C# GDI+實現時鐘表盤
本文實例為大傢分享瞭C# GDI+實現時鐘表盤的具體代碼，供大傢參考，具體內容如下
一、設計如下圖界面
按鍵“打開時鐘”按下後會出現表盤，按鍵“退出”按下後會關閉頁面。
二、多線程初始化和函數初始化
public Form1()
{
InitializeComponent();
generateBtn();
Control.CheckForIllegalCrossThreadCalls = false;
}
對按鍵 重命名
void generateBtn()
{
Button bt1 = button1;
bt1.Text = "打開時鐘";
Button bt2 = button2;
bt2.Text = "退出";
}
三、按鍵“打開時鐘”按下
打開多線程，運行時鐘相關程序。
private void button1_Click(object sender, EventArgs e)
{
ThreadStart thStart = new ThreadStart(Start);
Thread thread = new Thread(thStart);
thread.Priority = ThreadPriority.Highest;
thread.IsBackground = true; //關閉窗體繼續執行
thread.Start();
}
四、時鐘主函數
給定表盤圓心坐標和半徑，初始化一些畫筆顏色和畫刷大小以及一些變量，通過半徑和圓心計算表盤上各點的坐標，讀取並記錄電腦上的時間戳，計算時針分針秒針的角度，通過之前計算結果繪制表盤。
每隔一秒（檢測讀取到的時、分、秒發生變化）擦除一遍頁面，重新計算坐標點，重新繪制新的表盤。
private void Start()
{
var graph = this.pictureBox1.CreateGraphics();
double[] Sin = new double[60];
double[] Cos = new double[60];
float[] x = new float[60];
float[] y = new float[60];
float[] x1 = new float[60];
float[] y1 = new float[60];
float[] x2 = new float[60];
float[] y2 = new float[60];
float[] x3 = new float[60];
float[] y3 = new float[60];
float[] x4 = new float[60];
float[] y4 = new float[60];
float x5 =0;
float y5 =0;
float r0 = 0;
string tradeTime = DateTime.Now.ToString("hhmmss",System.Globalization.DateTimeFormatInfo.InvariantInfo);
var pencoler1 = new Pen(Color.Red);
var pencoler2 = new Pen(Color.Yellow);
var pencoler3 = new Pen(Color.Black);
var pensize = new Pen(Color.Black, 3);
var pensize1 = new Pen(Color.Red, 2);
var pensize2 = new Pen(Color.Black, 4);
int i;
int z = 0;
int x0 = 500;
int y0 = 300;
int r = 300;
int sec, min, hour;
int secn = 0, minn = 0, hourn = 0;
int Time;
for (i = 0; i < 60; i++)
{
//if (i == 0 || i == 30 || i == 15 || i == 45) { continue; }
double d = (((i * 6) - 90) * 3.1415) / 180;
Sin[i] = Math.Sin(d);
Cos[i] = Math.Cos(d);
y[i] = (float)(Sin[i] * r) + y0;
x[i] = (float)(Cos[i] * r) + x0;
x1[i] = x[i] - (x[i] - x0) / 10;
y1[i] = y[i] - (y[i] - y0) / 10;
x2[i] = x[i] - (x[i] - x0) / 7 - r / 20;
y2[i] = y[i] - (y[i] - y0) / 7 - r / 20;
x3[i] = x[i] - (x[i] - x0) / 20;
y3[i] = y[i] - (y[i] - y0) / 20;
x4[i] = x[i] - (x[i] - x0) / 2;
y4[i] = y[i] - (y[i] - y0) / 2;
x5 = x0 - r / 40;
y5 = y0 - r / 40;
r0 = r / 20;
}
Brush penbrush = new SolidBrush(Color.Black);
Font penfont = new Font("華文行楷", r / 20);
for (; ; )
{
tradeTime = DateTime.Now.ToString("hhmmss", System.Globalization.DateTimeFormatInfo.InvariantInfo);
Time = int.Parse(tradeTime);
sec = Time % 100;
min = Time / 100 % 100;
hour = Time / 10000;
if (hour == 12) { hour = 0; }
if (secn != sec || minn != min || hourn != hour)
{
//MessageBox.Show(sec.ToString());
graph.Clear(this.BackColor);
//graph.DrawEllipse(pencoler2, x0 - r, y0 - r, 2*r, 2*r);
for (i = 0; i < 60; i++)
{
if (i % 5 == 0)
{
z = i / 5;
if (z == 0) z = 12;
graph.DrawLine(pensize, x[i], y[i],x1[i],y1[i]);
graph.DrawString(z.ToString(), penfont, penbrush, x2[i], y2[i]);
}
else
{
graph.DrawLine(pencoler3, x[i], y[i], x3[i], y3[i]);
}
}
graph.DrawLine(pensize1, x0, y0, x[sec], y[sec]);
graph.DrawLine(pensize2, x0, y0, x[min], y[min]);
graph.DrawLine(pensize2, x0, y0, x4[hour*5], y4[hour*5]);
//graph.DrawPie(pencoler2, x0-r, y0-r, 2*r, 2*r, sec * 6-90, 1);
//graph.DrawPie(pencoler3, x0-r , y0-r , r*2, r*2, min * 6-90, 1);
//graph.DrawPie(pencoler3, x0-r/2 , y0-r/2 , r, r, hour*30-90, 2);
secn = sec;
minn = min;
hourn = hour;
graph.FillEllipse(new SolidBrush(Color.Yellow), x5 , y5 , r0, r0);
continue;
}
}
}
五、“退出”按鍵按下後
得益於多線程的使用，在表盤一直處於死循環監測時間變化的同時，依然能檢測到Button的按下。
“退出”按下後，退出頁面。
private void button2_Click(object sender, EventArgs e)
{
Application.Exit();
}
六、表盤上各點的計算
以上就是本文的全部內容，希望對大傢的學習有所幫助，也希望大傢多多支持WalkonNet。