/// <summary>
/// Adds a new tree to the list of trees to draw.
/// </summary>
/// <param name="tree">the tree to add</param>
public void AddTree(AbstractTree tree)
{
if (tree.maxValue > this.maxValue || this.trees.Count == 0) {
this.maxValue = tree.maxValue; }
if (tree.minValue < this.minValue || this.trees.Count == 0) {
this.minValue = tree.minValue; }
this.trees.Add(tree);
this.DrawTrees();
}
/// <summary>
/// Draw a particular join tree.
/// </summary>
/// <param name="tree">the tree to draw</param>
/// <param name="graphics">allows things to be drawn</param>
/// <param name="pen">for drawing lines</param>
/// <param name="nodeFill">for drawing nodes</param>
protected override void drawTree(AbstractTree tree, Graphics graphics, Pen pen, Brush nodeFill)
{
int nrSlotsNeeded = tree.GetNumSlotsNeeded();
float pixelsPerSlot = this.GetPixelsPerSlot(nrSlotsNeeded);
float screenCenterX = this.Width / 2.0f;
float half_Diameter = NODE_DIAMETER / 2.0f;
int leftSlotsUsed = 0;
int rightSlotsUsed = 0;
// draw the top node
graphics.FillEllipse(nodeFill, screenCenterX - half_Diameter, this.ValueToYCoordinate(tree.maxValue) - half_Diameter, NODE_DIAMETER, NODE_DIAMETER);
TreeNode currentTrunkNode = tree.GetParentless()[0];
int currentDirection = -1;
while (currentTrunkNode.GetChildren().Count > 0) {
// look ahead at next trunk node
TreeNode nextTrunkNode = currentTrunkNode.GetChildren()[0];
// draw next node
graphics.FillEllipse(nodeFill, screenCenterX - half_Diameter, this.ValueToYCoordinate(nextTrunkNode.value) - half_Diameter, NODE_DIAMETER, NODE_DIAMETER);
// draw path to next trunk node
graphics.DrawLine(pen, screenCenterX, this.ValueToYCoordinate(currentTrunkNode.value),
screenCenterX, this.ValueToYCoordinate( nextTrunkNode.value));
// make a list of branches from the next trunk node
List<TreeNode> branches = new List<TreeNode>(nextTrunkNode.GetParents());
// remove the trunk node from the list of branches
branches.Remove(currentTrunkNode);
foreach (TreeNode branch in branches) {
drawBranch(branch, graphics, pen, nodeFill, currentDirection, currentDirection == -1 ? leftSlotsUsed : rightSlotsUsed, pixelsPerSlot, screenCenterX);
if (currentDirection == -1) {
leftSlotsUsed += branch.GetNumParentlessAncestors(); }
else {
rightSlotsUsed += branch.GetNumParentlessAncestors(); }
}
// toggle direction
currentDirection *= -1;
// point at next trunk node
currentTrunkNode = nextTrunkNode;
}
}
/// <summary> /// Draw one particular tree. /// </summary> /// <param name="tree">the tree to draw</param> /// <param name="graphics">allows things to be drawn</param> /// <param name="pen">for drawing lines</param> /// <param name="nodeFill">for drawing nodes</param> protected abstract void drawTree(AbstractTree tree, Graphics graphics, Pen pen, Brush nodeFill);
