开贴求助.还是剪切图片.

krisviper 2010-07-13 03:43:55

在图片上画个线框,然后拖动这个线框,拖动线框会很卡.请问怎么解决?

如图：

代码：





        private void pictureBox_Pic_Paint(object sender, PaintEventArgs e)

        {

            Pen p = new Pen(Color.Blue, 1);

            p.DashStyle = System.Drawing.Drawing2D.DashStyle.Solid;

            Rectangle rect = new Rectangle(mPoint1, new Size(mPoint2.X - mPoint1.X, mPoint2.Y - mPoint1.Y));

            e.Graphics.DrawRectangle(p, rect);

        }

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krisviper 2010-07-14

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[Quote=引用 12 楼 hiddkiller 的回复:]

我以前做得有一个.
http://topic.csdn.net/u/20071220/17/d40930c4-93d8-41d8-8d64-28d744499ff7.html
[/Quote]

效果确实是这种效果. 但是鼠标不动之后线框会消失.请问怎么解决?

hiddkiller 2010-07-14

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我以前做得有一个.
http://topic.csdn.net/u/20071220/17/d40930c4-93d8-41d8-8d64-28d744499ff7.html

dylike 2010-07-14

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paint中绘制很闪属于正常现象.如要不闪则用贴图

krisviper 2010-07-14

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[Quote=引用 9 楼 takemoto 的回复:]

楼主，2楼的方法才是你想要的；写了段代码其他的你自己实现吧！
C# code

public partial class MyPictureBox : UserControl
{
bool mouseDown;
Point startPoint = Point.Empty;
Rectangle mouseRect = Rectangle……
[/Quote]

用你给的方法,画框的时候会非常的闪,请问能解决吗?

takemoto 2010-07-13

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楼主，2楼的方法才是你想要的；写了段代码其他的你自己实现吧！



public partial class MyPictureBox : UserControl

    {

        bool mouseDown;

        Point startPoint = Point.Empty;

        Rectangle mouseRect = Rectangle.Empty;

        

        public MyPictureBox()

        {

            InitializeComponent();

        }



        public Bitmap Image { get; set; }



        protected override void OnMouseDown(MouseEventArgs e)

        {

            base.OnMouseDown(e);



            this.Capture = true;

            this.mouseDown = true;

            

            this.startPoint = new Point(e.X, e.Y);

            this.mouseRect = new Rectangle(e.X, e.Y, 0, 0);

            Cursor.Clip = this.RectangleToScreen(this.ClientRectangle);

        }



        protected override void OnMouseMove(MouseEventArgs e)

        {

            base.OnMouseMove(e);



            if (this.mouseDown)

            {

                this.ResizeRectangle(e.Location);

            }

        }



        protected override void OnMouseUp(MouseEventArgs e)

        {

            base.OnMouseUp(e);



            if (this.mouseDown)

            {

                this.Capture = false;

                this.mouseDown = false;



                Cursor.Clip = Rectangle.Empty;



                this.DrawReversibleFrame();



                this.mouseRect = Rectangle.Empty;



                this.DrawReversibleFrame();



            }

        }

        

        void ResizeRectangle(Point p)

        {

            this.DrawReversibleFrame();



            this.mouseRect.Width = p.X - mouseRect.Left;

            this.mouseRect.Height = p.Y - mouseRect.Top;



            this.DrawReversibleFrame();

        }



        void DrawReversibleFrame()

        {

            Rectangle rect = this.RectangleToScreen(this.mouseRect);



            ControlPaint.DrawReversibleFrame(rect, Color.Yellow, FrameStyle.Thick);

        }

    }