visual studio 2008 里的选择问题

Question

有没有朋友知道，如何让图像出现在 picturebox上点击鼠标的位置

Answer 1

        Bitmap bt = new Bitmap(@"c:\1.jpg");
        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            Graphics g = pictureBox1.CreateGraphics();
            g.DrawImage(bt, e.Location);
            g.Dispose();        }

Answer 2

但是~~！ private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            Color color;
            Graphics paper = pictureBoxshow.CreateGraphics();            if (radioButtonCircle.Checked)
            {
                r = radioButtonCircle;
                string circle = radioButtonCircle.Text;
                if (radioButtonRed.Checked)
                {
                    color = Color.Red;
                }
                else if (radioButtonGreen.Checked)
                {
                    color = Color.Green;
                }
                else
                {
                    color = Color.Blue;
                }
                if (radioButtonother.Checked)
                {                    if (colorDialog1.ShowDialog() == DialogResult.OK)
                    {
                        color = colorDialog1.Color;
                    }                }
            }
            else if (radioButtonsquare.Checked)
            {
                r = radioButtonsquare;
                string square = radioButtonsquare.Text;
                if (radioButtonRed.Checked)
                {
                    color = Color.Red;
                }
                else if (radioButtonGreen.Checked)
                {
                    color = Color.Green;
                }
                else
                {
                    color = Color.Blue;
                }
                if (radioButtonother.Checked)
                {
                    if (colorDialog1.ShowDialog() == DialogResult.OK)
                    {
                        color = colorDialog1.Color;
                    }
                }            }
            else
            {
                r = radioButtontriangle;
                string triangle = radioButtontriangle.Text;
                if (radioButtonRed.Checked)
                {
                    color = Color.Red;                }
                else if (radioButtonGreen.Checked)
                {
                    color = Color.Green;
                }
                else
                {
                    color = Color.Blue;
                }
                if (radioButtonother.Checked)
                {
                    if (colorDialog1.ShowDialog() == DialogResult.OK)
                    {
                        color = colorDialog1.Color;
                    }                }
                paper.Dispose();
                int a = Convert.ToInt32(paper.DpiX);
                int b = Convert.ToInt32(paper.DpiY);
                Shape shapeselect = new Shape(a, b, trackBarsize.Value, trackBarsize.Value, color);
                shapeselect.Draw(paper, r.Text);仍然不可实现阿？？为什么呢？？

Answer 3

这个不使用mouseclick吗？？？mouseclick 和mousedown怎么区别呢？？？

Answer 4

private void pictureBox1_Click(object sender, EventArgs e)
private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
MouseEventArgs e中包含坐标信息。

Answer 5

也就是说，我还需要加一个rivate void pictureBox1_Click(object sender, EventArgs e) ???
把int a = Convert.ToInt32(paper.DpiX);
                int b = Convert.ToInt32(paper.DpiY)
换成了 int a = Convert.ToInt32(e.X);
                int b = Convert.ToInt32(e.Y );
为什么还不行呢？？？（太谢谢你了）

Answer 6

朋友们帮帮忙吧，我明天要把project呈上的5555555555555555

Answer 7

                paper.Dispose(); //这行应该在后面吧？
                int a = Convert.ToInt32(paper.DpiX);
                int b = Convert.ToInt32(paper.DpiY);
                Shape shapeselect = new Shape(a, b, trackBarsize.Value, trackBarsize.Value, color);
                shapeselect.Draw(paper, r.Text);//shapeselect没有显示吧

Answer 8

--也就是说，我还需要加一个rivate void pictureBox1_Click(object sender, EventArgs e) ??? 
private void pictureBox1_Click(object sender, EventArgs e)这行不需要。

