SharpMap学习6-模拟数据流-数据显示

数据显示最终归结为Map对象的自我绘制

 

最终通过GetMap对象返回一个Image对象来完成：

public Image GetMap()

{

    if (this.layers == null || this.layers.Count == 0)

    {

        throw new InvalidOperationException("没有图层信息");

    }

    Image img = new Bitmap(this.mapSize.Width, this.mapSize.Height);

    Graphics g = Graphics.FromImage(img);

    g.Clear(this.backColor);

    g.PageUnit = GraphicsUnit.Pixel;

    foreach (VectorLayer layerItem in this.layers)

    {

        if (layerItem != null)

        {

            layerItem.DrawLayer(g, drawingStyle);

        }

    }

    g.Dispose();

    return img;

}