【WPF】绘制水平尺

储备知识

Pen、Brushes、绘图类Drawing、DrawingVisual类的使用

效果

源代码

using System;
using System.Collections.Generic;
using Drawing = System.Drawing;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls.Primitives;
using System.Windows.Media;

namespace VisualPlay
{

    public class CustomTickBar : TickBar
    {


        ///隔N个Frequency 写上刻度文字
        public int IntervalText
        {
            get { return (int)GetValue(IntervalTextProperty); }
            set { SetValue(IntervalTextProperty, value); }
        }

        // Using a DependencyProperty as the backing store for MyProperty.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty IntervalTextProperty =
            DependencyProperty.Register("IntervalText", typeof(int), typeof(CustomTickBar), new PropertyMetadata(5));



        public int StartAxisY
        {
            get { return (int)GetValue(StartAxisYProperty); }
            set { SetValue(StartAxisYProperty, value); }
        }

        // Using a DependencyProperty as the backing store for StartAxisY.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty StartAxisYProperty =
            DependencyProperty.Register("StartAxisY", typeof(int), typeof(CustomTickBar), new PropertyMetadata(0));



       
        void OnRenderHorizontalRuler(DrawingContext dc)
        {
            Double tickFrequencySize;
            Brush foreBrush = this.Fill;
            Pen line_Pen = new Pen(foreBrush, 1);

            FormattedText font = null;
            Size size = new Size(base.ActualWidth, base.ActualHeight);
            int tickCount = (int)((this.Maximum - this.Minimum) / this.TickFrequency) + 1;
            if ((this.Maximum - this.Minimum) % this.TickFrequency == 0)
                tickCount -= 1;
            tickFrequencySize = (size.Width * this.TickFrequency / (this.Maximum - this.Minimum));
            string text = "";
            double num = this.Maximum - this.Minimum;
            int i = 0;
            for (i = 0; i <= tickCount; i++)
            {
                ///隔N个Frequency 写上刻度
                if (i % IntervalText == 0)
                {
                    text = Convert.ToString(Convert.ToInt32(this.Minimum + this.TickFrequency * i), 10);
                    font = new FormattedText(text, CultureInfo.GetCultureInfo("en-us"), FlowDirection.LeftToRight, new Typeface("Verdana"), 14, foreBrush);
                    dc.DrawText(font, new Point(tickFrequencySize * i, 20));
                    //
                    Point startpoint = new Point(tickFrequencySize * i, StartAxisY + 4);
                    Point endpoint = new Point(tickFrequencySize * i, StartAxisY + 24);
                    dc.DrawLine(line_Pen, startpoint, endpoint);
                }
                else
                {
                    dc.DrawLine(line_Pen, new Point(tickFrequencySize * i, StartAxisY + 14), new Point(tickFrequencySize * i, StartAxisY + 24));
                }
            }

        }
        protected override void OnRender(DrawingContext dc)
        {
            OnRenderHorizontalRuler(dc);
        }
    }
}