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GUILayer.cs
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GUILayer.cs
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using System;
using System.Collections.Generic;
using System.Drawing;
using System.Windows.Forms;
using OpenTK;
using OpenTK.Input;
using OpenTK.Graphics.OpenGL;
namespace LasView {
public enum GUIObjectType {
None,
Label,
Frame,
Button,
Texture,
UserDrawn
}
public enum Layer {
Layer0,
Layer1,
Layer2,
Layer3
}
public delegate void ClickedDelegate(int x, int y, MouseButton button);
public delegate void DrawDelegate(Rectangle bounds, Geometry screenQuad);
public class GUILayer : IDisposable {
public static Font DefaultFont = new Font("Arial", 10.0f);
private Texture canvas = null;
private Geometry fullScreenQuad = null;
private Dictionary<string, GUIObject> objects = new Dictionary<string, GUIObject>();
private Matrix4 orthoMatrix = Matrix4.Identity;
private bool isDirty = true;
public GUILayer(Viewport view) {
ResizeView(view);
fullScreenQuad = new Geometry(BeginMode.Quads,
new VertexBuffer(new Vertex[] {
new Vertex() {X = 0, Y = 0, Z = 0},
new Vertex() {X = 0, Y = view.Height, Z = 0},
new Vertex() {X = view.Width, Y = view.Height, Z = 0},
new Vertex() {X = view.Width, Y = 0, Z = 0}
}, new TexCoord[] {
new TexCoord() {U = 0, V = 1.0f},
new TexCoord() {U = 0, V = 0},
new TexCoord() {U = 1.0f, V = 0},
new TexCoord() {U = 1.0f, V = 1.0f}
}));
}
public void AddLabel(string name, string text, Font font, int x, int y, Layer layer, Color color) {
objects.Add(name,
new GUIObject() {
Name = name,
Text = text,
Font = font,
ForeColor = color,
Location = new Point(x, y),
Layer = layer,
Type = GUIObjectType.Label
});
}
public void AddLabel(string name, string text, int x, int y, Layer layer, Color color) {
AddLabel(name, text, DefaultFont, x, y, layer, color);
}
public void AddFrame(string name, int x, int y, int width, int height, Layer layer, Color color) {
objects.Add(name, new GUIObject() {
Name = name,
ForeColor = color,
Location = new Point(x, y),
Size = new Size(width, height),
Layer = layer,
Type = GUIObjectType.Frame
});
}
public void AddTexture(string name, int x, int y, int width, int height, Layer layer, Texture tex) {
objects.Add(name, new GUIObject() {
Name = name,
Location = new Point(x, y),
Size = new Size(width, height),
Layer = layer,
UserData = tex,
Type = GUIObjectType.Texture
});
}
public void AddUserObject(string name, int x, int y, int width, int height, DrawDelegate drawFunc) {
objects.Add(name, new GUIObject() {
Name = name,
Location = new Point(x, y),
Size = new Size(width, height),
UserData = drawFunc,
Type = GUIObjectType.UserDrawn
});
}
public void Refresh() {
isDirty = true;
}
public bool UpdateObjectText(string name, string newText) {
if (objects.ContainsKey(name)) {
objects[name].Text = newText;
isDirty = true;
return true;
}
return false;
}
public void ResizeView(Viewport newView) {
orthoMatrix = Matrix4.CreateOrthographicOffCenter(
0, newView.Width, newView.Height, 0, -100, 100);
if (canvas != null) {
canvas.Dispose();
}
using (Bitmap blankBitmap = new Bitmap(newView.Width, newView.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb)) {
canvas = new Texture(blankBitmap, true);
}
if (fullScreenQuad != null) {
fullScreenQuad.Dispose();
}
fullScreenQuad = new Geometry(BeginMode.Quads,
new VertexBuffer(new Vertex[] {
new Vertex() {X = 0, Y = 0, Z = 0, S = 0, T = 1.0f},
new Vertex() {X = 0, Y = newView.Height, Z = 0, S = 0, T = 0},
new Vertex() {X = newView.Width, Y = newView.Height, Z = 0, S = 1.0f, T = 0},
new Vertex() {X = newView.Width, Y = 0, Z = 0, S = 1.0f, T = 1.0f}
}, new ushort[] {
0, 1, 2, 3
}));
isDirty = true;
}
public void Update(int mouseX, int mouseY, MouseButton buttons) {
