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Changed implementation. Now tests font rendering on different sizes.

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This commit is contained in:
the_fiddler 2007-11-06 21:02:01 +00:00
parent 37f94717de
commit 120f96f3bc
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 System.IO;
using OpenTK.OpenGL.Enums;
using OpenTK.Math;
namespace Examples.Tutorial
{
class Fonts : GameWindow, IExample
{
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');
string[] poem = new string[] { "AAA", "AAAAA" };
float scroll_speed;
float scroll_position;
float initial_position;
float warparound_position;
float current_position;
new TextureFont(new Font(FontFamily.GenericSerif, 24.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 26.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 28.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 30.0f)),
new TextureFont(new Font(FontFamily.GenericSerif, 32.0f)),
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)
{
GL.Enable(EnableCap.Texture2d);
GL.Enable(EnableCap.Blend);
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
GL.ClearColor(Color.SteelBlue);
//serif.LoadGlyphs("ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz,.!?;()\'- ");
serif.LoadGlyphs("A");
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();*/
handles = new TextHandle[fonts.Length];
for (int i = handles.Length; --i >= 0; )
text.Prepare("Hello, world!", fonts[i], out handles[i]);
}
protected override void OnResize(OpenTK.Platform.ResizeEventArgs e)
{
GL.Viewport(0, 0, Width, Height);
initial_position = Height + serif.Height;
warparound_position = -(poem.Length + 1) * serif.Height;
}
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])
this.Exit();
}
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.MatrixMode(MatrixMode.Projection);
@ -102,77 +82,12 @@ namespace Examples.Tutorial
GL.MatrixMode(MatrixMode.Modelview);
GL.LoadIdentity();
GL.Translate(0.0f, scroll_position, 0.0f);
//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)
// Font size test:
for (int i = 0; i < handles.Length; i++)
{
GL.Translate(0.0f, scroll_position + serif.Height * line, 0.0f);
foreach (char c in str)
{
//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;
text.Draw(handles[i]);
GL.Translate(0, fonts[i].Height, 0);
}
*/
//GL.CallList(display_list);
SwapBuffers();
}
@ -180,13 +95,13 @@ namespace Examples.Tutorial
#region IExample Members
public static readonly int order = 6;
public void Launch()
{
Run(30.0, 0.0);
}
public static readonly int order = 6;
#endregion
}
}