/// <summary>
/// Creates an image for the given arguments.
/// </summary>
public static Image CreateImage(mxGraph graph, Object[] cells, double scale, Color? background,
bool antiAlias, mxRectangle clip, mxGdiCanvas graphicsCanvas)
{
mxImageCanvas canvas = (mxImageCanvas) DrawCells(graph, cells, scale, clip,
new ImageCanvasFactory(graphicsCanvas, background, antiAlias));
return canvas.Destroy();
}
/// <summary>
///
/// </summary>
/// <param name="canvas"></param>
/// <param name="width"></param>
/// <param name="height"></param>
/// <param name="background"></param>
/// <param name="antiAlias"></param>
public mxImageCanvas(mxGdiCanvas canvas, int width, int height,
Color? background, bool antiAlias)
{
this.canvas = canvas;
previousGraphics = canvas.Graphics;
image = mxUtils.CreateImage(width, height, background);
if (image != null)
{
Graphics g = Graphics.FromImage(image);
if (antiAlias)
{
g.SmoothingMode = SmoothingMode.HighQuality;
}
canvas.Graphics = g;
}
}
/// <summary>
/// Creates the canvas for rendering the stencil.
/// </summary>
/// <param name="gc"></param>
/// <returns></returns>
protected mxGdiCanvas2D CreateCanvas(mxGdiCanvas gc)
{
return new mxGdiCanvas2D(gc.Graphics);
}
/// <summary>
/// Paints the stencil for the given state.
/// </summary>
public void PaintShape(mxGdiCanvas gc, mxCellState state)
{
mxGdiCanvas2D canvas = CreateCanvas(gc);
Dictionary<string, object> style = state.Style;
double rotation = mxUtils.GetDouble(style, mxConstants.STYLE_ROTATION,
0);
String direction = mxUtils.GetString(style,
mxConstants.STYLE_DIRECTION, null);
// Default direction is east (ignored if rotation exists)
if (direction != null)
{
if (direction.Equals("north"))
{
rotation += 270;
}
else if (direction.Equals("west"))
{
rotation += 180;
}
else if (direction.Equals("south"))
{
rotation += 90;
}
}
// New styles for shape flipping the stencil
bool flipH = mxUtils.IsTrue(style, mxConstants.STYLE_STENCIL_FLIPH,
false);
bool flipV = mxUtils.IsTrue(style, mxConstants.STYLE_STENCIL_FLIPV,
false);
if (flipH && flipV)
{
rotation += 180;
flipH = false;
flipV = false;
}
// Saves the global state for each cell
canvas.Save();
// Adds rotation and horizontal/vertical flipping
rotation = rotation % 360;
if (rotation != 0 || flipH || flipV)
{
canvas.Rotate(rotation, flipH, flipV, state.GetCenterX(),
state.GetCenterY());
}
// Note: Overwritten in mxStencil.paintShape (can depend on aspect)
double scale = state.View.Scale;
double sw = mxUtils.GetDouble(style, mxConstants.STYLE_STROKEWIDTH, 1)
* scale;
canvas.StrokeWidth = sw;
double alpha = mxUtils.GetDouble(style, mxConstants.STYLE_OPACITY, 100) / 100;
String gradientColor = mxUtils.GetString(style,
mxConstants.STYLE_GRADIENTCOLOR, null);
// Converts colors with special keyword none to null
if (gradientColor != null && gradientColor.Equals(mxConstants.NONE))
{
gradientColor = null;
}
String fillColor = mxUtils.GetString(style,
mxConstants.STYLE_FILLCOLOR, null);
if (fillColor != null && fillColor.Equals(mxConstants.NONE))
{
fillColor = null;
}
String strokeColor = mxUtils.GetString(style,
mxConstants.STYLE_STROKECOLOR, null);
if (strokeColor != null && strokeColor.Equals(mxConstants.NONE))
{
strokeColor = null;
}
// Draws the shadow if the fillColor is not transparent
if (mxUtils.IsTrue(style, mxConstants.STYLE_SHADOW, false))
{
DrawShadow(canvas, state, rotation, flipH, flipV, state, alpha, fillColor != null);
}
canvas.Alpha = alpha;
// Sets the dashed state
if (mxUtils.IsTrue(style, mxConstants.STYLE_DASHED, false))
{
canvas.Dashed = true;
}
// Draws background and foreground
if (strokeColor != null || fillColor != null)
{
if (strokeColor != null)
{
canvas.StrokeColor = strokeColor;
}
if (fillColor != null)
{
if (gradientColor != null
&& !gradientColor.Equals("transparent"))
{
canvas.SetGradient(fillColor, gradientColor, state.X,
state.Y, state.Width, state.Height,
direction);
}
else
{
canvas.FillColor = fillColor;
}
}
// Draws background and foreground of shape
DrawShape(canvas, state, state, true);
DrawShape(canvas, state, state, false);
}
}
/// <summary>
/// Constructs a new image canvas factors.
/// </summary>
/// <param name="graphicsCanvas">Specifies the graphics canvas for painting.</param>
/// <param name="background">Specifies the background color of the image.</param>
/// <param name="antiAlias">Specifies if antialiasing should be enabled.</param>
public ImageCanvasFactory(mxGdiCanvas graphicsCanvas, Color? background, bool antiAlias)
{
this.graphicsCanvas = graphicsCanvas;
this.background = background;
this.antiAlias = antiAlias;
}
/// <summary>
/// Destroys this canvas and all allocated resources.
/// </summary>
public Image Destroy()
{
Image tmp = image;
canvas.Graphics.Dispose();
canvas.Graphics = previousGraphics;
previousGraphics = null;
canvas = null;
image = null;
return tmp;
}