310 lines
9.5 KiB
C#
310 lines
9.5 KiB
C#
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/*
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* ScreenSaverForm.cs
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* By Frank McCown
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* Summer 2010
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*
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* Feel free to modify this code.
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*/
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Linq;
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using System.Text;
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using System.Windows.Forms;
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using System.Runtime.InteropServices;
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using Microsoft.Win32;
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namespace ScreenSaver
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{
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public partial class ScreenSaverForm : Form
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{
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#region Win32 API functions
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[DllImport("user32.dll")]
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static extern IntPtr SetParent(IntPtr hWndChild, IntPtr hWndNewParent);
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[DllImport("user32.dll")]
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static extern int SetWindowLong(IntPtr hWnd, int nIndex, IntPtr dwNewLong);
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[DllImport("user32.dll", SetLastError = true)]
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static extern int GetWindowLong(IntPtr hWnd, int nIndex);
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[DllImport("user32.dll")]
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static extern bool GetClientRect(IntPtr hWnd, out Rectangle lpRect);
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#endregion
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private static readonly int MAXSTARS = 1000;
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private static readonly int MAXPOS = 3000;
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private static readonly int MAXWARP = 3;
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public struct StarRec
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{
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public decimal[] x, y, z;
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public decimal offsetX, offsetY, offsetR, rotation;
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};
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decimal nitro = 0;
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int m_windW;
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int m_windH;
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readonly int starCount = MAXSTARS / 2;
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decimal m_speed = 0.2m;
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StarRec[] m_stars;
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private Point mouseLocation;
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private bool previewMode = false;
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private readonly Random rand = new Random((int)DateTime.Now.Ticks);
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public ScreenSaverForm()
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{
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InitializeComponent();
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Init();
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}
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public ScreenSaverForm(Rectangle Bounds)
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{
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InitializeComponent();
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this.Bounds = Bounds;
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Init();
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}
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public ScreenSaverForm(IntPtr PreviewWndHandle)
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{
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InitializeComponent();
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Init();
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// Set the preview window as the parent of this window
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SetParent(this.Handle, PreviewWndHandle);
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// Make this a child window so it will close when the parent dialog closes
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SetWindowLong(this.Handle, -16, new IntPtr(GetWindowLong(this.Handle, -16) | 0x40000000));
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// Place our window inside the parent
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GetClientRect(PreviewWndHandle, out Rectangle ParentRect);
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Size = ParentRect.Size;
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Location = new Point(0, 0);
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previewMode = true;
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}
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private void ScreenSaverForm_Load(object sender, EventArgs e)
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{
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Cursor.Hide();
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TopMost = true;
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moveTimer.Interval = 10;
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moveTimer.Tick += new EventHandler(MoveTimer_Tick);
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moveTimer.Start();
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NitroTimer.Interval = 180000;
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NitroTimer.Start();
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}
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private void MoveTimer_Tick(object sender, System.EventArgs e)
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{
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this.Invalidate();
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}
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private void ScreenSaverForm_MouseMove(object sender, MouseEventArgs e)
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{
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if (!previewMode)
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{
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if (!mouseLocation.IsEmpty)
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{
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// Terminate if mouse is moved a significant distance
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if (Math.Abs(mouseLocation.X - e.X) > 5 ||
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Math.Abs(mouseLocation.Y - e.Y) > 5)
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Application.Exit();
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}
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// Update current mouse location
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mouseLocation = e.Location;
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}
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}
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private void ScreenSaverForm_KeyPress(object sender, KeyPressEventArgs e)
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{
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switch (e.KeyChar)
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{
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case 'x':
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nitro = 3;
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break;
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case '+':
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case '=':
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m_speed += 0.001m;
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break;
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case '-':
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case '_':
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m_speed -= 0.001m;
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break;
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default:
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if (!previewMode)
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Application.Exit();
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break;
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}
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}
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private void ScreenSaverForm_MouseClick(object sender, MouseEventArgs e)
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{
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if (!previewMode)
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Application.Exit();
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}
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private void Init()
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{
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int n;
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m_windW = Bounds.Width;
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m_windH = Bounds.Height;
