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Changed implementation. Now tests font rendering on different sizes.

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the_fiddler 2007-11-06 21:02:01 +00:00
parent 72eebfa51c
commit afd70b2e25
1 changed files with 36 additions and 121 deletions
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157
Source/Examples/Tutorial/Fonts.cs
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@ -15,84 +15,64 @@ using OpenTK.OpenGL;
using OpenTK.Input; using OpenTK.Input;
using System.IO; using System.IO;
using OpenTK.OpenGL.Enums; using OpenTK.OpenGL.Enums;
using OpenTK.Math;
namespace Examples.Tutorial namespace Examples.Tutorial
{ {
class Fonts : GameWindow, IExample class Fonts : GameWindow, IExample
{ {
public Fonts() : base(new DisplayMode(800, 600), String.Format("OpenTK | Tutorial {0}: Fonts", order)) public Fonts() : base(new DisplayMode(800, 600), String.Format("OpenTK | Tutorial {0}: Fonts", order))
{ }
ITextPrinter text = new TextPrinter();
// Load some different TextureFont sizes to compare their quality.
TextureFont[] fonts = new TextureFont[]
{ {
this.VSync = VSyncMode.On; new TextureFont(new Font(FontFamily.GenericSerif, 8.0f)),
} new TextureFont(new Font(FontFamily.GenericSerif, 10.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 12.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 14.0f)),
TextureFont serif = new TextureFont(new Font(FontFamily.GenericSerif, 24.0f)); new TextureFont(new Font(FontFamily.GenericSerif, 16.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 18.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 20.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 22.0f)),
//string[] poem = new StreamReader("Data/Poem.txt").ReadToEnd().Replace('\r', ' ').Split('\n'); new TextureFont(new Font(FontFamily.GenericSerif, 24.0f)),
string[] poem = new string[] { "AAA", "AAAAA" }; new TextureFont(new Font(FontFamily.GenericSerif, 26.0f)),
float scroll_speed; new TextureFont(new Font(FontFamily.GenericSerif, 28.0f)),
float scroll_position; new TextureFont(new Font(FontFamily.GenericSerif, 30.0f)),
float initial_position;
float warparound_position; new TextureFont(new Font(FontFamily.GenericSerif, 32.0f)),
float current_position; new TextureFont(new Font(FontFamily.GenericSerif, 34.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 36.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 38.0f)),
};
TextHandle[] handles; // Used to cache the strings we want to print.
public override void OnLoad(EventArgs e) public override void OnLoad(EventArgs e)
{ {
GL.Enable(EnableCap.Texture2d); GL.ClearColor(Color.SteelBlue);
GL.Enable(EnableCap.Blend);
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
//serif.LoadGlyphs("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz,.!?;()\'- "); handles = new TextHandle[fonts.Length];
serif.LoadGlyphs("A"); for (int i = handles.Length; --i >= 0; )
text.Prepare("Hello, world!", fonts[i], out handles[i]);
GL.ClearColor(Color.Gray);
current_position = initial_position;
scroll_speed = -1.0f;
/*
display_list = GL.GenLists(1);
GL.NewList(1, GL.Enums.ListMode.COMPILE);
GL.PushMatrix();
GL.PopMatrix();
GL.EndList();*/
} }
protected override void OnResize(OpenTK.Platform.ResizeEventArgs e) protected override void OnResize(OpenTK.Platform.ResizeEventArgs e)
{ {
GL.Viewport(0, 0, Width, Height); GL.Viewport(0, 0, Width, Height);
initial_position = Height + serif.Height;
warparound_position = -(poem.Length + 1) * serif.Height;
} }
public override void OnUpdateFrame(UpdateFrameEventArgs e) public override void OnUpdateFrame(UpdateFrameEventArgs e)
{ {
if (Keyboard[Key.Space])
scroll_speed = 0.0f;
if (Keyboard[Key.Down])
scroll_speed += 1;
if (Keyboard[Key.Up])
scroll_speed -= 1;
if (Keyboard[Key.Escape]) if (Keyboard[Key.Escape])
this.Exit(); this.Exit();
} }
public override void OnRenderFrame(RenderFrameEventArgs e) public override void OnRenderFrame(RenderFrameEventArgs e)
{ {
// We'll start printing from the lower left corner of the screen. The text
// will slowly move updwards - the user can control the movement speed with
// the keyboard arrows and the space bar.
