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如何绘制不断变化的图形

gdi+ graphics c#
  •  2
  • Margus  · 技术社区  · 14 年前

    以前没有这样做过( >除了在Java 中,看看如何< HRFF=“http://StaskOpf.com /用户/ 2959 /史提夫麦克劳德”> Steve McLeod < /a>修复它),所以显然我很讨厌它。这里,当前鼠标位置周围的64个像素在窗体上绘制得稍大一些。问题是,这是“某种程度上”的慢,我不知道从哪里开始修复。

    除此之外,我还制作了一个计时器线程,当它完成时,它会不断调用更新图形和一点类似fps的文本,以显示绘制东西的速度。

    图像示例:(图像来自Microsoft VS2010中“IntelliTrace”中的字母“A”)。

    源示例: 

    使用系统;
使用system.collections.generic;
使用System.ComponentModel;
使用系统数据;
使用系统、图纸;
使用system.linq;
使用system.text;
使用system.windows.forms;
使用System.Runtime.InteropServices;

命名空间缩放
{
公共分部类Form1:Form
{
静态类dllref
{
[dllimport(“user32.dll”)]
[返回:marshalas(unmanagedType.bool)]
静态外部bool getcursorpos(输出点lppoint);

[dllimport(“user32.dll”)]
静态外部intptr getdc(intptr hwnd);

[dllimport(“user32.dll”)]
静态外部int32 releasedc(intptr hwnd,intptr hdc);

[dllimport(“gdi32.dll”)]
静态外部uint getpixel(intptr hdc,int nxpos,int nypos);

//来自http://www.pinvoke.net/default.aspx/gdi32/getpixel.html
静态公共系统.drawing.color getPixelColor(int x,int y){
intptr hdc=getdc(intptr.zero);
uint pixel=获取像素(hdc,x,y);
释放直流电(Intpr.Zero,HDC);
color color=color.fromargb((int)(像素&0x000000FF),
(int)(像素&0x0000 ff00)>>8,
(int)(像素&0x00ff0000)>>16);
返回颜色;
}
静态公共系统.drawing.point getmouseposition()。{
点P=新点();
GETCURSORPOS(输出P);
返回P;
}
}

公共窗体1()。{
初始化组件();
this.size=新尺寸(400400);
this.text=“图像缩放”;
this.location=新点(640,0);
this.image=新位图(320、320);
this.timeRef=datetime.now;
this.backcolor=color.white;
timer t=新timer();
t.间隔=25;
t.tick+=新事件处理程序(计时器\u tick);
启动();
}

公共无效计时器勾号(对象发送方、事件参数搜索){
this.form1_paint(this,new paintEventArgs(this.creategraphics(),new rectangle(0,0,this.width,this.height));
}

private bool isdone=真;
private int iter=0;
私有位图图像;
私有日期时间TimeRef;
private void form1_paint(对象发送器,paintEventArgs e){
如果(ISDON){
ISDON=假;
INT步骤=40;
点P=dllRef.getMousePosition();
pen mypen=新笔(color.gray,1);
solidbrush mybrush=空;
位图图像2=新位图(320、340);

graphics gc=graphics.fromimage(图像2);

对于(int x=0;x<8;x++){
对于(int y=0;y<8;y++){
myBrush=新solidBrush(dllRef.getPixelColor(p.x-4+x,p.y-4+y));
gc.fillEllipse(myBrush,x*步骤,y*步骤,步骤-3,步骤-3);
gc.drawEllipse(mypen,x*步骤,y*步骤,步骤-3,步骤-3);
}
}
StringBuilder sb=new StringBuilder();
追加(ITER)
.append(“帧输入”)。
.append(string.format(“0:0.”),((datetime.now this.timeRef.total毫秒)/1000))
追加(“S”);
gc.fillRectangle(新solidBrush(this.backcolor)、新矩形(0、320、320、40));
gc.drawstring(sb.toString(),新字体(“Arial”,12),新solidBrush(color.black),10,320);
气相色谱法;
ISDON=真;
ITER ++;
图像=IIGE2;
}
e.图形。DrawImage(图像,35F,15F);
}
}
}
< /代码> 


