'IImageProcessingContext'不包含 'ApplyScalingWaterMark' ImageSharp 的定义

Question

我正在运行最新版本，并收到前面的错误。

严重性代码描述项目文件行抑制状态错误CS1061"IImageProcessingContext"不包含的定义"ApplyScalingWaterMark"且没有可访问的扩展方法"ApplyScalingWaterMark"接受类型为的第一个参数未能找到"IImageProcessingContext"(是否缺少使用指令还是程序集引用？(GitHubFuncsC： \Sibeesh\Github\GitHubFuncs\GetLatestPosts.cs 39活动

当我运行下面的代码时。

using(var img = Image.Load("canvas.jpg")) {
Font font = SystemFonts.CreateFont("Arial", 10);
using
var img2 = img.Clone(ctx => ctx.ApplyScalingWaterMark(font, feedItem.Summary.Text, Color.HotPink, 5, true));
img2.Save("images/wrapped.png");
}

已添加using语句。

using SixLabors.Fonts;
using SixLabors.ImageSharp.Drawing;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Processing;

我在这里错过了什么？这是最新版本的问题吗？

Answer 1

最后，我让它工作起来了。我只需要添加一些扩展方法。

using SixLabors.Fonts;
using SixLabors.ImageSharp;
using SixLabors.ImageSharp.Drawing.Processing;
using SixLabors.ImageSharp.Processing;
using System;
namespace GitHubFuncs.ExtensionMethods {
public static class ImageSharpExtensions {
public static IImageProcessingContext ApplyScalingWaterMark(this IImageProcessingContext processingContext,
Font font,
string text,
Color color,
float padding,
bool wordwrap) {
if (wordwrap) {
return processingContext.ApplyScalingWaterMarkWordWrap(font, text, color, padding);
} else {
return processingContext.ApplyScalingWaterMarkSimple(font, text, color, padding);
}
}
private static IImageProcessingContext ApplyScalingWaterMarkSimple(this IImageProcessingContext processingContext,
Font font,
string text,
Color color,
float padding) {
Size imgSize = processingContext.GetCurrentSize();
float targetWidth = imgSize.Width - (padding * 2);
float targetHeight = imgSize.Height - (padding * 2);
// measure the text size
FontRectangle size = TextMeasurer.Measure(text, new RendererOptions(font));
//find out how much we need to scale the text to fill the space (up or down)
float scalingFactor = Math.Min(imgSize.Width / size.Width, imgSize.Height / size.Height);
//create a new font
Font scaledFont = new Font(font, scalingFactor * font.Size);
var center = new PointF(imgSize.Width / 2, imgSize.Height / 2);
var textGraphicOptions = new TextGraphicsOptions() {
TextOptions = {
HorizontalAlignment = HorizontalAlignment.Center,
VerticalAlignment = VerticalAlignment.Center
}
};
return processingContext.DrawText(textGraphicOptions, text, scaledFont, color, center);
}
private static IImageProcessingContext ApplyScalingWaterMarkWordWrap(this IImageProcessingContext processingContext,
Font font,
string text,
Color color,
float padding) {
Size imgSize = processingContext.GetCurrentSize();
float targetWidth = imgSize.Width - (padding * 2);
float targetHeight = imgSize.Height - (padding * 2);
float targetMinHeight = imgSize.Height - (padding * 3); // must be with in a margin width of the target height
// now we are working i 2 dimensions at once and can't just scale because it will cause the text to
// reflow we need to just try multiple times
var scaledFont = font;
FontRectangle s = new FontRectangle(0, 0, float.MaxValue, float.MaxValue);
float scaleFactor = (scaledFont.Size / 2); // every time we change direction we half this size
int trapCount = (int) scaledFont.Size * 2;
if (trapCount < 10) {
trapCount = 10;
}
bool isTooSmall = false;
while ((s.Height > targetHeight || s.Height < targetMinHeight) && trapCount > 0) {
if (s.Height > targetHeight) {
if (isTooSmall) {
scaleFactor = scaleFactor / 2;
}
scaledFont = new Font(scaledFont, scaledFont.Size - scaleFactor);
isTooSmall = false;
}
if (s.Height < targetMinHeight) {
if (!isTooSmall) {
scaleFactor = scaleFactor / 2;
}
scaledFont = new Font(scaledFont, scaledFont.Size + scaleFactor);
isTooSmall = true;
}
trapCount--;
s = TextMeasurer.Measure(text, new RendererOptions(scaledFont) {
WrappingWidth = targetWidth
});
}
var center = new PointF(padding, imgSize.Height / 2);
var textGraphicOptions = new TextGraphicsOptions() {
TextOptions = {
HorizontalAlignment = HorizontalAlignment.Left,
VerticalAlignment = VerticalAlignment.Center,
WrapTextWidth = targetWidth
}
};
return processingContext.DrawText(textGraphicOptions, text, scaledFont, color, center);
}
}
}

最后，我可以像前面一样使用这个方法。

private static string WriteOnImage(SyndicationItem feedItem) {
using var img = Image.Load("images/canvas.jpg");
var font = SystemFonts.CreateFont("Arial", 20);
using var img2 = img.Clone(ctx => ctx.ApplyScalingWaterMark(font, feedItem.Summary.Text, Color.White, 5, true));
return img2.ToBase64String(PngFormat.Instance);
}