internal void AddSlurTemplate(double slurBeginX, double slurBeginY, double slurEndX, double slurEndY, double gap, bool isOver, double endAngle)
{
// The SVG scale is such that there is no problem using integers here.
double dyControl = gap * 3;
double dxControl = dyControl / Math.Tan(endAngle);
double x1 = slurBeginX;
double y1 = slurBeginY;
double x4 = slurEndX;
double y4 = slurEndY;
SlurTemplate slurTemplate = null;
double shortSlurMaxWidth = gap * 20; // 5 staff heights
double shortSlurMinWidth = gap * 9.5; // 4.4 is shortTieMaxWidth
double width = x4 - x1;
if (width <= shortSlurMaxWidth)
{
if (width <= shortSlurMinWidth)
{
double factor = width / shortSlurMinWidth;
dxControl *= factor;
dyControl *= factor;
}
// short (=two-point) slur template
// standard Bezier points
var p1 = new Point((int)x1, (int)y1);
var p2 = (isOver) ? new Point((int)(x1 + dxControl), (int)(y1 - dyControl)) : new Point((int)(x1 + dxControl), (int)(y1 + dyControl));
var p4 = new Point((int)x4, (int)y4);
var p3 = (isOver) ? new Point((int)(x4 - dxControl), (int)(y4 - dyControl)) : new Point((int)(x4 - dxControl), (int)(y4 + dyControl));
slurTemplate = new SlurTemplate(p1, p2, p3, p4, gap, isOver);
}
else
{
// long (=three-point) slur template
var p1 = new Point((int)x1, (int)y1);
var c1 = (isOver) ? new Point((int)(x1 + dxControl), (int)(y1 - dyControl)) : new Point((int)(x1 + dxControl), (int)(y1 + dyControl));
var p3 = new Point((int)x4, (int)y4);
var c3 = (isOver) ? new Point((int)(x4 - dxControl), (int)(y4 - dyControl)) : new Point((int)(x4 - dxControl), (int)(y4 + dyControl));
var p2 = new Point((int)((x1 + x4) / 2), (int)((y1 + c1.Y) / 2));
var c2 = new Point((p1.X + p2.X) / 2, p2.Y);
slurTemplate = new SlurTemplate(p1, c1, c2, p2, c3, p3, gap, isOver);
}
ChordMetrics.SlurTemplates.Add(slurTemplate); // So that the slurTemplate will be written to SVG.
ChordMetrics.AddSlurTieMetrics((SlurTieMetrics)slurTemplate.Metrics); // So that the tie will be moved vertically with the system.
}
/// <summary>
/// Tie templates have similar point and control point structures as a slurs, except that
/// 1. they are both horizontal and symmetric.
/// 2. the maximum width of a short tie is twice the width of a tie hook.
/// 3. long slurs have three points on the slur, long ties have four points on the tie.
/// </summary>
/// <param name="tieTemplateBeginX"></param>
/// <param name="tieBeginY"></param>
/// <param name="tieTemplateEndX"></param>
/// <param name="tieTemplateY"></param>
/// <param name="gap"></param>
/// <param name="isOver"></param>
internal void AddTieTemplate(double tieTemplateBeginX, double tieTemplateEndX, double tieTemplateY, double gap, bool isOver)
{
// The SVG scale is such that there should be no problem using integers here.
TieTemplate tieTemplate = null;
double p1x = tieTemplateBeginX;
double p1y = tieTemplateY;
double p2x = tieTemplateEndX;
double p2y = tieTemplateY;
double shortTieMaxWidth = gap * 10;
double veryShortTieMaxWidth = gap * 3.45;
double width = p2x - p1x;
double deltaControl; // the x and y distance between an end-point on the template and its related control point.
if (width <= shortTieMaxWidth)
{
deltaControl = (width <= veryShortTieMaxWidth) ? width / 3 : gap * 1.15;
var p1 = new Point((int)p1x, (int)p1y);
var c1 = (isOver) ? new Point((int)(p1x + deltaControl), (int)(p1y - deltaControl)) : new Point((int)(p1x + deltaControl), (int)(p1y + deltaControl));
var p2 = new Point((int)p2x, (int)p2y);
var c2 = (isOver) ? new Point((int)(p2x - deltaControl), (int)(p2y - deltaControl)) : new Point((int)(p2x - deltaControl), (int)(p2y + deltaControl));
tieTemplate = new ShortTieTemplate(p1, c1, c2, p2, gap, isOver);
}
else
{
deltaControl = (gap * 0.85);
// long tie template
var p1 = new Point((int)p1x, (int)p1y);
var c1 = (isOver) ? new Point((int)(p1x + deltaControl), (int)(p1y - deltaControl)) : new Point((int)(p1x + deltaControl), (int)(p1y + deltaControl));
var tc = new Point(c1.X + (int)(deltaControl / 2), c1.Y);
var tp = new Point((int)(p1x + (p2x - p1x) / 2), c1.Y);
var c2 = (isOver) ? new Point((int)(p2x - deltaControl), (int)(p2y - deltaControl)) : new Point((int)(p2x - deltaControl), (int)(p2y + deltaControl));
var p2 = new Point((int)p2x, (int)p2y);
tieTemplate = new LongTieTemplate(p1, c1, tc, tp, c2, p2, gap, isOver);
}
ChordMetrics.TieTemplates.Add(tieTemplate); // So that the slurTemplate will be written to SVG.
ChordMetrics.AddSlurTieMetrics((SlurTieMetrics)tieTemplate.Metrics); // So that the tie will be moved vertically with the system.
}
