更快，更有效的颜色和尺寸选择方法 [英] Faster and Efficient Method to Choose Color and Size

问题描述

我需要向地图添加不同颜色的圆.我正在使用bing地图.在此之上，通过以下方法添加图层:

I need to add Circles of different colors to the map. I am using bing Maps. On top of this adding Layers by following method:

MapLayer RedLayer = new MapLayer();

MapLayer RedLayer = new MapLayer();

MapLayer BlueLayer =新的MapLayer();

MapLayer BlueLayer = new MapLayer();

MapLayer YellowLayer = new MapLayer();

MapLayer YellowLayer = new MapLayer();

MapLayer  OrangeLayer = new MapLayer();

MapLayer  OrangeLayer = new MapLayer();

AddLayer(MapLayer colorLayer，整数大小，SolidColorBrush颜色)

AddLayer(MapLayer colorLayer, int size, SolidColorBrush color)

 此处最后一个参数颜色是根据时间范围设置的.例如:1990-1999年是红色，2000-2009年是蓝色.

 Here the last argument color is set depending on time range. ex: 1990-1999 is Red, 2000-2009 Blue.

需要传递相同颜色的MapLayer.

The same color MapLayer needs to be passed. 

大小需要通过输入列表中元素的数量来计算.如果inputSize> 10000  size = 90

The size needs to be calculated by number of elements in a input list. If inputSize > 10000  size = 90

  5000< inputSize<< 10000，然后大小= 60.  最佳使用方法是什么?我不想使用switch或其他方法.

 5000 < inputSize < 10000 then size =60.  What is the best method to use ? I don't want to use switch or if else methods.

推荐答案

嗨wpf_xam1，

Hi  wpf_xam1,

>>最佳使用方法是什么?我不想使用switch或其他方法.

如果您不想使用开关或其他方法.色彩转换器可能是您尝试的一种合适方法.

If you don't want to use a switch or if else methods. May be the Color Converter is a suitable way for you to try.

以下代码供您参考.

            ColorConverterTest cctt = new ColorConverterTest();
            Binding binding = new Binding("Item.Items");
            binding.Converter = cctt;
            textttxrich.SetBinding(TextBlock.ForegroundProperty, binding);


     class ColorConverterTest : ValidationRule, IValueConverter
    {
        public override ValidationResult Validate(object value, CultureInfo culture)
        {
            return new ValidationResult(ConvertBack(value, typeof(string), null, culture) != DependencyProperty.UnsetValue,
           "Please enter valid value");
        }

        public object Convert(object value, Type typeTarget, object param, CultureInfo culture)
        {
            if ((string)value == "1")
            {
                return "Green";
                //return Colors.Green;
            }
            else if ((string)value == "2")
            {
                return "Yellow";
                // return Colors.Yellow;
            }
            else if ((string)value == "3")
            {
                return "Red";
                // return Colors.Red;
            }      
            return "Red";
        }
        public object ConvertBack(object value, Type typeTarget, object param, CultureInfo culture)
        {
            if (value == null || value.ToString().Trim().Length == 0) return null;
            string s = value.ToString();
            if(s!="-1")
            {
                return s;
            }
            return DependencyProperty.UnsetValue;
        }
    }

如果您对必应地图有任何疑问，请访问必应地图论坛以获取适当的帮助.

If you have any question about bing Maps, please go to the bing Maps forum for getting suitable help.

Bing Maps WPF，WP7/8/8.1，Silverlight论坛:
https://social.msdn.microsoft.com/Forums/en-US/home? category = bingmaps

Bing Maps WPF, WP7/8/8.1, Silverlight forum:
https://social.msdn.microsoft.com/Forums/en-US/home?category=bingmaps

最好的问候，

吕汉楠

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