    在我做了一些修改之后,这个速度快了约98%:
    


    使用系统;
使用system.collections.generic;
使用System.ComponentModel;
使用系统数据;
使用系统、图纸;
使用system.linq;
使用system.text;
使用system.windows.forms;
使用System.Runtime.InteropServices;


命名空间缩放
{
公共分部类Form1:Form
{
静态类dllref
{
[dllimport(“user32.dll”)]
[返回:marshalas(unmanagedType.bool)]
静态外部bool getcursorpos(输出点lppoint);

[dllimport(“user32.dll”)]
静态外部intptr getdc(intptr hwnd);

[dllimport(“user32.dll”)]
静态外部int32 releasedc(intptr hwnd,intptr hdc);

[dllimport(“gdi32.dll”)]
静态外部uint getpixel(intptr hdc,int nxpos,int nypos);

//来自http://www.pinvoke.net/default.aspx/gdi32/getpixel.html
静态公共系统.drawing.color getPixelColor(int x,int y){
intptr hdc=getdc(intptr.zero);
uint pixel=获取像素(hdc,x,y);
释放直流电(Intpr.Zero,HDC);
color color=color.fromargb((int)(像素&0x000000FF),
(int)(像素&0x0000 ff00)>>8,
(int)(像素&0x00ff0000)>>16);
返回颜色;
}
静态公共系统.drawing.point getmouseposition()。{
点P=新点();
GETCURSORPOS(输出P);
返回P;
}
}

公共窗体1()。{
初始化组件();
this.size=新尺寸(400400);
this.text=“图像缩放”;
this.location=新点(640,0);
this.image=新位图(320、340);
this.timeRef=datetime.now;
this.backcolor=color.white;
timer t=新timer();
t.间隔=25;
t.tick+=新事件处理程序(计时器\u tick);
启动();
}

公共无效计时器勾号(对象发送方、事件参数搜索){
this.form1_paint(this,new paintEventArgs(this.creategraphics(),new rectangle(0,0,this.width,this.height));
}

private bool isdone=真;
private int iter=0;
私有位图图像;
私有日期时间TimeRef;
private void form1_paint(对象发送器,paintEventArgs e){
如果(ISDON){
ISDON=假;
INT步骤=40;
点P=dllRef.getMousePosition();
solidbrush mybrush=空;
bitmap hc=新位图(8,8);

使用(pen mypen=新笔(color.gray,1))
使用(graphics gc=graphics.fromimage(image))
使用(graphics gf=graphics.fromimage(hc))
{
从屏幕复制(P.X-4,P.Y-4,0,0,新尺寸(8,8)
copyPixelOperation.sourceCopy);

对于(int x=0;x<8;x++)
{
对于(int y=0;y<8;y++)
{
myBrush=新solidBrush(hc.getPixel(x,y));
gc.fillEllipse(myBrush,x*步骤,y*步骤,步骤-3,步骤-3);
gc.drawEllipse(mypen,x*步骤,y*步骤,步骤-3,步骤-3);
}
}

double ts=(datetime.now-this.timeref).totalms)/1000;
StringBuilder sb=new StringBuilder();
sb.append(++iter).append(“frames in”).append(string.format(“0:0.”,ts)).append(“s.”);

gc.fillRectangle(新solidBrush(this.backcolor)、新矩形(0、320、320、40));
gc.drawstring(sb.toString(),新字体(“Arial”,12),新solidBrush(color.black),10,320);

}

ISDON=真;
}
e.图形。DrawImage(图像,35F,15F);
}
}
}
< /代码> <看看怎么样Steve McLeod修好了),所以很明显我很讨厌。这里,当前鼠标位置周围的64个像素在窗体上绘制得稍大一些。问题是,它是'某种'慢,我不知道从哪里开始修复。
    


