【Code Art / C#】随机贝塞尔曲线效果测试

来源：互联网发布：mac brave 编辑：程序博客网时间：2024/05/16 02:44
贝塞尔曲线是通过几个控制点来绘制曲线的一种方法。通过若干个贝塞尔曲线随机组合，然后随机移动每个控制点，会实现怎样的效果呢？
用这样简单粗暴的思路，写了以下绘制代码。
然后将画完的一帧做模糊处理，不擦除画布继续画一帧，然后用Timer循环绘制，便实现了如图所示的效果。
以下为随机绘制一帧的代码，如需要动画效果和如图所示的效果请参照以上思路自行实现。
using System;using System.Collections.Generic;using System.Text;using System.Drawing;using System.Drawing.Drawing2D;using System.Drawing.Imaging;using System.Runtime.InteropServices;using sf = RandBezier.SystemFramework;namespace RandBezier{    /// <summary>    /// 贝塞尔节点结构    /// </summary>    public class RandPoint    {        public RandPoint()        {            this.X = sf.Rand.Next(0, sf.Win_Width);            this.Y = sf.Rand.Next(0, sf.Win_Height);            this.dx = sf.Rand.Next(-100, 100) * 1f / 100;            this.dy = sf.Rand.Next(-100, 100) * 1f / 100;            this.offset_dx = sf.Rand.Next(-100, 100) * 1f / 1000;            this.offset_dy = sf.Rand.Next(-100, 100) * 1f / 1000;        }        public float X { get; set; }        public float Y { get; set; }        public float dx = 0f;        public float dy = 0f;        private float offset_dx = 0f;        private float offset_dy = 0f;        private int count = 0;        /// <summary>        /// 移动处理        /// </summary>        public void Do()        {            this.X += this.dx;            if (this.X < 0 || this.X > sf.Win_Width)            {                this.dx = -this.dx;                this.offset_dx = -this.offset_dx;            }            this.Y += this.dy;            if (this.Y < 0  || this.Y > sf.Win_Height)            {                this.dy = -this.dy;                this.offset_dy = -this.offset_dy;            }            this.dx += this.offset_dx;            if (Math.Abs(this.dx) > 10)            {                this.offset_dx = -this.offset_dx;            }            this.dy += this.offset_dy;            if (Math.Abs(this.dy) > 10)            {                this.offset_dy = -this.offset_dy;            }            if (this.count > 150)            {                this.count = 0;                this.offset_dx = sf.Rand.Next(-100, 100) * 1f / 1000;                this.offset_dy = sf.Rand.Next(-100, 100) * 1f / 1000;            }            this.count++;        }    }    /// <summary>    /// 颜色结构    /// </summary>    public class RandColor    {        private int min = 180;        private int max = 255;        public RandColor()        {            this.R = sf.Rand.Next(min, max);            this.G = sf.Rand.Next(min, max);            this.B = sf.Rand.Next(min, max);            this.offset_r = sf.Rand.Next(-5, 5);            this.offset_g = sf.Rand.Next(-5, 5);            this.offset_b = sf.Rand.Next(-5, 5);        }        public int R { get; set; }        public int G { get; set; }        public int B { get; set; }        private int offset_r = 0;        private int offset_g = 0;        private int offset_b = 0;        private int count = 0;        public void Do()        {            this.R += this.offset_r;            if (this.R < min)            {                this.R = min;                this.offset_r = -this.offset_r;            }            if (this.R > max)            {                this.R = max;                this.offset_r = -this.offset_r;            }            this.G += this.offset_g;            if (this.G < min)            {                this.G = min;                this.offset_g = -this.offset_g;            }            if (this.G > max)             {                this.G = max;                this.offset_g = -this.offset_g;            }            this.B += this.offset_b;            if (this.B < min)            {                this.B = min;                this.offset_b = -this.offset_b;            }            if (this.B > max)             {                this.B = max;                this.offset_b = -this.offset_b;            }            if (this.count > 100)            {                this.count = 0;                this.offset_r = sf.Rand.Next(-5, 5);                this.offset_g = sf.Rand.Next(-5, 5);                this.offset_b = sf.Rand.Next(-5, 5);            }            this.count++;        }        public Color GetColor()        {            return Color.FromArgb(this.R, this.G, this.B);        }    }    /// <summary>    /// 贝塞尔绘制器    /// </summary>    public class BezierDraw    {        private int Width = 800;        private int Height = 600;        private Graphics graphics = null;        private Bitmap bmp_temp = null;        private Bitmap bmp_back = null;        private List<RandPoint> pointList;        private