Answer 9

 private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            Color color;
            Graphics paper = pictureBoxshow.CreateGraphics();            if (radioButtonCircle.Checked)
            {
                r = radioButtonCircle;
                string circle = radioButtonCircle.Text;
                if (radioButtonRed.Checked)
                {
                    color = Color.Red;
                }
                else if (radioButtonGreen.Checked)
                {
                    color = Color.Green;
                }
                else
                {
                    color = Color.Blue;
                }
                if (radioButtonother.Checked)
                {                    if (colorDialog1.ShowDialog() == DialogResult.OK)
                    {
                        color = colorDialog1.Color;
                    }                }
            }
            else if (radioButtonsquare.Checked)
            {
                r = radioButtonsquare;
                string square = radioButtonsquare.Text;
                if (radioButtonRed.Checked)
                {
                    color = Color.Red;
                }
                else if (radioButtonGreen.Checked)
                {
                    color = Color.Green;
                }
                else
                {
                    color = Color.Blue;
                }
                if (radioButtonother.Checked)
                {
                    if (colorDialog1.ShowDialog() == DialogResult.OK)
                    {
                        color = colorDialog1.Color;
                    }
                }            }
            else
            {
                r = radioButtontriangle;
                string triangle = radioButtontriangle.Text;
                if (radioButtonRed.Checked)
                {
                    color = Color.Red;                }
                else if (radioButtonGreen.Checked)
                {
                    color = Color.Green;
                }
                else
                {
                    color = Color.Blue;
                }
                if (radioButtonother.Checked)
                {
                    if (colorDialog1.ShowDialog() == DialogResult.OK)
                    {
                        color = colorDialog1.Color;
                    }                }
               
                int a = Convert.ToInt32(e.X);
                int b = Convert.ToInt32(e.Y );
                Shape shapeselect = new Shape(a,b, trackBarsize.Value, trackBarsize.Value, color);
                shapeselect.Draw(paper, r.Text);
                paper.Dispose();
我移到后面了，可是，picturebox照样雷打不动的不给我在鼠标点位置显示shape ~~!

Answer 10

就我前面那一大串的if statement的情况，在后面写code去画shape不应该这样写吗？？

Answer 11

Shape shapeselect = new Shape(a, b, trackBarsize.Value, trackBarsize.Value, color);  
是wpf程序？

Answer 12

我写了一个关于shape的class ，就是要求shapa (x_,y_,w_,h_,color)，所以我可以在form1 call  Shape shapeselectet

Answer 13

Shape shapeselect = new Shape(a,b, trackBarsize.Value, trackBarsize.Value, color);
shapeselect.Draw(paper, r.Text); 
替换成
paper.DrawString(new Pen(r.Text, new Font("Arial", 16), new SolidBrush(color), new PointF(a, b));

Answer 14

Error 1 'System.Drawing.Pen' does not contain a constructor that takes '4' arguments \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 34 WindowsFormsApplication2
Error 2 No overload for method 'DrawString' takes '1' arguments \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 17 WindowsFormsApplication2

Answer 15

paper.DrawString(new Pen(r.Text）, new Font("Arial", 16), new SolidBrush(color), new PointF(a, b)); 

Answer 16

Error 1 Unexpected character '）' \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 48 WindowsFormsApplication2
Error 2 The best overloaded method match for 'System.Drawing.Pen.Pen(System.Drawing.Brush)' has some invalid arguments \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 34 WindowsFormsApplication2
Error 3 Argument '1': cannot convert from 'string' to 'System.Drawing.Brush' \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 42 WindowsFormsApplication2
Error 4 No overload for method 'DrawString' takes '1' arguments \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 17 WindowsFormsApplication2
Error 5 Only assignment, call, increment, decrement, and new object expressions can be used as a statement \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 44 WindowsFormsApplication2
Error 6 Only assignment, call, increment, decrement, and new object expressions can be used as a statement \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 48 WindowsFormsApplication2
Error 7 Only assignment, call, increment, decrement, and new object expressions can be used as a statement \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 71 WindowsFormsApplication2
Error 8 Only assignment, call, increment, decrement, and new object expressions can be used as a statement \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 94 WindowsFormsApplication2
Error 9 Only assignment, call, increment, decrement, and new object expressions can be used as a statement \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 112 WindowsFormsApplication2
Error 10 Invalid expression term '' \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 48 WindowsFormsApplication2
Error 11 ) expected \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 48 WindowsFormsApplication2
Error 12 Invalid expression term ',' \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 49 WindowsFormsApplication2
Error 13 ; expected \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 49 WindowsFormsApplication2
Error 14 ; expected \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 51 WindowsFormsApplication2
Error 15 Invalid expression term ',' \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 72 WindowsFormsApplication2
Error 16 ; expected \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 72 WindowsFormsApplication2
Error 17 ; expected \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 74 WindowsFormsApplication2
Error 18 Invalid expression term ',' \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 95 WindowsFormsApplication2
Error 19 ; expected \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 95 WindowsFormsApplication2
Error 20 ; expected \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 97 WindowsFormsApplication2
Error 21 Invalid expression term ')' \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 113 WindowsFormsApplication2
Error 22 ; expected \\oslo.scms.waikato.ac.nz\home\fz48\Documents\Visual Studio 2008\Projects\WindowsFormsApplication2\WindowsFormsApplication2\Form1.cs 424 113 WindowsFormsApplication2

