/// <summary>
/// 合并图片
/// </summary>
/// <param name="imgBack">背景图片</param>
/// <param name="img">需要嵌套的图片</param>
/// <param name="position">需要嵌套的图片的位置</param>
/// <returns></returns>
public static Image CombineImage(Image imgBack, Image img, ImgPosition position, Graphics g = null, float?x = null, float?y = null)
{
bool isNeedDispose = false;
if (g == null)
{
g = Graphics.FromImage(imgBack);
isNeedDispose = true;
}
//呈现质量
g.SmoothingMode = SmoothingMode.AntiAlias;
//画需要嵌套的图片
PointF point = GetPosition(imgBack, img, position, x, y);
g.DrawImage(img, point.X, point.Y);
img.Dispose();
if (isNeedDispose)
{
g.Dispose();
}
return(imgBack);
}
/// <summary>
/// 将二维码画在白色背景图上
/// </summary>
/// <param name="img">二维码</param>
/// <returns></returns>
public static Image CreateWhiteBmp(Image bmp, Image img, ImgPosition imgPosition)
{
Graphics g = Graphics.FromImage(bmp);
//呈现质量
g.SmoothingMode = SmoothingMode.AntiAlias;
//定义画布颜色
g.Clear(Color.White);
//再画需要嵌套的图片
PointF point = GetPosition(bmp, img, imgPosition);
g.DrawImage(img, point.X, point.Y);
img.Dispose();
g.Dispose();
return(bmp);
}
/// <summary>
/// 获取需要嵌套的图片的左上角的坐标
/// </summary>
/// <param name="imgBack">背景图片</param>
/// <param name="img">需要嵌套的图片</param>
/// <param name="position">位置枚举</param>
/// <returns></returns>
private static PointF GetPosition(Image imgBack, Image img, ImgPosition position, float?x = null, float?y = null)
{
PointF point = new PointF
{
X = 0,
Y = 0
};
switch (position)
{
case ImgPosition.居中:
point.X = imgBack.Width / 2 - img.Width / 2;
point.Y = imgBack.Height / 2 - img.Height / 2;
break;
case ImgPosition.左上角:
break;
case ImgPosition.右上角:
point.X = imgBack.Width - img.Width;
break;
case ImgPosition.右下角:
point.X = imgBack.Width - img.Width;
point.Y = imgBack.Height - img.Height;
break;
case ImgPosition.左下角:
point.Y = imgBack.Height - img.Height;
break;
case ImgPosition.自定义:
point.X = (float)x;
point.Y = (float)y;
break;
}
return(point);
}