List<PointF> pointDrawList;        private RandColor randColor;        /// <summary>        /// 构造函数        /// </summary>        /// <param name="width"></param>        /// <param name="height"></param>        /// <param name="g"></param>        public BezierDraw(int width,int height,Graphics g)        {            this.Width = width;            this.Height = height;            this.graphics = g;            this.bmp_temp = new Bitmap(width, height);            this.bmp_back = new Bitmap(width, height);            this.pointList = new List<RandPoint>();            this.randColor = new RandColor();            this.pointDrawList = new List<PointF>();            for (int i = 0; i < 100; i++)            {                pointList.Add(new RandPoint());            }        }        /// <summary>        /// 处理        /// </summary>        public void Do()        {            if (randColor != null)            {                randColor.Do();            }            if (pointDrawList != null && pointList != null)            {                pointDrawList.Clear();                foreach (RandPoint p in pointList)                {                    p.Do();                    pointDrawList.Add(new PointF(p.X,p.Y));                }            }        }        private int count = 0;        /// <summary>        /// 画出        /// </summary>        public void Draw()        {            if (graphics != null && bmp_temp != null && randColor != null)            {                // 背景图                Graphics gb = Graphics.FromImage(bmp_back);                gb.FillRectangle(new SolidBrush(Color.Black), 0, 0, Width, Height);                // 渐变                if (count > 25)                {                    bmp_temp = BitmapCtrlOpacity(bmp_temp, 0.89f);                    count = 0;                }                else                {                    bmp_temp = BitmapCtrlOpacity(bmp_temp, 0.95f);                }                count++;                bmp_temp = BimapZoom(bmp_temp);                // bmp_temp = GaussianBlur(bmp_temp);                // bmp_temp = BitmapOpacity(bmp_temp, 0.95f);                Graphics g = Graphics.FromImage(bmp_temp);                g.SmoothingMode = SmoothingMode.AntiAlias;                // 画曲线                Pen pen = new Pen(randColor.GetColor());                pen.Width = 1.5f;                g.DrawBeziers(pen, pointDrawList.ToArray());                                // 画到背景上                gb.DrawImage(bmp_temp, 0, 0);                // 画到设备上                graphics.DrawImage(bmp_back, 0, 0);            }        }        public static Bitmap BimapZoom(Bitmap srcBitmap)        {            Bitmap bmp = new Bitmap(srcBitmap.Width, srcBitmap.Height);            Bitmap bmp_temp = new Bitmap((int)(srcBitmap.Width / 2.5), (int)(srcBitmap.Height / 2.5));            Graphics g = Graphics.FromImage(bmp_temp);            g.SmoothingMode = SmoothingMode.HighSpeed;            g.DrawImage(srcBitmap, 0, 0, bmp_temp.Width, bmp_temp.Height);            g = Graphics.FromImage(bmp);            g.SmoothingMode = SmoothingMode.HighSpeed;            g.DrawImage(bmp_temp, 0, 0, srcBitmap.Width, srcBitmap.Height);            return bmp;        }        /// <summary>        /// 设置图像透明度        /// </summary>        /// <param name="srcImage">源图像</param>        /// <param name="opacity">透明度</param>        /// <returns>返回图像</returns>        public static Bitmap BitmapCtrlOpacity(Bitmap srcImage, float opacity)        {            float[][] nArray ={ new float[] {1, 0, 0, 0, 0},                 new float[] {0, 1, 0, 0, 0},                 new float[] {0, 0, 1, 0, 0},                 new float[] {0, 0, 0, opacity, 0},                 new float[] {0, 0, 0, 0, 1}                              };            ColorMatrix matrix = new ColorMatrix(nArray);            ImageAttributes attributes = new ImageAttributes();            attributes.SetColorMatrix(matrix, ColorMatrixFlag.Default, ColorAdjustType.Bitmap);            Bitmap resultImage = new Bitmap(srcImage.Width, srcImage.Height);            Graphics g = Graphics.FromImage(resultImage);            g.SmoothingMode = SmoothingMode.HighSpeed;            g.DrawImage(srcImage, new Rectangle(0, 0, srcImage.Width, srcImage.Height), 0, 0, srcImage.Width, srcImage.Height, GraphicsUnit.Pixel, attributes);            //DrawImage(srcImage, ref resultImage, new Rectangle(0, 0, srcImage.Width, srcImage.Height), new Point(0, 0));            g.Dispose();            return resultImage;        }    }}
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