private void DrawGrid(DrawingContext drawingContext)
{
double bottom = this.ActualHeight;
Rect r = new Rect(0, 0, this.ActualWidth, bottom);
ulong firstVisibleTick;
ulong lastVisibleTick;
ulong tickInterval;
this.TimeAxis.GetTickInfo(out firstVisibleTick, out lastVisibleTick, out tickInterval);
if (tickInterval == 0)
{
return;
}
double yFirstTic = 0;
double yTicInterval = 1;
double yMax = 100;
if (this.SideBar != null)
{
this.SideBar.GetTickInfo(out yFirstTic, out yTicInterval, out yMax);
}
// Draw all tween grid lines before major grid lines
if (xShowTween)
{
for (ulong x = firstVisibleTick + tickInterval / 2; x <= lastVisibleTick; x += tickInterval)
{
double tx = Math.Floor(TimeAxis.TimeToScreen(x)) + 0.5;
drawingContext.DrawLine(gridPen, new Point(tx, r.Top), new Point(tx, r.Bottom));
}
}
if (yShowTween)
{
for (double y = yFirstTic + yTicInterval / 2; y < yMax; y += yTicInterval)
{
double ty = Math.Floor((bottom - 1) - SideBar.YToPixels(y)) + 0.5;
drawingContext.DrawLine(gridPen, new Point(0, ty), new Point(this.ActualWidth, ty));
}
}
// Draw major grid lines
for (ulong x = firstVisibleTick; x <= lastVisibleTick; x += tickInterval)
{
double tx = Math.Floor(TimeAxis.TimeToScreen(x)) + 0.5;
drawingContext.DrawLine(gridPen, new Point(tx, r.Top), new Point(tx, r.Bottom));
}
if (this.SideBar != null)
{
for (double y = yFirstTic; y < yMax; y += yTicInterval)
{
double ty = Math.Floor((bottom - 1) - SideBar.YToPixels(y)) + 0.5;
drawingContext.DrawLine(gridPen, new Point(0, ty), new Point(this.ActualWidth, ty));
}
}
}