internal static void DrawGrid(Graphics graphics, Rectangle viewableRectangle)
{
AmbientTheme ambientTheme = WorkflowTheme.CurrentTheme.AmbientTheme;
if (ambientTheme.GridStyle == DashStyle.Dot)
{
Point gridStart = Point.Empty;
gridStart.X = viewableRectangle.X - (viewableRectangle.X % ambientTheme.GridSize.Width);
gridStart.Y = viewableRectangle.Y - (viewableRectangle.Y % ambientTheme.GridSize.Height);
for (int gridCoOrdX = gridStart.X; gridCoOrdX <= viewableRectangle.Right; gridCoOrdX += Math.Max(ambientTheme.GridSize.Width, 1))
{
for (int gridCoOrdY = gridStart.Y; gridCoOrdY <= viewableRectangle.Bottom; gridCoOrdY += Math.Max(ambientTheme.GridSize.Height, 1))
{
graphics.FillRectangle(ambientTheme.MajorGridBrush, new Rectangle(new Point(gridCoOrdX, gridCoOrdY), new Size(1, 1)));
if (((gridCoOrdX + ambientTheme.GridSize.Width / 2) >= viewableRectangle.Left && (gridCoOrdX + ambientTheme.GridSize.Width / 2) <= viewableRectangle.Right) &&
((gridCoOrdY + ambientTheme.GridSize.Height / 2) >= viewableRectangle.Top && (gridCoOrdY + ambientTheme.GridSize.Height / 2) <= viewableRectangle.Bottom))
graphics.FillRectangle(ambientTheme.MinorGridBrush, new Rectangle(new Point(gridCoOrdX + ambientTheme.GridSize.Width / 2, gridCoOrdY + ambientTheme.GridSize.Height / 2), new Size(1, 1)));
}
}
}
else
{
//We use native pens to draw the grid for efficiency reason
using (Hdc hdc = new Hdc(graphics))
using (HPen majorGridPen = new HPen(ambientTheme.MajorGridPen))
using (HPen minorGridPen = new HPen(ambientTheme.MinorGridPen))
{
hdc.DrawGrid(majorGridPen, minorGridPen, viewableRectangle, ambientTheme.GridSize, true);
}
}
}
internal static void DrawGrid(Graphics graphics, Rectangle viewableRectangle)
{
AmbientTheme ambientTheme = WorkflowTheme.CurrentTheme.AmbientTheme;
if (ambientTheme.GridStyle == DashStyle.Dot)
{
Point empty = Point.Empty;
empty.X = viewableRectangle.X - (viewableRectangle.X % ambientTheme.GridSize.Width);
empty.Y = viewableRectangle.Y - (viewableRectangle.Y % ambientTheme.GridSize.Height);
for (int i = empty.X; i <= viewableRectangle.Right; i += Math.Max(ambientTheme.GridSize.Width, 1))
{
for (int j = empty.Y; j <= viewableRectangle.Bottom; j += Math.Max(ambientTheme.GridSize.Height, 1))
{
graphics.FillRectangle(ambientTheme.MajorGridBrush, new Rectangle(new Point(i, j), new Size(1, 1)));
if ((((i + (ambientTheme.GridSize.Width / 2)) >= viewableRectangle.Left) && ((i + (ambientTheme.GridSize.Width / 2)) <= viewableRectangle.Right)) && (((j + (ambientTheme.GridSize.Height / 2)) >= viewableRectangle.Top) && ((j + (ambientTheme.GridSize.Height / 2)) <= viewableRectangle.Bottom)))
{
graphics.FillRectangle(ambientTheme.MinorGridBrush, new Rectangle(new Point(i + (ambientTheme.GridSize.Width / 2), j + (ambientTheme.GridSize.Height / 2)), new Size(1, 1)));
}
}
}
}
else
{
using (Hdc hdc = new Hdc(graphics))
{
using (HPen pen = new HPen(ambientTheme.MajorGridPen))
{
using (HPen pen2 = new HPen(ambientTheme.MinorGridPen))
{
hdc.DrawGrid(pen, pen2, viewableRectangle, ambientTheme.GridSize, true);
}
}
}
}
}
//internal void DrawLines(HPen pen, Point[] points)
//{
// try
// {
// IntPtr objectPtr = NativeMethods.SelectObject(this.hdc, pen.Handle);
// if (objectPtr == IntPtr.Zero)
// throw new Win32Exception(Marshal.GetLastWin32Error());
// if (!NativeMethods.MoveToEx(this.hdc, points[0].X, points[0].Y, null))
// throw new Win32Exception(Marshal.GetLastWin32Error());