foreach (KeyValuePair<string, GUIObject> kvp in objects) {
switch (kvp.Value.Type) {
case GUIObjectType.Button:
if (kvp.Value.OnClick != null) {
kvp.Value.OnClick(mouseX, mouseY, buttons);
}
break;
}
}
}
public void Draw() {
// load ortho projection
GL.MatrixMode(MatrixMode.Projection);
GL.PushMatrix();
GL.LoadMatrix(ref orthoMatrix);
GL.PushAttrib(AttribMask.CurrentBit | AttribMask.DepthBufferBit | AttribMask.LightingBit);
GL.MatrixMode(MatrixMode.Modelview);
GL.PushMatrix();
{
GL.Disable(EnableCap.Lighting);
GL.LoadIdentity();
GL.Disable(EnableCap.DepthTest);
if (isDirty) {
UpdateTexture();
}
// draw user objects
foreach (KeyValuePair<string, GUIObject> kvp in objects) {
if (kvp.Value.Type == GUIObjectType.UserDrawn) {
DrawDelegate func = (DrawDelegate)kvp.Value.UserData;
if (func != null) {
func(new Rectangle(
kvp.Value.Location.X, kvp.Value.Location.Y,
kvp.Value.Size.Width, kvp.Value.Size.Height),
fullScreenQuad);
}
}
}
canvas.Bind();
fullScreenQuad.Position = new Vector3(0, 0, -1.0f);
fullScreenQuad.Draw();
fullScreenQuad.Position = new Vector3(0, 0, 0);
canvas.Unbind();
}
GL.PopMatrix();
GL.PopAttrib();
// pop ortho projection and set mode back to modelview
GL.MatrixMode(MatrixMode.Projection);
GL.PopMatrix();
GL.MatrixMode(MatrixMode.Modelview);
}
private void UpdateTexture() {
using (Graphics graphics = canvas.GetImageContext()) {
graphics.Clear(Color.FromArgb(0, 0, 0, 0));
graphics.TextRenderingHint = System.Drawing.Text.TextRenderingHint.AntiAliasGridFit;
graphics.ResetTransform();
graphics.ScaleTransform(1.0f, -1.0f);
List<KeyValuePair<string, GUIObject>> guiObjects =
new List<KeyValuePair<string, GUIObject>>(objects);
guiObjects.Sort(new Comparison<KeyValuePair<string, GUIObject>>(
delegate(KeyValuePair<string, GUIObject> obj1, KeyValuePair<string, GUIObject> obj2) {
return (obj1.Value.Layer < obj2.Value.Layer) ? -1 :
(obj1.Value.Layer == obj2.Value.Layer ? 0 : 1);
}));
foreach (KeyValuePair<string, GUIObject> kvp in guiObjects) {
switch (kvp.Value.Type) {
case GUIObjectType.Label:
DrawLabel(graphics, kvp.Value);
break;
case GUIObjectType.Frame:
DrawFrame(graphics, kvp.Value);
break;
case GUIObjectType.Button:
DrawButton(graphics, kvp.Value);
break;
case GUIObjectType.Texture:
DrawTexture(graphics, kvp.Value);
break;
}
}
}
canvas.RefreshTexture();
isDirty = false;
}
private void DrawLabel(Graphics g, GUIObject obj) {
using (SolidBrush brush = new SolidBrush(obj.ForeColor)) {
g.DrawString(obj.Text, obj.Font, Brushes.Black, new PointF(obj.Location.X + 1, obj.Location.Y - canvas.Height + 1));
g.DrawString(obj.Text, obj.Font, brush, new PointF(obj.Location.X, obj.Location.Y - canvas.Height));
}
}
private void DrawFrame(Graphics g, GUIObject obj) {
using (SolidBrush brush = new SolidBrush(obj.ForeColor)) {
g.FillRectangle(brush, obj.Location.X, obj.Location.Y - canvas.Height, obj.Size.Width, obj.Size.Height);
}
}
private void DrawButton(Graphics g, GUIObject obj) {
using (SolidBrush brush = new SolidBrush(obj.ForeColor)) {
g.FillRectangle(brush, obj.Location.X, obj.Location.Y - canvas.Height, obj.Size.Width, obj.Size.Height);
}
}
private void DrawTexture(Graphics g, GUIObject obj) {
Texture tex = obj.UserData as Texture;
if (tex != null && tex.IsDynamic) {
Bitmap b = tex.GetImageData();
g.DrawImage(b, obj.Location.X, obj.Location.Y, obj.Size.Width, obj.Size.Height);
}
}
private class GUIObject {
public string Text { get; set; }
public string Name { get; set; }
public Font Font { get; set; }
public Layer Layer { get; set; }
public Color ForeColor { get; set; }
public Point Location { get; set; }
public Size Size { get; set; }
public GUIObjectType Type { get; set; }
public ClickedDelegate OnClick { get; set; }
public object UserData { get; set; }
}
public void Dispose() {
canvas.Dispose();
fullScreenQuad.Dispose();
}
}
}