private Image CropImage(Image img, CropImageViewModel cropArgs) {
var scale = 1 / cropArgs.Zoom;
var cropImg = new Bitmap((int)(cropArgs.Width * scale), (int)(cropArgs.Height * scale));
var radius = scale * cropArgs.CornerRadius;
using (var g = Graphics.FromImage(cropImg)) {
g.Clear(Color.Transparent);
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBilinear;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.CompositingQuality = CompositingQuality.HighQuality;
g.DrawImage(img,
new RectangleF(0, 0, cropImg.Width, cropImg.Height),
new RectangleF((cropArgs.OffsetX * scale), (cropArgs.OffsetY * scale), cropImg.Width, cropImg.Height),
GraphicsUnit.Pixel);
}
switch (cropArgs.Shape) {
case CropImageShape.Rectangle:
if (cropArgs.CornerRadius > 0)
return RoundCorners(cropImg, radius);
break;
case CropImageShape.Circle:
CropEllipse(cropArgs, cropImg);
break;
case CropImageShape.Polygon:
return CropPolygonImage(cropImg, cropArgs, cropImg.Width, cropImg.Height);
}
return cropImg;
}
public Image CropResizeImage(Image img, CropImageViewModel cropArgs) {
if (cropArgs.Proportion) {
img = ZoomPicture(img, new Size((Int32)cropArgs.Width, (Int32)cropArgs.Height));
} else {
img = CropImage(img, cropArgs);
img = ResizeImage(img, cropArgs);
}
return img;
}
private void CropEllipse(CropImageViewModel cropArgs, Bitmap cropImg) {
var rect = new Rectangle(0, 0, cropImg.Width, cropImg.Height);
using (var brush = new TextureBrush(cropImg, rect)) {
using (var g = Graphics.FromImage(cropImg)) {
g.Clear(Color.Transparent);
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBilinear;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.CompositingQuality = CompositingQuality.HighQuality;
g.FillEllipse(brush, 0, 0, cropImg.Width, cropImg.Height);
}
}
}
public JsonResult UploadPost(CropImageViewModel cropImageModel) {
var file = Request.Files["MyFile"];
if (file != null) {
var mem = new MemoryStream();
var ext = Path.GetExtension(file.FileName).ToLower();
if (cropImageModel != null) {
using (var img = System.Drawing.Image.FromStream(file.InputStream)) {
using (var image = _imageHelper.CropResizeImage(img, cropImageModel)) {
image.Save(mem, img.RawFormat);
mem.Position = 0;
}
}
} else
file.InputStream.CopyTo(mem);
var resource = _resourceManager.SaveImage(mem, ext);
mem.Dispose();
return Json(new { resource.Name, resource.Url });
}
return Json(null);
}
private Image CropPolygonImage(Image img, CropImageViewModel cropArgs, int width, int height) {
int banjing = width / 2;
int poleX = width / 2;
int poleY = height / 2;
var point = new PointF[cropArgs.Polygons];
var cropImg = new Bitmap(width, height);
for (int i = 0; i < cropArgs.Polygons; i++) {
point[i].X = (float)(poleX + banjing * Math.Sin(i * 2 * Math.PI / cropArgs.Polygons));
point[i].Y = (float)(poleY - banjing * Math.Cos(i * 2 * Math.PI / cropArgs.Polygons));
}
using (Graphics g = Graphics.FromImage(cropImg)) {
g.Clear(Color.Transparent);
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBilinear;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.CompositingQuality = CompositingQuality.HighQuality;
using (var gp = new GraphicsPath()) {
gp.AddPolygon(point);
g.SetClip(gp);
g.DrawImage(img, 0, 0);
}
img.Dispose();
}
return cropImg;
}
private Image ResizeImage(Image img, CropImageViewModel cropArgs) {
var resizeImg = new Bitmap((int)(cropArgs.Width * cropArgs.Scale), (int)(cropArgs.Height * cropArgs.Scale));
using (var g = Graphics.FromImage(resizeImg)) {
g.Clear(Color.Transparent);
g.SmoothingMode = SmoothingMode.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBilinear;
g.PixelOffsetMode = PixelOffsetMode.HighQuality;
g.CompositingQuality = CompositingQuality.HighQuality;
g.DrawImage(img, new Rectangle(0, 0, resizeImg.Width, resizeImg.Height));
}
return resizeImg;
}