必须cs架构的软件更擅长。
## 二、效果图

## 三、相关代码
```cpp
#include "frmmarker.h"
#include "ui_frmmarker.h"
#include "qthelper.h"
#include "maphelper.h"
#include "maputil.h"
#include "overlaybase.h"
#include "overlayhelper.h"
frmMarker::frmMarker(QWidget *parent) : QWidget(parent), ui(new Ui::frmMarker)
{
ui->setupUi(this);
this->initForm();
this->initConfig();
this->loadMap();
}
frmMarker::~frmMarker()
{
delete ui;
}
void frmMarker::initForm()
{
offset = 5;
flag = "marker";
marker = NULL;
ui->mapWidget->setFlag("frmMarker");
connect(ui->mapWidget, SIGNAL(receivePoint(qreal, qreal)), this, SLOT(receivePoint(qreal, qreal)));
}
void frmMarker::initConfig()
{
MapHelper::loadTileSource(ui->cboxTileSource, AppConfig::MarkerSource);
connect(ui->cboxTileSource, SIGNAL(currentIndexChanged(int)), this, SLOT(saveConfig()));
connect(ui->cboxTileSource, SIGNAL(currentIndexChanged(int)), this, SLOT(loadMap()));
MapHelper::loadTileType(ui->cboxTileType, AppConfig::MarkerType);
connect(ui->cboxTileType, SIGNAL(currentIndexChanged(int)), this, SLOT(saveConfig()));
connect(ui->cboxTileType, SIGNAL(currentIndexChanged(int)), this, SLOT(loadMap()));
ui->cboxOffline->setCurrentIndex(AppConfig::MarkerOffline);
connect(ui->cboxOffline, SIGNAL(currentIndexChanged(int)), this, SLOT(saveConfig()));
connect(ui->cboxOffline, SIGNAL(currentIndexChanged(int)), this, SLOT(loadMap()));
ui->cboxCache->setCurrentIndex(AppConfig::MarkerCache);
connect(ui->cboxCache, SIGNAL(currentIndexChanged(int)), this, SLOT(saveConfig()));
connect(ui->cboxCache, SIGNAL(currentIndexChanged(int)), this, SLOT(loadMap()));
MapHelper::loadAlignType(ui->cboxMarkerAlign, 5);
MapHelper::loadAlignType(ui->cboxTextAlign, 4);
ui->cboxFontSize->setCurrentIndex(2);
ui->cboxNumber->setCurrentIndex(2);
ui->cboxTextColor->setColorName("red");
ui->cboxTextBgColor->setColorName("black");
ui->cboxTextBorderColor->setColorName("blue");
}
void frmMarker::saveConfig()
{
AppConfig::MarkerSource = ui->cboxTileSource->itemData(ui->cboxTileSource->currentIndex()).toInt();
AppConfig::MarkerType = ui->cboxTileType->itemData(ui->cboxTileType->currentIndex()).toInt();
AppConfig::MarkerOffline = ui->cboxOffline->currentIndex();
AppConfig::MarkerCache = ui->cboxCache->currentIndex();
AppConfig::writeConfig();
}
void frmMarker::loadMap()
{
on_btnClearMarker_clicked();
int tileSource = ui->cboxTileSource->itemData(ui->cboxTileSource->currentIndex()).toInt();
ui->mapWidget->setTileSource(TileSource(tileSource));
int tileType = ui->cboxTileType->itemData(ui->cboxTileType->currentIndex()).toInt();
ui->mapWidget->setTileType(TileType(tileType));
QString offlinePath = TileHelper::getOfflinePath(TileSource(tileSource));
ui->mapWidget->setOffline(ui->cboxOffline->currentIndex() == 1);
ui->mapWidget->setOfflinePath(offlinePath);
QString cachePath = (ui->cboxCache->currentIndex() == 1 ? QtHelper::appPath() + "/mapcache" : "");
ui->mapWidget->setCachePath(cachePath);
ui->mapWidget->load();
}
void frmMarker::receivePoint(qreal lng, qreal lat)
{
ui->txtL