C# 呼叫 Google Earth COM API 開發（三）：滑鼠雙擊事件與座標取得

透過全域滑鼠鉤子攔截雙擊事件，判斷是否點擊在 Google Earth 渲染區域，若是則取得螢幕座標並轉換為經緯度。

雙擊事件處理

void mouseHook_MouseDbClick(object sender, MouseEventArgs e) {
    IntPtr hWnd = NativeMethods.WindowFromPoint(e.Location);
    if (hWnd == this.GeRenderHWnd) {
        Point pt = this.Control.PointToClient(e.Location);
        if (this.Control.ClientRectangle.Contains(pt)) {
            DoublePoint dp = ((GERenderPanel)Control).DetermineScreenCoordinates(pt.X, pt.Y);
            Thread t = new Thread(ShowMouseDbClickPoint);
            t.Start(dp);
        }
    }
}

void ShowMouseDbClickPoint(object obj) {
    DoublePoint dp = (DoublePoint)obj;
    PointOnTerrainGE pGe = GeApp.GetPointOnTerrainFromScreenCoords(dp.X, dp.Y);
    Console.WriteLine($"雙擊位置：經度={pGe.Longitude}, 緯度={pGe.Latitude}");
    MessageBox.Show("偵測到滑鼠雙擊！");
}

注意：程式碼未包含主視窗焦點檢測，實際部署需自行補強。