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https://github.com/Ryujinx/Opentk.git
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110 lines
3.6 KiB
C#
110 lines
3.6 KiB
C#
#region --- License ---
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/* Copyright (c) 2006, 2007 Stefanos Apostolopoulos
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* See license.txt for license info
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*/
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#endregion
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using System;
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using System.Collections.Generic;
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using System.Text;
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using System.Drawing;
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using OpenTK;
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using OpenTK.Fonts;
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using OpenTK.OpenGL;
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using OpenTK.Input;
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using System.IO;
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namespace Examples.Tutorial
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{
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class Fonts : GameWindow, IExample
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{
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public Fonts() : base(new DisplayMode(800, 600), String.Format("OpenTK | Tutorial {0}: Fonts", order))
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{
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this.VSync = VSyncMode.On;
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}
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TextureFont serif;
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string[] poem = new StreamReader("Data\\Poem.txt").ReadToEnd().Replace('\r', ' ').Split('\n');
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float scroll_speed;
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float scroll_position;
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float initial_position;
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float warparound_position;
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float current_position;
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public override void OnLoad(EventArgs e)
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{
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GL.Enable(GL.Enums.EnableCap.TEXTURE_2D);
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serif = new TextureFont(new Font(FontFamily.GenericSerif, 24, FontStyle.Regular, GraphicsUnit.Pixel));
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serif.LoadGlyphs("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz,.!?");
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scroll_speed = 4/(float)Height;
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initial_position = -1.0f - 64 / (float)Height; // 64 pixels below the bottom of the screen;
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warparound_position = 7.0f;
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current_position = initial_position;
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}
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protected override void OnResize(OpenTK.Platform.ResizeEventArgs e)
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{
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GL.Viewport(0, 0, Width, Height);
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GL.MatrixMode(GL.Enums.MatrixMode.PROJECTION);
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GL.LoadIdentity();
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GL.Ortho(-1.0, 1.0, -1.0, 1.0, 0.0, 16.0);
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}
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public override void OnUpdateFrame(UpdateFrameEventArgs e)
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{
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if (Keyboard[Key.Space])
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scroll_speed = 0.0f;
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if (Keyboard[Key.Down])
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scroll_speed -= 1 / (float)Height;
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if (Keyboard[Key.Up])
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scroll_speed += 1 / (float)Height;
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if (Keyboard[Key.Escape])
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this.Exit();
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}
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public override void OnRenderFrame(RenderFrameEventArgs e)
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{
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GL.MatrixMode(GL.Enums.MatrixMode.MODELVIEW);
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GL.LoadIdentity();
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// We'll start printing from the lower left corner of the screen. The text
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// will slowly move updwards - the user can control the movement speed with
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// the keyboard arrows and the space bar.
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current_position += scroll_speed * (float)e.ScaleFactor;
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if (current_position > 0.0f && current_position > warparound_position)
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current_position = initial_position;
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else if (current_position < 0.0f && current_position < initial_position)
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current_position = warparound_position;
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scroll_position = ((int)(current_position * (float)Height)) / (float)Height; // Round to closest pixel.
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GL.Translate(-1.0f, scroll_position, 0.0f);
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GL.Clear(GL.Enums.ClearBufferMask.COLOR_BUFFER_BIT);
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float line_spacing = -2.0f * serif.LineSpacing / (float)Height;
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foreach (string line in poem)
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{
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serif.Print(line);
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GL.Translate(0.0f, line_spacing, 0.0f); // Move to the next line.
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}
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SwapBuffers();
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}
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#region IExample Members
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public void Launch()
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{
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Run(30.0, 85.0);
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}
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public static readonly int order = 6;
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#endregion
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}
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}
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