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m_stars = new StarRec[MAXSTARS];
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for (n = 0; n < MAXSTARS; n++)
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{
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NewStar(n, 100);
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}
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this.DoubleBuffered = true;
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}
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void NewStar(int n, int d)
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{
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m_stars[n].x = new decimal[] { 0, 0 };
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m_stars[n].y = new decimal[] { 0, 0 };
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m_stars[n].z = new decimal[] { 0, 0 };
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m_stars[n].x[0] = (rand.Next() % MAXPOS) - MAXPOS / 2;
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m_stars[n].y[0] = (rand.Next() % MAXPOS) - MAXPOS / 2;
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m_stars[n].z[0] = (rand.Next() % MAXPOS) + d;
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m_stars[n].x[1] = m_stars[n].x[0];
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m_stars[n].y[1] = m_stars[n].y[0];
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m_stars[n].z[1] = m_stars[n].z[0];
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m_stars[n].offsetX = 0;
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m_stars[n].offsetY = 0;
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m_stars[n].offsetR = 0;
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}
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bool StarPoint(int n)
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{
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decimal x0, y0;
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x0 = m_stars[n].x[0] * m_windW / m_stars[n].z[0];
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y0 = m_stars[n].y[0] * m_windH / m_stars[n].z[0];
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x0 += m_windW / 2;
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y0 += m_windH / 2;
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if (x0 >= 0 && x0 < m_windW && y0 >= 0 && y0 < m_windH)
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{
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return true;
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}
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return false;
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}
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void ShowStar(int n, PaintEventArgs e)
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{
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decimal x0, y0, x1, y1;
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x0 = m_stars[n].x[0] * m_windW / m_stars[n].z[0];
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y0 = m_stars[n].y[0] * m_windH / m_stars[n].z[0];
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x0 += m_windW / 2;
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y0 += m_windH / 2;
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if (x0 >= 0 && x0 < m_windW && y0 >= 0 && y0 < m_windH)
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{
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x1 = m_stars[n].x[1] * m_windW / m_stars[n].z[1];
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y1 = m_stars[n].y[1] * m_windH / m_stars[n].z[1];
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x1 += m_windW / 2;
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y1 += m_windH / 2;
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Color color = Color.FromArgb((int) (255 * ((MAXWARP - m_speed) / MAXWARP)), (int)(255 * ((MAXWARP - m_speed) / MAXWARP)), 255);
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using (Pen pen = new Pen(color, (float)(MAXPOS / 100 / m_stars[n].z[0] + 2)))
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{
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if (Math.Abs(x0 - x1) < 1 && Math.Abs(y0 - y1) < 1)
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{
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e.Graphics.DrawLine(pen, (float)x0, (float)y0, (float)x0, (float)y0);
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}
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else
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{
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e.Graphics.DrawLine(pen, (float)x0, (float)y0, (float)x1, (float)y1);
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}
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}
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var s = m_speed >= 1.0m ? $"Warp Factor {m_speed}" : $"Impulse {m_speed}";
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using (Brush b = new SolidBrush(Color.White))
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e.Graphics.DrawString(s, new Font(FontFamily.GenericMonospace, 8.0f), b, 0, 0);
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}
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}
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void ShowStars(PaintEventArgs e)
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{
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int n;
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decimal offset;
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for (n = 0; n < starCount; n++)
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{
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if (nitro > 0)
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{
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m_speed = (nitro / 10.0m) + 0.2m;
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if (m_speed > MAXWARP)
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{
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m_speed = MAXWARP;
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}
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nitro += 0.0001m;
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if (nitro > MAXWARP * 10)
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{
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nitro = -nitro;
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}
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}
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else if (nitro < 0)
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{
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nitro += 0.0001m;
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m_speed = (-nitro / 10.0m) + 0.2m;
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if (m_speed > MAXWARP)
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{
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m_speed = MAXWARP;
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}
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}
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offset = m_speed * 60;
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m_stars[n].x[1] = m_stars[n].x[0];
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m_stars[n].y[1] = m_stars[n].y[0];
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m_stars[n].z[1] = m_stars[n].z[0];
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m_stars[n].x[0] = m_stars[n].x[0] + m_stars[n].offsetX;
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m_stars[n].y[0] = m_stars[n].y[0] + m_stars[n].offsetY;
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m_stars[n].z[0] = m_stars[n].z[0] - offset;
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m_stars[n].rotation = m_stars[n].rotation + m_stars[n].offsetR;
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if (m_stars[n].z[0] > m_speed || (m_stars[n].z[0] > 0 && m_speed < MAXWARP))
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{
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if (!StarPoint(n))
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{
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NewStar(n, MAXPOS);
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}
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}
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else
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{
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NewStar(n, MAXPOS);
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}
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if (m_stars[n].z[0] > m_speed || (m_stars[n].z[0] > 0 && m_speed < MAXWARP))
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{
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ShowStar(n, e);
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}
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}
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}
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private void ScreenSaverForm_Paint(object sender, PaintEventArgs e)
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{
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ShowStars(e);
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}
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private void NitroTimer_Tick(object sender, EventArgs e)
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{
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nitro = 10;
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}
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}
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}
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