概述

本篇文章将介绍C#在PPT幻灯片中操作形状（shape）的方法。这里主要涉及常规形状，如带箭头的线条，矩形、圆形、三角形、多边形、不规则形状等。下面的示例中，可以通过绘制形状，并设置相应格式等。示例包含以下要点：

绘制形状
用图片填充形状
在形状中添加文字
设置形状单色、渐变色填充
设置形状阴影效果、光边效果
组合多个形状为一个
将形状保存为图片

工具

Spire.Presentation for .NET

下载安装后，注意在程序中添加引用Spire.Presentation.dll到程序，dll文件可在安装路径下的Bin文件夹中获取。

示例代码（供参考）

【示例1】绘制形状

using Spire.Presentation;
using Spire.Presentation.Drawing;
using System.Collections;
using System.Drawing;

namespace DrawShape_PPT
{
    class Program
    {
        static void Main(string[] args)
        {
            //新建一个幻灯片文档，并指定幻灯片大小
            Presentation ppt = new Presentation();
            ppt.SlideSize.Type = SlideSizeType.Screen16x9;

            //获取第一张幻灯片
            ISlide slide = ppt.Slides[0];

            //添加一个云朵形状，并填充渐变颜色
            IAutoShape shape1 = slide.Shapes.AppendShape(ShapeType.CalloutCloud, new RectangleF(160, 50, 200, 80));
            shape1.Fill.FillType = FillFormatType.Gradient;
            shape1.Fill.Gradient.GradientStops.Append(0, Color.Blue);
            shape1.Fill.Gradient.GradientStops.Append(1, Color.Azure);
            shape1.Line.FillType = FillFormatType.None;

            //在形状中绘制文本，并设置字体、字号、字体颜色等
            shape1.AppendTextFrame("HOW??");
            TextRange textRange = (shape1 as IAutoShape).TextFrame.TextRange;
            textRange.FontHeight = 13;
            textRange.LatinFont = new TextFont("Arial");
            textRange.Fill.FillType = FillFormatType.Solid;
            textRange.Fill.SolidColor.Color = Color.White;

            //添加一个椭圆，并用图片填充形状
            IAutoShape shape2 = slide.Shapes.AppendShape(ShapeType.Ellipse, new RectangleF(50, 130, 150, 250));
            string picPath = "sk.png"; 
            shape2.Fill.FillType = FillFormatType.Picture;
            shape2.Fill.PictureFill.Picture.Url = picPath;
            shape2.Fill.PictureFill.FillType = PictureFillType.Stretch;
            shape2.Line.FillType = FillFormatType.None;

            //添加一个三角形,填充颜色并设置形状边框样式
            IAutoShape shape3 = slide.Shapes.AppendShape(ShapeType.Triangle, new RectangleF(480, 180, 100, 130));
            shape3.Fill.FillType = FillFormatType.Solid;
            shape3.Fill.SolidColor.Color = Color.Wheat;
            shape3.Line.Width = 3;
            shape3.Line.DashStyle = LineDashStyleType.Dash;
            shape3.ShapeStyle.LineColor.Color = Color.Red;

            //设置形状阴影效果
            PresetShadow presetShadow = new PresetShadow();
            presetShadow.Preset = PresetShadowValue.BackRightPerspective;
            presetShadow.ColorFormat.Color = Color.LightGray;
            shape3.EffectDag.PresetShadowEffect = presetShadow;
         
            //添加一个带箭头的直线
            IAutoShape shape4 = slide.Shapes.AppendShape(ShapeType.Line, new RectangleF(660, 200, 100, 100));
            shape4.ShapeStyle.LineColor.Color = Color.Red;
            shape4.Line.LineEndType = LineEndType.StealthArrow;
            shape4.Rotation = -90;//设置形状旋转角度

            //添加一个圆形
            IAutoShape shape5 = slide.Shapes.AppendShape(ShapeType.Ellipse, new RectangleF(289, 166, 120, 120));
            shape5.Fill.FillType = FillFormatType.Solid;
            shape5.Fill.SolidColor.Color = Color.White;
            shape5.Line.FillType = FillFormatType.Solid;
            shape5.Line.SolidFillColor.Color = Color.Red;

            //添加一个五角星形状
            IAutoShape shape6 = slide.Shapes.AppendShape(ShapeType.FivePointedStar, new RectangleF(300, 170, 100, 100));
            shape6.Fill.FillType = FillFormatType.Solid;
            shape6.Fill.SolidColor.Color = Color.Orange;
            shape6.Line.FillType = FillFormatType.None;
            //设置五角星形状的光边效果
            GlowEffect glow = new GlowEffect();
            glow.ColorFormat.Color = Color.Yellow;
            glow.Radius = 7.0;
            shape6.EffectDag.GlowEffect = glow;
            
            //将shape5和shape6两个形状组合
            ArrayList list = new ArrayList();
            list.Add(shape5);
            list.Add(shape6);
            ppt.Slides[0].GroupShapes(list);

            //保存文档
            ppt.SaveToFile("result.pptx", FileFormat.Pptx2010);
            System.Diagnostics.Process.Start("result.pptx");
        }
    }
}

形状添加效果：

【示例2】将形状保存为图片

using Spire.Presentation;
using System;
using System.Drawing;

namespace SaveShapesAsImgs_PPT
{
    class Program
    {
        static void Main(string[] args)
        {
            //实例化Presentation类的对象，并加载测试文档
            Presentation ppt = new Presentation();
            ppt.LoadFromFile("test.pptx");

            //遍历第一张幻灯片中的所有图形
            for (int i = 0; i < ppt.Slides[0].Shapes.Count; i++)
            {
                //获取幻灯片中的图形，并保存为.png格式的图片
                Image image = ppt.Slides[0].Shapes.SaveAsImage(i);
                image.Save(String.Format("Picture-{0}.png", i), System.Drawing.Imaging.ImageFormat.Png);
            }

        }
    }
}