    除此之外,我还做了一个计时器线程,当它完成时,它会不断调用更新图形和一些类似于fps的文本,以显示绘制东西的速度。
    


    图像示例:(图像来自Microsoft VS2010中“IntelliTrace”中的字母“A”)。
    


    alt text
    


    实例:
    


    using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace Zoom
{
    public partial class Form1 : Form
    {
        static class dllRef
        {
            [DllImport("user32.dll")]
            [return: MarshalAs(UnmanagedType.Bool)]
            static extern bool GetCursorPos(out Point lpPoint);

            [DllImport("user32.dll")]
            static extern IntPtr GetDC(IntPtr hwnd);

            [DllImport("user32.dll")]
            static extern Int32 ReleaseDC(IntPtr hwnd, IntPtr hdc);

            [DllImport("gdi32.dll")]
            static extern uint GetPixel(IntPtr hdc, int nXPos, int nYPos);

            // from http://www.pinvoke.net/default.aspx/gdi32/GetPixel.html
            static public System.Drawing.Color getPixelColor(int x, int y) {
                IntPtr hdc = GetDC(IntPtr.Zero);
                uint pixel = GetPixel(hdc, x, y);
                ReleaseDC(IntPtr.Zero, hdc);
                Color color = Color.FromArgb((int)(pixel & 0x000000FF),
                             (int)(pixel & 0x0000FF00) >> 8,
                             (int)(pixel & 0x00FF0000) >> 16);
                return color;
            }
            static public System.Drawing.Point getMousePosition() {
                Point p = new Point();
                GetCursorPos(out p); 
                return p;
            }
        }

        public Form1() {
            InitializeComponent();
            this.Size = new Size(400,400);
            this.Text="Image zoom";
            this.Location = new Point(640, 0);
            this.image = new Bitmap(320, 320);
            this.timeRef = DateTime.Now;
            this.BackColor = Color.White;
            Timer t = new Timer();
            t.Interval = 25;
            t.Tick += new EventHandler(Timer_Tick);
            t.Start();
        }

        public void Timer_Tick(object sender, EventArgs eArgs) {
            this.Form1_Paint(this, new PaintEventArgs(this.CreateGraphics(), new Rectangle(0, 0, this.Width, this.Height)));
        }

        private bool isdone = true;
        private int iter = 0;
        private Bitmap image;
        private DateTime timeRef;
        private void Form1_Paint(object sender, PaintEventArgs e) {
            if (isdone) {
                isdone = false;
                int step = 40;
                Point p = dllRef.getMousePosition();
                Pen myPen = new Pen(Color.Gray, 1);
                SolidBrush myBrush = null;
                Bitmap image2 = new Bitmap(320, 340);

                Graphics gc = Graphics.FromImage(image2);

                for (int x = 0; x < 8; x++) {
                    for (int y = 0; y < 8; y++) {
                        myBrush = new SolidBrush(dllRef.getPixelColor(p.X - 4 + x, p.Y - 4 + y));
                        gc.FillEllipse(myBrush, x * step, y * step, step - 3, step - 3);
                        gc.DrawEllipse(myPen, x * step, y * step, step - 3, step - 3);
                    }
                }
                StringBuilder sb = new StringBuilder();
                sb.Append(iter)
                        .Append(" frames in ")
                        .Append(String.Format("{0:0.###}", ((DateTime.Now-this.timeRef).TotalMilliseconds)/1000))
                        .Append("s.");
                gc.FillRectangle(new SolidBrush(this.BackColor), new Rectangle( 0, 320, 320, 40));
                gc.DrawString(sb.ToString(),new Font("Arial", 12),new SolidBrush(Color.Black), 10, 320);
                gc.Dispose();
                isdone = true;
                iter++;
                image = image2;
            }
            e.Graphics.DrawImage(image, 35f, 15f);
        }
    }
}

    


