/// <summary>
/// Calculates the space for the legend
/// </summary>
/// <param name="pane">The pane.</param>
/// <param name="rect">The rect.</param>
public void CalcRect(PaneBase pane, ref GLRectangleF rect)
{
if (pane is GraphPane)
{
int numLines = _legendEntries.Count / _nEntriesVert;
if (numLines * _nEntriesVert != _legendEntries.Count)
{
numLines += 1;
}
int LegendHeight = (int)(_lineHeight * numLines);
_rect.Y = pane.Rect.Y + _margin.Bottom;
_rect.X = pane.Rect.X + _margin.Left;
_rect.Height = LegendHeight;
_rect.Width = pane.Rect.Width - _margin.Left - _margin.Right;
_innerRect.Height = _rect.Height * 0.95f;
_innerRect.Width = _rect.Width * 0.98f;
_innerRect.X = _rect.X + (_rect.Width - _innerRect.Width) / 2;
_innerRect.Y = _rect.Y + (_rect.Height - _innerRect.Height) / 2;
rect.Y += LegendHeight + _margin.Top + _margin.Bottom;
rect.Height -= LegendHeight + _margin.Top + _margin.Bottom;
_entrySpaceX = (int)((_innerRect.Width - (_nEntriesVert - 1) * _entryGapX) / _nEntriesVert);
_colorLineLen = (int)(0.18f * _entrySpaceX);
_textLen = (int)(_entrySpaceX * 0.8f);
}
}
/// <summary>
/// Initializes a new instance of the <see cref="Legend"/> class.
/// </summary>
/// <param name="textInstance">The text instance.</param>
public Legend(TextInstance textInstance)
{
_legendEntries = new List <LegendEntry>();
_border = new GL_Border(Color.Black, textInstance.Shaders);
_textInstance = textInstance;
_linesShader = textInstance.Shaders.LineShader;
_rect = new GLRectangleF(0, 0, 0, 0);
_innerRect = new GLRectangleF(0, 0, 0, 0);
_entryGapX = 2;
_nEntriesVert = 5;
_margin = new Margin();
_margin.Left = 10;
_margin.Right = 10;
_margin.Top = 2;
_margin.Bottom = 5;
_lineHeight = textInstance.FontSize * 0.8;
_VBOLine = GL.GenBuffer();//set up OpenGL by generating buffers and using the shader
_VAOLine = GL.GenVertexArray();
_linesShader.Use();
GL.BindVertexArray(_VAOLine);//setting up VAO states and binding the VBO
GL.EnableVertexAttribArray(_linesShader.VertexLocation);
GL.BindBuffer(BufferTarget.ArrayBuffer, _VBOLine);
_mat = Matrix4.Identity;
GL.UniformMatrix4(_linesShader.MatrixLocation, false, ref _mat);
GL.VertexAttribPointer(_linesShader.VertexLocation, 2, VertexAttribPointerType.Float, false, 2 * sizeof(float), 0);
GL.BindVertexArray(0);
_linesShader.StopUse();
}
/// <summary>
/// Translate a point to the x/y-coordinate system of the viewport
/// </summary>
/// <param name="point">The point.</param>
/// <param name="rect">The rect.</param>
/// <returns>Gets the transformed point in the coordinatesystem of the viewport which ranges -1...1 in x and y</returns>
private PointF PointToViewport(PointF point, GLRectangleF rect)
{
PointF ViewportPoint = new PointF
{
X = 2 * (point.X - rect.X) / rect.Width - 1,
Y = 2 * (point.Y - rect.Y) / rect.Height - 1
};
return(ViewportPoint);
}
/// <summary>
/// Resizes the Rectangle, setting the posset of the first <see cref="LegendEntry"/>
/// so that the legend gets resized after this happens
/// </summary>
/// <param name="rect">The rect.</param>
public virtual void ReSize(GLRectangleF rect)
{
_rect = rect;
try
{
_legend[0].PosSet = false;
}
catch
{
}
}
/// <summary>
/// Calculates the client rect.
