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The author:(作者)qq
published in(发表于) 2014/7/11 9:16:29
c#中GDI+图形图像:GDI+中曲线的填充使用方法

c#中GDI+图形图像:GDI+中曲线的填充使用方法|实例

GDI+中曲线的填充

GDI+中,可以使用画笔来填充曲线,Graphics类填充曲线的方法有FillRectangle、FillEllipse、FillPie、FillPolygon、FillClosedCurve、FillPath和FillRegion。只要调用其中的任意一个方法,并使用一种指定的画笔类型作为其参数,就可以填充曲线。

示例

填充曲线

本示例中,当程序运行时,单击【填充曲线】按钮,在窗体中绘制一段图形路径,并使用指定画笔对该图形路径进行填充。示例运行结果如图1所示。



图1 填充曲线

Form1窗体中,单击【填充曲线】按钮,程序首先调用Graphics对象的FillPath方法,将要绘制的图形路径使用指定画笔填充好,然后再调用Graphics对象的DrawPath方法将图形路径绘制出来。【填充曲线】按钮的Click事件代码如下:

private void button1_Click(object sender, EventArgs e)

{

Graphics graphics = this.CreateGraphics();

SolidBrush mySolidBrush = new SolidBrush(Color.GreenYellow);

GraphicsPath myGraphicsPath = new GraphicsPath();

Pen myPen = new Pen(Color.Blue, 1);

Point[] myPoints = { new Point(15, 30), new Point(30, 40), new Point(50, 30) };

myGraphicsPath.AddArc(15, 20, 80, 50, 210, 120);

myGraphicsPath.StartFigure();

myGraphicsPath.AddCurve(myPoints);

myGraphicsPath.AddString("曲线填充", new FontFamily("华文行楷"), (int)FontStyle.Regular, 50, new PointF (20, 50), new StringFormat());

myGraphicsPath.AddPie(180, 20, 80, 50, 210, 120);

graphics.FillPath(mySolidBrush, myGraphicsPath);

graphics.DrawPath(myPen, myGraphicsPath);

}

完整程序代码如下:

★ ★★★★Form1.cs窗体代码文件完整程序代码★★★★★

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Text;

using System.Windows.Forms;

using System.Drawing.Drawing2D;

namespace _6_13

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

Graphics graphics = this.CreateGraphics();

SolidBrush mySolidBrush = new SolidBrush(Color.GreenYellow);

GraphicsPath myGraphicsPath = new GraphicsPath();

Pen myPen = new Pen(Color.Blue, 1);

Point[] myPoints = { new Point(15, 30), new Point(30, 40), new Point(50, 30) };

myGraphicsPath.AddArc(15, 20, 80, 50, 210, 120);

myGraphicsPath.StartFigure();

myGraphicsPath.AddCurve(myPoints);

myGraphicsPath.AddString("曲线填充", new FontFamily("华文行楷"), (int)FontStyle.Regular, 50, new PointF(20, 50), new StringFormat());

myGraphicsPath.AddPie(180, 20, 80, 50, 210, 120);

graphics.FillPath(mySolidBrush, myGraphicsPath);

graphics.DrawPath(myPen, myGraphicsPath);

}

}

}

★ ★★★★Form1.Designer.cs窗体设计文件完整程序代码★★★★★

namespace _6_13

{

partial class Form1

{

///



/// 必需的设计器变量。

///


private System.ComponentModel.IContainer components = null;

///

/// 清理所有正在使用的资源。

///


/// 如果应释放托管资源,为 true;否则为 false。

protected override void Dispose(bool disposing)

{

if (disposing && (components != null))

{

components.Dispose();

}

base.Dispose(disposing);

}

#region Windows 窗体设计器生成的代码

///

/// 设计器支持所需的方法 - 不要

/// 使用代码编辑器修改此方法的内容。

///


private void InitializeComponent()

{

this.button1 = new System.Windows.Forms.Button();

this.SuspendLayout();

//

// button1

//

this.button1.Location = new System.Drawing.Point(89, 104);

this.button1.Name = "button1";

this.button1.Size = new System.Drawing.Size(75, 23);

this.button1.TabIndex = 0;

this.button1.Text = "填充曲线";

this.button1.UseVisualStyleBackColor = true;

this.button1.Click += new System.EventHandler(this.button1_Click);

//

// Form1

//

this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 12F);

this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;

this.ClientSize = new System.Drawing.Size(252, 139);


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