/// <summary>
/// Constructs a new object that represents the current state of the given
/// cell in the specified view.
/// </summary>
/// <param name="view">Graph view that contains the state.</param>
/// <param name="cell">Cell that this state represents.</param>
/// <param name="style">Array of key, value pairs that constitute the style.</param>
public mxCellState(mxGraphView view, Object cell, Dictionary <string, Object> style)
{
View = view;
Cell = cell;
Style = style;
}
/// <summary>
/// Constructs a new object that represents the current state of the given
/// cell in the specified view.
/// </summary>
/// <param name="view">Graph view that contains the state.</param>
/// <param name="cell">Cell that this state represents.</param>
/// <param name="style">Array of key, value pairs that constitute the style.</param>
public mxCellState(mxGraphView view, Object cell, Dictionary<string, Object> style)
{
View = view;
Cell = cell;
Style = style;
}
/// <summary>
/// Draws the given cells using a Graphics2D canvas and returns the buffered image
/// that represents the cells.
/// </summary>
public static mxICanvas DrawCells(mxGraph graph, Object[] cells, double scale,
mxRectangle clip, CanvasFactory factory)
{
mxICanvas canvas = null;
if (cells == null)
{
cells = new Object[] { graph.Model.Root };
}
if (cells != null)
{
// Gets the current state of the view
mxGraphView view = graph.View;
Dictionary <Object, mxCellState> states = view.States;
double oldScale = view.Scale;
// Keeps the existing translation as the cells might
// be aligned to the grid in a different way in a graph
// that has a translation other than zero
bool eventsEnabled = view.IsEventsEnabled;
// Disables firing of scale events so that there is no
// repaint or update of the original graph
view.IsEventsEnabled = false;
try
{
// TODO: Factor-out into mxTemporaryCellStates class
view.States = new Dictionary <Object, mxCellState>();
view.Scale = scale;
// Creates virtual parent state for validation
mxCellState state = view.CreateState(new mxCell());
// Validates the vertices and edges without adding them to
// the model so that the original cells are not modified
for (int i = 0; i < cells.Length; i++)
{
view.ValidateBounds(state, cells[i]);
}
for (int i = 0; i < cells.Length; i++)
{
view.ValidatePoints(state, cells[i]);
}
if (clip == null)
{
clip = graph.GetPaintBounds(cells);
}
if (clip != null && clip.Width > 0 && clip.Height > 0)
{
Rectangle rect = clip.GetRectangle();
canvas = factory.CreateCanvas(rect.Width + 1,
rect.Height + 1);
if (canvas != null)
{
double previousScale = canvas.Scale;
Point previousTranslate = canvas.Translate;
try
{
canvas.Translate = new Point(-rect.X, -rect.Y);
canvas.Scale = view.Scale;
for (int i = 0; i < cells.Length; i++)
{
graph.DrawCell(canvas, cells[i]);
}
}
finally
{
canvas.Scale = previousScale;
canvas.Translate = previousTranslate;
}
}
}
}
finally
{
view.Scale = oldScale;
view.States = states;
view.IsEventsEnabled = eventsEnabled;
}
}
return(canvas);
}