/// </summary>
/// <returns>a rectangle reduced by the <see cref="Margin"/> values</returns>
public GLRectangleF CalcClientRect()
{
GLRectangleF innerRect = new GLRectangleF(
_rect.X + _margin.Left,
_rect.Y + _margin.Bottom,
_rect.Width - (_margin.Left + _margin.Right),
_rect.Height - (_margin.Top + _margin.Bottom));
this._legend.CalcRect(this, ref innerRect);
return(innerRect);
}
/// <summary>
/// Draws the Border to the specified rectangle
/// </summary>
/// <param name="rect">The rect.</param>
public void Draw(GLRectangleF rect)
{
GL.Viewport((int)rect.X, (int)rect.Y, (int)rect.Width, (int)rect.Height);
_shaders.LineShader.Use();
GL.BindVertexArray(_VAO);
GL.Uniform4(_shaders.LineShader.ColorLocation, _color);
GL.UniformMatrix4(_shaders.LineShader.MatrixLocation, false, ref _mat);
GL.DrawArrays(PrimitiveType.LineLoop, 0, _border.Length / 2);
GL.BindVertexArray(0);
_shaders.LineShader.StopUse();
}
/// <summary>
/// Initializes a new instance of the <see cref="PaneBase"/> class.
/// </summary>
/// <param name="paneRect">The pane rect.</param>
/// <param name="textInstance">The text instance.</param>
public PaneBase(RectangleF paneRect, TextInstance textInstance)
{
_rect = new GLRectangleF(0, 0, 0, 0);
_rect.X = (int)paneRect.X;
_rect.Height = (int)paneRect.Height;
_rect.Width = (int)paneRect.Width;
_rect.Y = (int)paneRect.Bottom;
_margin = new Margin();
_glBorder = new GL_Border(Color.Black, textInstance.Shaders);
_legend = new Legend(textInstance);
}
/// <summary>
/// Calculates the chart rect.
/// </summary>
/// <returns>The rectangle where the <see cref="CurveList"/> can be drawn.
/// It gets smaller the more axes and the more Legend entries exist.</returns>
public GLRectangleF CalcChartRect()
{
// chart rect starts out at the full pane rect less the margins
// and less space for the Pane title
int minSpaceL = 0;
GLRectangleF clientRect = this.CalcClientRect();
_xAxis.CalcSpace(out int minSpaceB);
foreach (Axis axis in _yAxisList)
{
int tmp = axis.CalcSpace(out int fixedSpace);
minSpaceL += fixedSpace;
}
clientRect.X += minSpaceL;
clientRect.Y += minSpaceB;
clientRect.Height -= minSpaceB;
clientRect.Width -= minSpaceL;
return(clientRect);
}
/// <summary>
/// Draws the pane frame.
/// </summary>
public void DrawPaneFrame()
{
GLRectangleF rect = new GLRectangleF(_rect.X, _rect.Y, _rect.Width - 1, _rect.Height - 1);
_glBorder.Draw(rect);
}
/// <summary>
/// Generates the font image, the VAO and the <see cref="CharSheet"/> storing all <see cref="Character"/>
/// </summary>
/// <param name="rect">The rect.</param>
public void GenerateFontImage(GLRectangleF rect)
{
int bitmapWidth = _glyphsPerLine * _glyphWidth; //calculate bitmap dimensions
int bitmapHeight = _glyphLineCount * _glyphHeight;
//generating the bitmap and setting it up first
using (Bitmap bitmap = new Bitmap(bitmapWidth, bitmapHeight, System.Drawing.Imaging.PixelFormat.Format32bppArgb))
{
Font font;
font = new Font(new FontFamily(_fontName), _fontSize, FontStyle.Regular, GraphicsUnit.Pixel);
using (var g = Graphics.FromImage(bitmap))
{
if (_bitmapFont)
{
g.SmoothingMode = SmoothingMode.None;
g.TextRenderingHint = TextRenderingHint.SingleBitPerPixel;
}
else
{
g.SmoothingMode = SmoothingMode.HighQuality;
g.TextRenderingHint = TextRenderingHint.AntiAliasGridFit;
}
//draw each character onto the bitmap
for (int p = 0; p < _glyphLineCount; p++)
{
for (int n = 0; n < _glyphsPerLine; n++)
{
char c = (char)(n + p * _glyphsPerLine);
g.DrawString(c.ToString(), font, Brushes.Black,
n * _glyphWidth + _atlasOffsetX, p * _glyphHeight + _atlasOffsetY);
}
}
}
bitmap.Save(_fontBitmapFilename);//save the bitmap
_textureWidth = bitmap.Width; _textureHeight = bitmap.Height;
}
_shaders.TextShader.Use();
//bind the bitmap to an OpenGL Texture
_fontTextureID = GL.GenTexture();
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, _fontTextureID);
using (var image = new Bitmap(_fontBitmapFilename))
{//load the bitmap into OpenGL
var data = image.LockBits(
new Rectangle(0, 0, image.Width, image.Height),
ImageLockMode.ReadOnly,
System.Drawing.Imaging.PixelFormat.Format32bppArgb);
GL.TexImage2D(TextureTarget.Texture2D,
0,
PixelInternalFormat.Rgba,
image.Width,
image.Height,
0,
OpenTK.Graphics.OpenGL4.PixelFormat.Bgra,
PixelType.UnsignedByte,
data.Scan0);
}
//set up the filters for the bitmap
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMinFilter, (int)TextureMinFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureMagFilter, (int)TextureMagFilter.Linear);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapS, (int)TextureWrapMode.Repeat);
GL.TexParameter(TextureTarget.Texture2D, TextureParameterName.TextureWrapT, (int)TextureWrapMode.Repeat);
//generate the VAO and bind it
_VAO = GL.GenVertexArray();
GL.BindVertexArray(_VAO);
//enable the vertex attribute arrays, very important otherwise no vertix can be loaded into OpenGL
GL.EnableVertexAttribArray(_shaders.TextShader.TexCoordLocation);
GL.EnableVertexAttribArray(_shaders.TextShader.VertexLocation);
//generate the CharSheet from the information about the bitmap
_charSheet = new CharSheet(_glyphLineCount, _glyphsPerLine, _glyphHeight, _glyphWidth, _textureWidth, _textureHeight, rect);
//set the attribpointers to tell the Shader how the Vertices will be passed.