// for (int i = 0; i < points.Length - 1; i++)
// {
// if (!NativeMethods.LineTo(this.hdc, points[i + 1].X, points[i + 1].Y))
// throw new Win32Exception(Marshal.GetLastWin32Error());
// }
// }
// finally
// {
// IntPtr objectPtr = NativeMethods.SelectObject(this.hdc, this.oldPen);
// if (objectPtr == IntPtr.Zero)
// throw new Win32Exception(Marshal.GetLastWin32Error());
// }
//}
internal void DrawGrid(HPen majorGridPen, HPen minorGridPen, Rectangle viewableRectangle, Size gridUnit, bool showMinorGrid)
{
try
{
Point gridStart = Point.Empty;
gridStart.X = viewableRectangle.X - (viewableRectangle.X % gridUnit.Width);
gridStart.Y = viewableRectangle.Y - (viewableRectangle.Y % gridUnit.Height);
IntPtr objectPtr = NativeMethods.SelectObject(this.hdc, majorGridPen.Handle);
if (objectPtr == IntPtr.Zero)
throw new Win32Exception(Marshal.GetLastWin32Error());
for (int gridCoOrd = gridStart.X; gridCoOrd <= viewableRectangle.Right; gridCoOrd += Math.Max(gridUnit.Width, 1))
{
if (gridCoOrd >= viewableRectangle.Left)
{
if (!NativeMethods.MoveToEx(this.hdc, gridCoOrd, viewableRectangle.Top + 1, null))
throw new Win32Exception(Marshal.GetLastWin32Error());
if (!NativeMethods.LineTo(this.hdc, gridCoOrd, viewableRectangle.Bottom - 1))
throw new Win32Exception(Marshal.GetLastWin32Error());
}
if (showMinorGrid && (gridCoOrd + gridUnit.Width / 2) >= viewableRectangle.Left && (gridCoOrd + gridUnit.Width / 2) <= viewableRectangle.Right)
{
objectPtr = NativeMethods.SelectObject(this.hdc, minorGridPen.Handle);
if (objectPtr == IntPtr.Zero)
throw new Win32Exception(Marshal.GetLastWin32Error());
if (!NativeMethods.MoveToEx(this.hdc, gridCoOrd + gridUnit.Width / 2, viewableRectangle.Top + 1, null))
throw new Win32Exception(Marshal.GetLastWin32Error());
if (!NativeMethods.LineTo(this.hdc, gridCoOrd + gridUnit.Width / 2, viewableRectangle.Bottom - 1))
throw new Win32Exception(Marshal.GetLastWin32Error());
objectPtr = NativeMethods.SelectObject(this.hdc, majorGridPen.Handle);
if (objectPtr == IntPtr.Zero)
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
for (int gridCoOrd = gridStart.Y; gridCoOrd <= viewableRectangle.Bottom; gridCoOrd += Math.Max(gridUnit.Height, 1))
{
if (gridCoOrd >= viewableRectangle.Top)
{
if (!NativeMethods.MoveToEx(this.hdc, viewableRectangle.Left + 1, gridCoOrd, null))
throw new Win32Exception(Marshal.GetLastWin32Error());
if (!NativeMethods.LineTo(this.hdc, viewableRectangle.Right - 1, gridCoOrd))
throw new Win32Exception(Marshal.GetLastWin32Error());
}
if (showMinorGrid && (gridCoOrd + gridUnit.Height / 2) >= viewableRectangle.Top && (gridCoOrd + gridUnit.Height / 2) <= viewableRectangle.Bottom)
{
objectPtr = NativeMethods.SelectObject(this.hdc, minorGridPen.Handle);
if (objectPtr == IntPtr.Zero)
throw new Win32Exception(Marshal.GetLastWin32Error());
if (!NativeMethods.MoveToEx(this.hdc, viewableRectangle.Left + 1, gridCoOrd + gridUnit.Height / 2, null))
throw new Win32Exception(Marshal.GetLastWin32Error());
if (!NativeMethods.LineTo(this.hdc, viewableRectangle.Right - 1, gridCoOrd + gridUnit.Height / 2))
throw new Win32Exception(Marshal.GetLastWin32Error());
objectPtr = NativeMethods.SelectObject(this.hdc, majorGridPen.Handle);
if (objectPtr == IntPtr.Zero)
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
}
finally
{
IntPtr objectPtr = NativeMethods.SelectObject(this.hdc, this.oldPen);
if (objectPtr == IntPtr.Zero)
throw new Win32Exception(Marshal.GetLastWin32Error());
}
}