Answer 17

这是我做的例子，在Form1中拖入一个pictureBox，并指定其MouseDown事件处理程序：
    public partial class Form1 : Form
    {
        Bitmap bt = new Bitmap(@"c:\1.jpg");
        public Form1()
        {
            InitializeComponent();
        }        private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
        {
            Graphics g = pictureBox1.CreateGraphics();
            int a = 100, b = 10;
            g.DrawString(Text, new Font("Arial", 16), new SolidBrush(Color.FromArgb(0, 255, 0)), new PointF(e.X, e.Y));//写字
            //g.DrawImage(bt, e.Location);//画图
            g.Dispose();
                    }
    }

Answer 18

因为，我在class里是 通过if(shape=="circle")
而且 我的r= radiobutton 称之为 "cicle"
所以，r.text=circle,
所以会判别shape=circle执行画圆

Answer 19

哦，理解错了。
shapeselect.Draw里面怎么写的？

Answer 20

 Shape shape = new Shape(rand.Next(0, pictureBoxshow.Width - trackBarsize.Value), rand.Next(0, pictureBoxshow.Height - trackBarsize.Value), trackBarsize.Value, trackBarsize.Value, color);
            shape.Draw(paper, r.Text);这个市我的随即draw 

Answer 21

private void pictureBoxshow_MouseClick_1(object sender, MouseEventArgs e)
        {
Shape shape = new Shape(MousePosition .X - pictureBoxshow.Width, MousePosition .Y - pictureBoxshow .Height , trackBarsize.Value, trackBarsize.Value, color);
            shape.Draw(paper, r.Text);我通过这个 倒是可以在picturebox画图了，但是。图的位置总有偏差。。如果我写成Shape shape = new Shape(MousePosition .X  ， MousePosition .Y , trackBarsize.Value, trackBarsize.Value, color);就 什么都划不出来了。。

Answer 22

MousePosition是相对于窗体的坐标，所以要剪掉picturebox的起点坐标，才能得到相对于picturebox的相对坐标，这个可能还要减去picturebox的margin和padging。用MouseDown事件中MouseEventArgs e的e.Location是最准确的

Answer 23

如果我写成Shape shape = new Shape(MousePosition .X  ， MousePosition .Y , trackBarsize.Value, trackBarsize.Value, color);就 什么都划不出来了。。那是画到picturebox外面去了。

Answer 24

超级感谢大哥阿！！！！！！！！！！！！！！！！！！！！！！完成了~~~~~~~~~
 Shape shape = new Shape(e.X, e.Y, trackBarsize.Value, trackBarsize.Value, color);
            shape.Draw(paper, r.Text);
就这么一句话+ 
private void pictureBoxshow_MouseClick(object sender, MouseEventArgs e)
我从早上8点到实验室一直折腾到下午5点。。太感谢了！！！！！！！！！！0210549147我的qq 太谢谢大哥了！！！！！！看来这个课程不会挂掉了~~这个课程的fail率至少60%。