GL.VertexAttribPointer(_shaders.TextShader.VertexLocation, 2, VertexAttribPointerType.Float, false, 4 * sizeof(float), 0);
GL.ActiveTexture(TextureUnit.Texture0);
GL.BindTexture(TextureTarget.Texture2D, _fontTextureID);
GL.VertexAttribPointer(_shaders.TextShader.TexCoordLocation, 2, VertexAttribPointerType.Float, false, 4 * sizeof(float), 2 * sizeof(float));
GL.BindVertexArray(0);
_shaders.TextShader.StopUse();
GL.Enable(EnableCap.Blend);//enable blending for the bitmap
GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
}
public CharSheet(int GlyphLineCount, int GlyphsPerLine, int GlyphHeight, int GlyphWidth, int TextureWidth, int TextureHeight, GLRectangleF rect)
{
for (int p = 0; p < GlyphLineCount; p++)
{
for (int n = 0; n < GlyphsPerLine; n++)
{
Character character = new Character((char)(n + p * GlyphsPerLine), GlyphHeight, GlyphWidth, TextureWidth, TextureHeight, GlyphsPerLine, rect);
this.Add(character);
}
}
}
/// <summary>
/// Initializes a new instance of the <see cref="Character"/> class.
/// It combines the Coordinates of the bitmap containing the font
/// with the Coordinates of the screen
/// </summary>
/// <param name="character">The character.</param>
/// <param name="GlyphHeight">Height of the glyph.</param>
/// <param name="GlyphWidth">Width of the glyph.</param>
/// <param name="TextureWidth">Width of the texture.</param>
/// <param name="TextureHeight">Height of the texture.</param>
/// <param name="GlyphsPerLine">The glyphs per line.</param>
/// <param name="rect">The rect.</param>
public Character(char character, int GlyphHeight, int GlyphWidth, int TextureWidth, int TextureHeight, int GlyphsPerLine, GLRectangleF rect)
{
_char = character; //store the char for referencing
float u_step = (float)GlyphWidth / (float)TextureWidth; //step sizes for stepping throught the bitmap
float v_step = (float)GlyphHeight / (float)TextureHeight;
float u = (float)(character % GlyphsPerLine) * u_step; //Starting positions of the character inside the bitmap
float v = (float)(character / GlyphsPerLine) * v_step;
float x = -GlyphWidth / 2, y = 0; //Screen coordinates, specifying the bottom mit point of the glyph
_vertices = new float[] { //setting the vertices
x / rect.Width, y / rect.Height, u, v,
-x / rect.Width, y / rect.Height, u + u_step, v,
-x / rect.Width, -GlyphHeight / rect.Height, u + u_step, v + v_step,
x / rect.Width, y / rect.Height, u, v,
-x / rect.Width, -GlyphHeight / rect.Height, u + u_step, v + v_step,
x / rect.Width, -GlyphHeight / rect.Height, u, v + v_step
};
_VBO = GL.GenBuffer();//generate the VBO, binding it and putting the Vertices inside.
GL.BindBuffer(BufferTarget.ArrayBuffer, _VBO);
GL.BufferData <float>(BufferTarget.ArrayBuffer, (IntPtr)(sizeof(float) * _vertices.Length), _vertices, BufferUsageHint.DynamicDraw);
}