Question

请先阅读标题。这是主要的想法问题是这个C＃代码的问题在哪里？（没有编译或运行错误但是没有工作）我跟踪它，发现甚至数组的位图都不是空的，并且该类正常工作;但是picturebox没有显示数组的值（位图）。

课程

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GRID
{
    class MasterSplitter
    {
        public BitmapArray_Block[] BMP2Array(Bitmap inp, Point BlockSize)
        {
        if (BlockSize.X > inp.Width || BlockSize.Y > inp.Height)
            BlockSize.X = BlockSize.Y = 100;

        int NW =0, NH = 0;
        int tx =1, ty = 1;
        if (((inp.Width%BlockSize.X) == 0) && ((inp.Height%BlockSize.Y) == 0))
        {
            NW = inp.Width;
            NH = inp.Height;
        }
        else
        {
            tx= inp.Width / BlockSize.X;
            NW = (BlockSize.X*tx) +BlockSize.X;
            ty = inp.Height / BlockSize.Y;
            NH = (BlockSize.Y * ty) + BlockSize.Y; 
        }

        //Operations for making an exact bitmap size
        Bitmap Temp = new Bitmap(NW, NH);
        Graphics g = Graphics.FromImage(Temp);
        g.DrawImage(inp, 0, 0, new Rectangle(0,0,Temp.Width, Temp.Height), GraphicsUnit.Pixel);
        g.Dispose(); //Cleaning up; Temp now has the exact bitmap size of what input BMP should has for devision.

        BitmapArray_Block[] T = new BitmapArray_Block[(tx * ty) + 1]; //Array for Bitmap MatriX

        int Xpos = 0, Ypos;
        int counter =0;
        for (int i=0; i<tx; i++)
        {
            Ypos = 0;
            for (int j=0;j<ty;j++)
            {
                BitmapArray_Block t = new BitmapArray_Block();
                t.start_location = new Point(Xpos,Ypos);
                t.BMP = new Bitmap(BlockSize.X,BlockSize.Y);
                Graphics gt = Graphics.FromImage(t.BMP);
                gt.DrawImage(Temp, Xpos, Ypos, new Rectangle(0, 0, t.BMP.Width, t.BMP.Height), GraphicsUnit.Pixel);
                gt.Dispose();
                T[counter] = t;

                Ypos += BlockSize.Y;
                counter+=1;
            }
            Xpos += BlockSize.X;
        }

        return T;
    }



    public class BitmapArray_Block
    {
        public Point start_location;

        public Bitmap BMP;


    }
}

显示结果的代码：

private void button1_Click(object sender, EventArgs e)
{
    MasterSplitter M = new MasterSplitter();
    BitmapArray_Block[] T =M.BMP2Array(new Bitmap(pictureBox1.Image),new Point(100,100));
    pictureBox1.Image = T[1].BMP;
}

Answer 1

你得到了DrawImage错误的论点。检查参数描述。开头的x和y是绘制图像的坐标，与其他一些重载不同，矩形指定<的部分<将绘制的em>原始图像。

这意味着您当前的代码始终采用源图像的左上角，并且在处理（0,0）处的第一个块之后，您尝试绘制的部分将被简单地绘制在可用帧之外。如果您在T[0].BMP上进行过测试，它实际上会有效，但从索引1开始，所有图像都将为空。

正确的代码应为：

// "using" will automatically dispose the resource after use, even in case of exceptions.
using(Graphics gt = Graphics.FromImage(t.BMP))
    gt.DrawImage(Temp, 0, 0, new Rectangle(Xpos, Ypos, BlockSize.X, BlockSize.Y), GraphicsUnit.Pixel);

将位图拆分为位图数组

1 个答案: