/// <summary>
/// This method is called when rendering is required.
/// </summary>
/// <param name="drawingContext"></param>
protected override void OnRender(DrawingContext drawingContext)
{
if (!Initializing)
{
// Update the CAmera position
persptCamera.LookDirection = cameraLookDirection;
persptCamera.Position = cameraPosition;
// If the user's mouse is on one of the 3D bar. then enhance the bar and display its values.
if (null != SelectedHit &&
(PrevSelectedHit == null ||
0 != PrevSelectedHit.StringToDisplay.CompareTo(SelectedHit.StringToDisplay)))
{
if (geometryForHitText != null)
{
geometryForHitText = null;
modelForHitText.Content = null;
mainViewPort.Children.Remove(modelForHitText);
}
if (modelsForHitTest != null)
{
List<ModelVisual3D>.Enumerator enumModelsI = modelsForHitTest.GetEnumerator();
while (enumModelsI.MoveNext())
{
mainViewPort.Children.Remove(enumModelsI.Current);
}
}
LetterLengthForHitText = SelectedHit.StringToDisplay.Length * OneLetterWidthForHitText;
Point3D ptToWRite = SelectedHit.P2;
ptToWRite.Y += LITTLE_ABOVE;
geometryForHitText = WriteText(SelectedHit.PointToWrite, LetterLengthForHitText, OneLetterHeightForHitText, SelectedHit.StringToDisplay, Colors.Black);
modelsForHitTest = Draw3DBar(SelectedHit.XItem, SelectedHit.YItem, SelectedHit.ZItem, SelectedHit.PointToStart, SelectedHit.Height, SelectedHit.Width , SelectedHit.BarColor);
List<ModelVisual3D>.Enumerator enumModels = modelsForHitTest.GetEnumerator();
while (enumModels.MoveNext())
{
mainViewPort.Children.Add(enumModels.Current);
}
PrevSelectedHit = SelectedHit;
modelForHitText.Content = geometryForHitText;
mainViewPort.Children.Add(modelForHitText);
}
// Else if there is no bar selected remove the enhancement and Hit text.
else if (null == SelectedHit)
{
geometryForHitText = null;
modelForHitText.Content = null;
mainViewPort.Children.Remove(modelForHitText);
if (modelsForHitTest != null)
{
List<ModelVisual3D>.Enumerator enumModels = modelsForHitTest.GetEnumerator();
while (enumModels.MoveNext())
{
mainViewPort.Children.Remove(enumModels.Current);
}
}
}
}
base.OnRender(drawingContext);
}
/// <summary>
/// This method is called during initialization to create the 3D Bar chart and then its called to update
/// </summary>
private void Initialize()
{
if (chartSize.Height == 0 || chartSize.Width == 0) return;
Initializing = true;
cameraDistance = 160 + 5 * ZItems.Length + 140 / XItems.Length;
// We clear the 3D drawings, if any previously added
mainViewPort.Children.Clear();
if (HideChart == true) return;
mainViewPort.Children.Add(lightModelVisual);
listOfHitPoints.Clear();
this.InvalidateVisual();
List<ModelVisual3D> retValue;
List<ModelVisual3D>.Enumerator enumList;
SelectedHit = null;
modelForHitText = new ModelVisual3D();
OneLetterWidthForHitText = 1.1;
OneLetterHeightForHitText = 1.7;
PointToWrite0 = new Point3D();
PointToWrite1 = new Point3D();
PointToWrite2 = new Point3D();
PointToWrite3 = new Point3D();
yPlane2DPoint0 = new Point(0, 1);
yPlane2DPoint1 = new Point(1, 1);
yPlane2DPoint2 = new Point(1, 0);
yPlane2DPoint3 = new Point(0, 0);
// We draw 3D cart here.
retValue = Draw3DChart(XItems, YItems, ZItems, Colors.Yellow, Colors.Cyan, ZPlaneColors, chartSize.Width/(XItems.Length * 2.2 * 10));
enumList = retValue.GetEnumerator();
// Add the resultant geometry to the main viewport.
while (enumList.MoveNext())
{
mainViewPort.Children.Add(enumList.Current);
}
retValue.Clear();
// Compute the camera position.
ComputeCameraPosition();
Initializing = false;
// Display the graph
this.InvalidateVisual();
}
/// <summary>
/// This method is called when the mouse is moved.
/// </summary>
/// <param name="sender"></param>
/// <param name="me"></param>
private void OnMouseMove(object sender, MouseEventArgs me)
{
if (me.LeftButton == MouseButtonState.Pressed && leftButtonDown == true)
{
// If the left mouse button is pressed, then we calculate the Camera position,
// then invalidate the current drawing for a redraw
me.MouseDevice.SetCursor(Cursors.ScrollAll);
Point retPoint = me.GetPosition(pThis);
double MouseX = retPoint.X;
double MouseY = retPoint.Y;
if (MouseX == MouseXFirstDown && MouseY == MouseYFirstDown)
{
return;
}
// To calculate how much the mouse moved X position
if (MouseXFirstDown != MouseX)
{
XAngle += (MouseX - MouseXFirstDown) / MouseSens;
MouseXFirstDown = MouseX;
}
// To calculate how much the mouse mofed Y position
if (MouseYFirstDown != MouseY)
{
YAngle += (MouseY - MouseYFirstDown) / MouseSens;
MouseYFirstDown = MouseY;
}
//ZCameraPosition = -2.5 + (-1) * cameraDistance * Math.Cos(XAngle * 3.141 / 180.0) * Math.Sin(YAngle * 3.141 / 180.0);
//XCameraPosition = 2.5 + cameraDistance * Math.Sin(XAngle * 3.141 / 180.0) * Math.Sin(YAngle * 3.141 / 180.0);
//YCameraPosition = 2.5 + cameraDistance * Math.Cos(YAngle * 3.141 / 180.0);
ComputeCameraPosition();
SelectedHit = null;
}
else
{
Point pt = me.GetPosition((UIElement)sender);
HitTestResult result = VisualTreeHelper.HitTest(mainGrid, pt);
// If there is a hit, then draw the bar slightly bigger and display the Hit text
// (as we stored thia already while drawing
if (result != null)
{
RayHitTestResult res = result as RayHitTestResult;
if (res != null)
{
GeometryModel3D geoMod = res.ModelHit as GeometryModel3D;
HitDetails myHitDetails;
if (listOfHitPoints.TryGetValue(geoMod, out myHitDetails))
{
me.MouseDevice.SetCursor(Cursors.Hand);
SelectedHit = myHitDetails;
SelectedHit.ShowValue = false;
this.InvalidateVisual();
return;
}
}
}
SelectedHit = null;
}
this.InvalidateVisual();
}
/// <summary>
/// This methods draws 3D bars getting X,Y,Z values, Point to start, height, width and BarColor.