    在我做了一些修改之后,这一个速度提高了约98%:
    


    using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;


namespace Zoom
{
    public partial class Form1 : Form
    {
        static class dllRef
        {
            [DllImport("user32.dll")]
            [return: MarshalAs(UnmanagedType.Bool)]
            static extern bool GetCursorPos(out Point lpPoint);

            [DllImport("user32.dll")]
            static extern IntPtr GetDC(IntPtr hwnd);

            [DllImport("user32.dll")]
            static extern Int32 ReleaseDC(IntPtr hwnd, IntPtr hdc);

            [DllImport("gdi32.dll")]
            static extern uint GetPixel(IntPtr hdc, int nXPos, int nYPos);

            // from http://www.pinvoke.net/default.aspx/gdi32/GetPixel.html
            static public System.Drawing.Color getPixelColor(int x, int y) {
                IntPtr hdc = GetDC(IntPtr.Zero);
                uint pixel = GetPixel(hdc, x, y);
                ReleaseDC(IntPtr.Zero, hdc);
                Color color = Color.FromArgb((int)(pixel & 0x000000FF),
                             (int)(pixel & 0x0000FF00) >> 8,
                             (int)(pixel & 0x00FF0000) >> 16);
                return color;
            }
            static public System.Drawing.Point getMousePosition() {
                Point p = new Point();
                GetCursorPos(out p); 
                return p;
            }
        }

        public Form1() {
            InitializeComponent();
            this.Size = new Size(400,400);
            this.Text="Image zoom";
            this.Location = new Point(640, 0);
            this.image = new Bitmap(320, 340);
            this.timeRef = DateTime.Now;
            this.BackColor = Color.White;
            Timer t = new Timer();
            t.Interval = 25;
            t.Tick += new EventHandler(Timer_Tick);
            t.Start();
        }

        public void Timer_Tick(object sender, EventArgs eArgs) {
            this.Form1_Paint(this, new PaintEventArgs(this.CreateGraphics(), new Rectangle(0, 0, this.Width, this.Height)));
        }

        private bool isdone = true;
        private int iter = 0;
        private Bitmap image;
        private DateTime timeRef;
        private void Form1_Paint(object sender, PaintEventArgs e) {
            if (isdone) {
                isdone = false;
                int step = 40;
                Point p = dllRef.getMousePosition();
                SolidBrush myBrush = null;
                Bitmap hc = new Bitmap(8, 8);

                using (Pen myPen = new Pen(Color.Gray, 1))
                using (Graphics gc = Graphics.FromImage(image))
                using (Graphics gf = Graphics.FromImage(hc))
                {
                    gf.CopyFromScreen(p.X - 4, p.Y - 4, 0, 0, new Size(8, 8),
                            CopyPixelOperation.SourceCopy);

                    for (int x = 0; x < 8; x++)
                    {
                        for (int y = 0; y < 8; y++)
                        {
                            myBrush = new SolidBrush(hc.GetPixel(x, y));
                            gc.FillEllipse(myBrush, x * step, y * step, step - 3, step - 3);
                            gc.DrawEllipse(myPen, x * step, y * step, step - 3, step - 3);
                        }
                    }

                    double ts = ((DateTime.Now - this.timeRef).TotalMilliseconds) / 1000;
                    StringBuilder sb = new StringBuilder();
                    sb.Append(++iter).Append(" frames in ").Append(String.Format("{0:0.###}", ts)).Append("s.");

                    gc.FillRectangle(new SolidBrush(this.BackColor), new Rectangle(0, 320, 320, 40));
                    gc.DrawString(sb.ToString(), new Font("Arial", 12), new SolidBrush(Color.Black), 10, 320);

                }

                isdone = true;
            }
            e.Graphics.DrawImage(image, 35f, 15f);
        }
    }
}
    1 回复  |  直到 14 年前
        1
  •  4
  •   Community CDub    7 年前

    GetDC ReleaseDC 

    for each pixel
  GetDC
  Read Pixel
  ReleaseDC


    GetDC
for each pixel
  read pixel and store value
ReleaseDC

    GetPixel Capture the Screen into a Bitmap

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