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  • 利用C# + GDI plus模拟杂乱无章的现实场景

    本文给出了模拟竹叶、长叶草、杂乱石头、天上繁星等关键代码。使用.Net环境下C#语言,GDI+编写。

     

    模拟竹叶

    挺像的吧?谁说不像,我跟谁急!

    //关键参数

    int minCorners = 3;
    int maxCorners =4;

    PointF[] points = Stone.CreateStone(new Point((int)(perX * j), (int)(perY * i)), (int)(perX * 1.4f), (int)(perX * 0.009f), corners);

    模拟长叶青草

    说实话,这个不太像,太整齐了,应该再杂乱无章点。

    //关键参数

    int minCorners = 20;
    int maxCorners =38;

    PointF[] points = Stone.CreateStone(new Point((int)(perX * j), (int)(perY * i)), (int)(perX * 0.88f), (int)(perX * 0.01f), corners);
    g.FillClosedCurve(Brushes.Green, points, FillMode.Winding);

    模拟不规则的石块

    这个……怎么有的石块总是多出来那么一点点,好像石头上长了草似的?如果被你发现,说明你是个细心的人。反之,说你粗心也不为过,哈哈!

    //关键参数:

    int minCorners = 3;
    int maxCorners =4;

    PointF[] points = Stone.CreateStone(new Point((int)(perX * j), (int)(perY * i)), (int)(perX * 0.4f), (int)(perX * 0.396f), corners);
    g.FillClosedCurve(Brushes.Gray, points, FillMode.Winding);

    天上星,亮晶晶

    //关键参数:

    int minCorners = 3;
    int maxCorners =4;

    PointF[] points = Stone.CreateStone(new Point((int)(perX * j), (int)(perY * i)), (int)(perX * 0.18f), (int)(perX * 0.06f), corners);
    g.FillClosedCurve(Brushes.White, points, FillMode.Winding);

    //关键代码:

    using System;
    using System.Collections.Generic;
    using System.Drawing;
    using System.Text;

    namespace ZPXP.Com.Util
    {
        public static class Stone
        {
            public static PointF[] CreateStone(Point center, int outerRadius, int inner_radius, int arms)
            {
                int center_x = center.X;
                int center_y = center.Y;
                PointF[] points = new PointF[arms * 2];
                double offset = Math.PI / 2;
                double arc = 2 * Math.PI / arms;
                double half = arc / 2;
                double angle = 0;
                for (int i = 0; i < arms; i++)
                {
                    Random randomOuter = new Random((int)DateTime.Now.Ticks);
                    outerRadius = outerRadius - randomOuter.Next((int)(inner_radius * 0.06 * new Random().Next(-20,20) /30d), (int)(inner_radius * 0.08));
                    //outerRadius = outerRadius - randomOuter.Next((int)(inner_radius * 0.16 * new Random().Next(-20, 20) / 30d), (int)(inner_radius * 0.18));
                    Random randomInner = new Random(Guid.NewGuid().GetHashCode());
                    inner_radius = inner_radius + randomInner.Next((int)(inner_radius * 0.02 * new Random().Next(-100,100) /150d), (int)(inner_radius * 0.08));
                    //inner_radius = inner_radius + randomInner.Next((int)(inner_radius * 0.02 * new Random().Next(-100, 100) / 150d), (int)(inner_radius * 0.22));
                  
                    if (inner_radius > outerRadius)
                    {
                        int temp = outerRadius;
                        outerRadius = inner_radius;
                        inner_radius = temp;
                    }
                    double angleTemp = arc * randomInner.Next(-5, 5) / 10d;
                    angle = i * arc;
                    angle += angleTemp;
                    points[i * 2].X = (float)(center_x + Math.Cos(angle - offset) * outerRadius);
                    points[i * 2].Y = (float)(center_y + Math.Sin(angle - offset) * outerRadius);
                    points[i * 2 + 1].X = (float)(center_x + Math.Cos(angle + half - offset) * inner_radius);
                    points[i * 2 + 1].Y = (float)(center_y + Math.Sin(angle + half - offset) * inner_radius);
                }

                return points;
            }

        }
    }

    测试用代码:

    private void button3_Click(object sender, EventArgs e)
            {
                int width = 500;
                int height = 500;
                int x = 0;
                int y = 0;
                int numX = 10;
                int numY =10;
                float perX = width * 1f / numX;
                float perY = height * 1f / numY;
                Bitmap image = new Bitmap(width, height);
                Graphics g = Graphics.FromImage(image);

                g.CompositingQuality = CompositingQuality.HighQuality;
                g.SmoothingMode = SmoothingMode.HighQuality;
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;

                g.FillRectangle(Brushes.Black, new Rectangle(0,0, width, height));

                int minCorners = 3;
                int maxCorners =18;
                int lastCorners = minCorners;
                for (int i = 0; i < numX; i++)
                {
                    for (int j = 0; j < numY; j++)
                    {
                        long tick = DateTime.Now.Ticks;
                        Random random = new Random((int)(tick & 0xffffffff) | (int)(tick >> 32));
                        int corners = random.Next(minCorners, maxCorners);
                        if (Math.Abs(corners - lastCorners) < (maxCorners - minCorners) / 2) corners = RetrievRandomCorners(minCorners, maxCorners);
                        lastCorners = corners;
                        //PointF[] points = Stone.CreateStone(new Point((int)(perX * j), (int)(perY * i)), (int)(perX * 0.9f), (int)(perX * 0.8f), corners);
                        PointF[] points = Stone.CreateStone(new Point((int)(perX * j), (int)(perY * i)), (int)(perX * 0.18f), (int)(perX * 0.06f), corners);
                        g.FillClosedCurve(Brushes.White, points, FillMode.Winding);
                    }
                }

                picEncode.Image = image;

            }

            private int RetrievRandomCorners(int minCorners, int maxCorners)
            {
                return new Random(Guid.NewGuid().GetHashCode()).Next(minCorners, maxCorners);
            }

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  • 原文地址:https://www.cnblogs.com/shihao/p/2691445.html
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