current_position += scroll_speed * (float)e.ScaleFactor;
if (scroll_speed > 0.0f && current_position > initial_position)
current_position = warparound_position;
else if (scroll_speed < 0.0f && current_position < warparound_position)
current_position = initial_position;
scroll_position = current_position;
GL.Clear(ClearBufferMask.ColorBufferBit); GL.Clear(ClearBufferMask.ColorBufferBit);
GL.MatrixMode(MatrixMode.Projection); GL.MatrixMode(MatrixMode.Projection);
@ -102,77 +82,12 @@ namespace Examples.Tutorial
GL.MatrixMode(MatrixMode.Modelview); GL.MatrixMode(MatrixMode.Modelview);
GL.LoadIdentity(); GL.LoadIdentity();
GL.Translate(0.0f, scroll_position, 0.0f); // Font size test:
for (int i = 0; i < handles.Length; i++)
//RectangleF rect = serif.FindRectangle('A');
RectangleF rect = new RectangleF();
float width, height;
int texture;
serif.GlyphData('A', ref rect, out width, out height, out texture);
GL.BindTexture(TextureTarget.Texture2d, texture);
GL.Enable(EnableCap.Blend);
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
//GL.Color4(Color.White);
GL.Begin(BeginMode.Quads);
GL.TexCoord2(rect.Left, rect.Top);
GL.Vertex2(0.0, 0.0);
GL.TexCoord2(rect.Right, rect.Top);
GL.Vertex2(width, 0.0);
GL.TexCoord2(rect.Right, rect.Bottom);
GL.Vertex2(width, height);
GL.TexCoord2(rect.Left, rect.Bottom);
GL.Vertex2(0.0, height);
GL.End();
serif.Draw();
/*
int i = 0, line = 0;
float x_pos, accum_x_pos = 0.0f;
foreach (string str in poem)
{ {
GL.Translate(0.0f, scroll_position + serif.Height * line, 0.0f); text.Draw(handles[i]);
foreach (char c in str) GL.Translate(0, fonts[i].Height, 0);
{
//serif.PrintFast(c);
RectangleF rect = serif.FindRectangle(c);
//GL.Color4(Color.White);
GL.Begin(GL.Enums.BeginMode.QUADS);
GL.TexCoord2(rect.Left, rect.Top);
GL.Vertex2(0.0f, 0.0f);
GL.TexCoord2(rect.Right, rect.Top);
GL.Vertex2(rect.Width * 512, 0.0f);
GL.TexCoord2(rect.Right, rect.Bottom);
GL.Vertex2(rect.Width * 512, rect.Height * 512);
GL.TexCoord2(rect.Left, rect.Bottom);
GL.Vertex2(0.0f, rect.Height * 512);
GL.End();
x_pos = serif.MeasureWidth(str.Substring(i++, 1));
accum_x_pos += x_pos;
GL.Translate((int)(x_pos + 0.5f), 0.0f, 0.0f);
}
GL.LoadIdentity();
i = 0;
++line;
} }
*/
//GL.CallList(display_list);
SwapBuffers(); SwapBuffers();
} }
@ -180,13 +95,13 @@ namespace Examples.Tutorial
#region IExample Members #region IExample Members
public static readonly int order = 6;
public void Launch() public void Launch()
{ {
Run(30.0, 0.0); Run(30.0, 0.0);
} }
public static readonly int order = 6;
#endregion #endregion
} }
} }