Question

你如何使用变量绘制C＃？

我设法绘制了一些形状，但只有当我硬编码的长度。我需要使用轨迹条绘制形状以获得长度。

public abstract class Shape
{
    //private String shape;
    private int length;
}

public virtual void setLength(int newLength)
{
    this.length = newLength;
}

public virtual int getLength()
{
    return length;
}

//public String getShape()
//{
//    return shape;
//}

//abstract public double getLength(float length);

abstract public float getPerimeter(int length);

abstract public float getArea(int length);

仅显示方形类，但此项目还包括三角形和方形。

using System;
using System.Drawing;

public class Square : Shape
{
    private float perimeter, area;

    public override float getPerimeter(int length)
    {
        perimeter = length*4;
        return perimeter;
    }

    public override float getArea(int length)
    {
        area = length*length;
        return area;
    }
}

这是包含所有事件处理程序的类

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;

namespace shapes
{
    //private System.Windows.Forms.TrackBar trackBar1;

    public partial class Form1 : Form
    {        
        private Shape shape;
        private int length = 0;
        private int shapeL = 0;

        public Form1()
        {
            InitializeComponent();
        }

        private void panel2_Paint(object sender, PaintEventArgs e)
        {

        }

        private void menuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
        {

        }

        private void trackBar1_Scroll(object sender, EventArgs e)
        {
            label3.Text = "Length Slider: " + trackBar1.Value;

            textBox1.Text = shape.getPerimeter(shape.getLength()).ToString("0.00");
            textBox2.Text = shape.getArea(shape.getLength()).ToString("0.00");

            textBox1.Refresh();
            textBox2.Refresh();

            length = trackBar1.Value;
            shape.setLength(length);
        }

        private void onCircleClick(object sender, EventArgs e)
        {
            shape = new Circle();
            //length = trackBar1.Value;
            length = shape.getLength();
            this.Refresh();

            using (Graphics g = this.panel1.CreateGraphics())
            {
                Pen pen = new Pen(Color.Black, 2);
                Graphics formGraphics;
                formGraphics = this.panel1.CreateGraphics();
                formGraphics.DrawEllipse(pen, 50, 50, length, length);
                //g.DrawEllipse(pen, 100, 100, length, length);

            }
        }

        private void onSquareClick(object sender, EventArgs e)
        {
            shape = new Square();
            length = trackBar1.Value;


            using (Graphics g = this.panel1.CreateGraphics())
            {
                Pen pen = new Pen(Color.Black, 2);

                g.DrawRectangle(pen, 50, 50, length, length);

                System.Windows.Forms.MessageBox.Show("lenght is: " + length);
            }
        }

        private void onTriangleClick(object sender, EventArgs e)
        {
            shape = new Triangle();
            length = trackBar1.Value;

            using (Graphics g = this.panel1.CreateGraphics())
            {
                SolidBrush blueBrush = new SolidBrush(Color.Blue);

                // Create points that define polygon.
                Point point1 = new Point(50, 50);
                Point point2 = new Point(50, 100);
                Point point3 = new Point(100, 50);
                Point[] curvePoints = { point1, point2, point3};

                // Draw polygon to screen.
                g.FillPolygon(blueBrush, curvePoints);
            }
        }

        private void shapeToolStripMenuItem_Click(object sender, EventArgs e)
        {

        }

        protected override void OnPaint(PaintEventArgs pe)
        {
            base.OnPaint(pe);

            Pen pen = new Pen(Color.Black, 2);

            Graphics g = pe.Graphics;
            g = this.CreateGraphics();
            g.DrawRectangle(pen, 50, 50, length, length);
        }

        private void OnPaint(object sender, PaintEventArgs e)
        {

        }
    }
}

是的，它非常凌乱，你可以看到香港专业教育学院尝试了各种各样的东西。

panel1_paint和onPaint之间的区别是什么？你可以看到我不太确定如何使用eventhandler，onCircleClick基本上是一个菜单项按钮，但我如何从另一个eventhandler（onCircleClick）激活一个不同的eveenthandler（panel1_Paint）？

是否需要在* _paint / OnPaint方法中绘制图形？我已经得到了我的正常面板。

接下来是将轨迹栏值赋予形状对象并再次返回方法的最佳操作方法？是的，数据被保存（我认为）当我使用displayMessage（shape.getLength）它显示长度，通常是一个。

在java中为c＃重新编写equilent（）吗？香港专业教育学院尝试过.Refresh（）;但它不起作用它会绘制形状然后使它消失。

我正在写我的二传手/吸气手吗？或者我应该使用

public int X
{
    get {return x;}
    set {x = value;}
}

在java中，图形会在任何面板上绘制，在c＃中它是否需要在特定的容器中？

Answer 1

这非常简单，可以说您想在private void panel2_Paint(object sender, PaintEventArgs e)上绘画。您所要做的就是在您的{ e.Graphics.Clear(panel1.BackgroundColor); int length = trackBar1.Value; Pen pen = new Pen(Color.Black, 2); e.Graphics.DrawRectangle(pen, 50, 50, length, length); }正文中编写该代码。

panel2.Refresh()

，每当您要刷新图形时，都可以调用panel2.Invalidate()或panel2。两者都会做。

请注意，如果您这样做，<!DOCTYPE html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>Document</title> <script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/1.4.4/jquery.min.js"></script> </head> <body> <button onClick="load()">load</button> <button onClick="check()">check</button> </body> <script> function load() { var scriptElement = document.createElement("script"); scriptElement.onload = function () { console.log("Successfully loaded script 2 using (onload)."); }; scriptElement.src = "https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"; document.head.appendChild(scriptElement); } function check() { console.log(angular.element == jQuery) // false } </script> </html>在绘制形状之前不会像以前一样被清除。
还请注意，更改轨迹栏值时，面板将闪烁。我知道如何处理，但是我现在不想使解决方案复杂化。

如何使用轨迹栏绘制？

1 个答案: