line 坐标问题

[changmaohai1980]

在一个canvas上有一条直线。知道了开始坐标和结束坐标。。
请问如何计算出这条直线的所有坐标（也就是在这条直线的每个点的坐标。）？

[Error_Code]

有起点和终点 线上的点的坐标跟画线算法有关

[changmaohai1980]

请问如何做呢？

[changmaohai1980]

jv9
(冷秋寒)

感谢您的回复.
您的代码我运行的结果为:
Vector 1 :8,10
Vector 2 :0,10
Vector Addition:8,20
Vector 1 Scaled by 2 :16,20

本人菜鸟,没有看出这些值坐标和直线的所有坐标有啥关系.

[xingjunli]

<UserControl xmlns:data="clr-namespace:System.Windows.Controls;assembly=System.Windows.Controls.Data"  x:Class="LoadSilverlight.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    mc:Ignorable="d" d:DesignWidth="640" d:DesignHeight="480">
  <Grid x:Name="LayoutRoot">
        <Canvas Background="Green" Margin="0,60,0,1" x:Name="drawCanvas"/>
        <TextBox x:Name="txtS" Height="30" HorizontalAlignment="Left" Margin="29,11,0,0" VerticalAlignment="Top" Width="147" TextWrapping="Wrap" Text="50,50"/>
        <TextBox x:Name="txtEnd" Height="30" Margin="224,11,259,0" VerticalAlignment="Top" TextWrapping="Wrap" Text="200,200"/>
        <Button x:Name="btnDraw" Height="30" HorizontalAlignment="Right" Margin="0,11,115,0" VerticalAlignment="Top" Width="87" Content="Button"/>
    </Grid>
</UserControl>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace LoadSilverlight
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            InitializeComponent();
            Loaded += new RoutedEventHandler(MainPage_Loaded);
            btnDraw.Click += new RoutedEventHandler(btnDraw_Click);
        }

        void btnDraw_Click(object sender, RoutedEventArgs e)
        {
            string [] str1 = txtS.Text.Split(',');
            string[] str2 = txtEnd.Text.Split(',');
            double radius = 2.0;
            List<Point> points = GetLinePoints(new Point(double.Parse(str1[0]), double.Parse(str1[1])), new Point(double.Parse(str2[0]), double.Parse(str2[1])), radius);
            txtEnd.Text = "";

            drawCanvas.Children.Clear();
            Ellipse drawEllipse;
            for (int i = 0; i < points.Count; i++)
            {
                drawEllipse = new Ellipse();
                drawEllipse.Fill = new SolidColorBrush(Colors.White);
                drawEllipse.Width = radius;
                drawEllipse.Height = radius;
                drawCanvas.Children.Add(drawEllipse);
                Canvas.SetLeft(drawEllipse,points[i].X);
                Canvas.SetTop(drawEllipse, points[i].Y);
                txtEnd.Text += String.Format("{0},{1}  ", points[i].X, points[i].Y);

            }
        }

        void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            
        }
        List<Point> GetLinePoints(Point sPoint, Point ePoint, double pointStep)
        {
            List<Point> points = new List<Point>();
            double dx = ePoint.X - sPoint.X;
            double dy = ePoint.Y - sPoint.Y;
            double dest = Math.Sqrt(dx * dx + dy * dy);
            Point p;
            int stepCount = Convert.ToInt32(Math.Abs(dest) / pointStep);
            double xStep = (ePoint.X - sPoint.X) / stepCount;
            double yStep = (ePoint.Y - sPoint.Y) / stepCount;

            for (int i = 1; i <= stepCount; i++)
            {
                p = new Point();
                p.X = sPoint.X + i * xStep;
                p.Y = sPoint.Y + i * yStep;
                points.Add(p);
            }
            return points;
        }
    }
}

代码已测试通过，刚开始想复杂了以为要用直线方程

[jv9]

可以计算出来。

public partial class MainPage : UserControl
    {
        private Point vector1 = new Point();
        private Point vector2 = new Point();

        public MainPage()
        {
            InitializeComponent();

            vector1.X = 8;
            vector1.Y = 10;
            vector2.X = 0;
            vector2.Y = 10;

            writeVectors(vector1, vector2);
            addVectors(vector1, vector2);
            scaleVector(vector1, 2);
        }

        private void writeVectors(Point vectorA, Point vectorB)
        {
            msgBlock.Text = "Vector 1: " + vectorA;
            msgBlock.Text += "\nVector 2: " + vectorB;
        }

        private void addVectors(Point vectorA, Point vectorB)
        {
            Point newVector = new Point();
            newVector.X = vectorA.X + vectorB.X;
            newVector.Y = vectorA.Y + vectorB.Y;
            msgBlock.Text += "\nVector Addition: " + newVector;
        }

        private void scaleVector(Point vectorA, int scale)
        {
            Point newVector = new Point();
            newVector.X = vectorA.X * scale;
            newVector.Y = vectorA.Y * scale;
            msgBlock.Text += "\nVector 1 Scaled by " + scale + ": " + newVector + "";
        }
    }