/// </summary>
/// <param name="XItem"></param>
/// <param name="YItem"></param>
/// <param name="ZItem"></param>
/// <param name="PointToStart"></param>
/// <param name="Height"></param>
/// <param name="Width"></param>
/// <param name="BarColor"></param>
/// <returns></returns>
private List<ModelVisual3D> Draw3DBar( string XItem, string YItem, string ZItem, Point3D PointToStart, double Height,
double Width, Color BarColor)
{
//////////////////////////////////////////////////////////////////////////////////////////////////////////
// This method first calculates the 8 points P0 to P7 required to draw the bar. Then it calculates //
// the points to write the Hit Text. I.e., when the bar is hit by a hovering mouse, we need to //
// display the X,Y,Z values for that bar. So this point P00 to P33 is calculated to draw the text //
// during hit text. We store this information in a seperate class called HitDetails with the geometry //
// as the hit key. Then we draw the bars using the DrawRect method. //
//////////////////////////////////////////////////////////////////////////////////////////////////////////
modelArray = new List<ModelVisual3D>();
// Points are calculated to draw the bar
Point3D P0 = new Point3D(PointToStart.X, PointToStart.Y, PointToStart.Z);
Point3D P1 = new Point3D(PointToStart.X + Width, PointToStart.Y, PointToStart.Z);
Point3D P2 = new Point3D(PointToStart.X + Width, PointToStart.Y, PointToStart.Z - Width);
Point3D P3 = new Point3D(PointToStart.X, PointToStart.Y, PointToStart.Z - Width);
Point3D P4 = new Point3D(PointToStart.X, PointToStart.Y + Height, PointToStart.Z);
Point3D P5 = new Point3D(PointToStart.X + Width, PointToStart.Y + Height, PointToStart.Z);
Point3D P6 = new Point3D(PointToStart.X + Width, PointToStart.Y + Height, PointToStart.Z - Width);
Point3D P7 = new Point3D(PointToStart.X, PointToStart.Y + Height, PointToStart.Z - Width);
ModelVisual3D myModelVisual = new ModelVisual3D();
Model3DGroup myModelGroup = new Model3DGroup();
// Points are calculated to draw the hit text and hit line
Point3D P00 = new Point3D(xStartingPoint, P4.Y + 0.3, P4.Z - Width / 2.0);
Point3D P11 = new Point3D(P4.X, P4.Y + 0.3, P4.Z - Width / 2.0);
Point3D P22 = new Point3D(P4.X, P4.Y, P4.Z - Width / 2.0 - 0.3);
Point3D P33 = new Point3D(xStartingPoint, P4.Y, P4.Z - Width / 2.0 - 0.3);
Point3D PtToWrite = new Point3D(P4.X, P4.Y + LITTLE_ABOVE, P4.Z + Width / 2.0 - 0.3);
HitDetails newHitDetails = new HitDetails(XItem, YItem, ZItem, P00, P11, P22, P33, PtToWrite, PointToStart, Width, Height, BarColor);
GeometryModel3D rectVisual = DrawRect(P0, P1, P5, P4, BarColor, DEFAULT_BRUSH_OPACITY);
listOfHitPoints.Add(rectVisual, newHitDetails);
myModelGroup.Children.Add(rectVisual);
// Lets draw the rectangles that form a full bar convering its top and bottom
Color LightColor = BarColor;
LightColor.A -= DROP_COLOR_BRIGHTNESS;
rectVisual = DrawRect(P1, P2, P6, P5, LightColor, DEFAULT_BAR_OPACITY);
listOfHitPoints.Add(rectVisual, newHitDetails);
myModelGroup.Children.Add(rectVisual);
rectVisual = DrawRect(P3, P2, P6, P7, BarColor, DEFAULT_BAR_OPACITY);
listOfHitPoints.Add(rectVisual, newHitDetails);
myModelGroup.Children.Add(rectVisual);
rectVisual = DrawRect(P0, P3, P7, P4, LightColor, DEFAULT_BAR_OPACITY);
listOfHitPoints.Add(rectVisual, newHitDetails);
myModelGroup.Children.Add(rectVisual);
LightColor.A -= DROP_MORE_COLOR_BRIGHTNESS;
rectVisual = DrawRect(P4, P5, P6, P7, LightColor, DEFAULT_BRUSH_OPACITY);
listOfHitPoints.Add(rectVisual, newHitDetails);
myModelGroup.Children.Add(rectVisual);
rectVisual = DrawRect(P0, P1, P2, P3, BarColor, DEFAULT_BRUSH_OPACITY);
listOfHitPoints.Add(rectVisual, newHitDetails);
myModelGroup.Children.Add(rectVisual);
myModelVisual.Content = myModelGroup;
modelArray.Add(myModelVisual);
// return the model to be added to the main ViewPort3D
return modelArray;
}