internal bool dbugIsEqualsWith(GlyphPointF another)
{
return(this.P == another.P && this.onCurve == another.onCurve);
}
//for TrueType Font
public static void Read(this IGlyphTranslator tx, GlyphPointF[] glyphPoints, ushort[] contourEndPoints, float scale = 1)
{
int startContour = 0;
int cpoint_index = 0;//current point index
int todoContourCount = contourEndPoints.Length;
//-----------------------------------
//1. start read data from a glyph
tx.BeginRead(todoContourCount);
//-----------------------------------
float latest_moveto_x = 0;
float latest_moveto_y = 0;
int curveControlPointCount = 0; // 1 curve control point => Quadratic, 2 curve control points => Cubic
while (todoContourCount > 0)
{
//reset
curveControlPointCount = 0;
//foreach contour...
//next contour will begin at...
int nextCntBeginAtIndex = contourEndPoints[startContour] + 1;
//reset ...
bool has_c_begin = false; //see below [A]
Vector2 c_begin = new Vector2(); //special point if the glyph starts with 'off-curve' control point
Vector2 c1 = new Vector2(); //control point of quadratic curve
//-------------------------------------------------------------------
bool offCurveMode = false;
bool foundFirstOnCurvePoint = false;
bool startWithOffCurve = false;
int cnt_point_count = 0;
//-------------------------------------------------------------------
//[A]
//first point may start with 'ON CURVE" or 'OFF-CURVE'
//1. if first point is 'ON-CURVE' => we just set moveto command to it
//
//2. if first point is 'OFF-CURVE' => we store it into c_begin and set has_c_begin= true
// the c_begin will be use when we close the contour
//
//
//eg. glyph '2' in Century font starts with 'OFF-CURVE' point, and ends with 'OFF-CURVE'
//-------------------------------------------------------------------
#if DEBUG
int dbug_cmdcount = 0;
#endif
for (; cpoint_index < nextCntBeginAtIndex; ++cpoint_index)
{
#if DEBUG
dbug_cmdcount++;
#endif
//for each point in this contour
//point p is an on-curve point (on outline). (not curve control point)
//possible ways..
//1. if we are in curve mode, then p is end point
// we must decide which curve to create (Curve3 or Curve4)
// easy, ...
// if curveControlPointCount == 1 , then create Curve3
// else curveControlPointCount ==2 , then create Curve4
//2. if we are NOT in curve mode,
// if p is first point then set this to x0,y0
// else then p is end point of a line.
GlyphPointF p = glyphPoints[cpoint_index];
cnt_point_count++;
float p_x = p.X * scale;
float p_y = p.Y * scale;
//int vtag = (int)flags[cpoint_index] & 0x1;
//bool has_dropout = (((vtag >> 2) & 0x1) != 0);
//int dropoutMode = vtag >> 3;
if (p.onCurve)
{
//-------------------------------------------------------------------
//[B]
//point p is an 'on-curve' point (on outline).
//(not curve control point)***
//the point touch the outline.
//possible ways..
//1. if we are in offCurveMode, then p is a curve end point.
// we must decide which curve to create (Curve3 or Curve4)
// easy, ...
// if curveControlPointCount == 1 , then create Curve3
// else curveControlPointCount ==2 , then create Curve4 (BUT SHOULD NOT BE FOUND IN TRUE TYPEFONT'(
//2. if we are NOT in offCurveMode,
// if p is first point then set this to =>moveto(x0,y0)
// else then p is end point of a line => lineto(x1,y1)
//-------------------------------------------------------------------
if (offCurveMode)
{
//as describe above [B.1] ,...
switch (curveControlPointCount)
{
case 1:
tx.Curve3(
c1.X, c1.Y,
p_x, p_y);
break;
default:
//for TrueType font
//we should not be here?
throw new NotSupportedException();
}
//reset curve control point count
curveControlPointCount = 0;
//we touch the curve, set offCurveMode= false
offCurveMode = false;
}
else
{
// p is ON CURVE, but now we are in OFF-CURVE mode.
//
//as describe above [B.2] ,...
if (!foundFirstOnCurvePoint)
{
//special treament for first point
foundFirstOnCurvePoint = true;
switch (curveControlPointCount)
{
case 0:
//describe above, see [A.1]
tx.MoveTo(latest_moveto_x = p_x, latest_moveto_y = p_y);
break;
case 1:
//describe above, see [A.2]
c_begin = c1;
has_c_begin = true;
//since c1 is off curve
//we skip the c1 for and use it when we close the curve
tx.MoveTo(latest_moveto_x = p_x, latest_moveto_y = p_y);
curveControlPointCount--;
break;
default: throw new NotSupportedException();
}
}
else
{
tx.LineTo(p_x, p_y);
}
//if (has_dropout)
//{
// //printf("[%d] on,dropoutMode=%d: %d,y:%d \n", mm, dropoutMode, vpoint.x, vpoint.y);
//}
//else
//{
// //printf("[%d] on,x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
//}
}
}
else
{
//p is OFF-CURVE point (this is curve control point)
//
if (cnt_point_count == 1)
{
//1st point
startWithOffCurve = true;
}
switch (curveControlPointCount)
{
case 0:
c1 = new Vector2(p_x, p_y);
if (foundFirstOnCurvePoint)
{
//this point is curve control point***
//so set curve mode = true
//check number if existing curve control
offCurveMode = true;
}
else
{
//describe above, see [A.2]
}
break;
case 1:
{
if (!foundFirstOnCurvePoint)
{
Vector2 mid2 = GetMidPoint(c1, p_x, p_y);
//----------
//2. generate curve3 ***
c_begin = c1;
has_c_begin = true;
tx.MoveTo(latest_moveto_x = mid2.X, latest_moveto_y = mid2.Y);
offCurveMode = true;
foundFirstOnCurvePoint = true;
c1 = new Vector2(p_x, p_y);
continue;
}
//we already have previous 1st control point (c1)
//-------------------------------------
//please note that TrueType font
//compose of Quadractic Bezier Curve (Curve3) ***
//-------------------------------------
//in this case, this is NOT Cubic,
//this is 2 CONNECTED Quadractic Bezier Curves***
//
//we must create 'end point' of the first curve
//and set it as 'begin point of the second curve.
//
//this is done by ...
//1. calculate mid point between c1 and the latest point (p_x,p_y)
Vector2 mid = GetMidPoint(c1, p_x, p_y);
//----------
//2. generate curve3 ***
tx.Curve3(
c1.X, c1.Y,
mid.X, mid.Y);
//------------------------
//3. so curve control point number is reduce by 1***
curveControlPointCount--;
//------------------------
//4. and set (p_x,p_y) as 1st control point for the new curve
c1 = new Vector2(p_x, p_y);
offCurveMode = true;
//
//printf("[%d] bzc2nd, x: %d,y:%d \n", mm, vpoint.x, vpoint.y);
}
break;
default:
throw new NotSupportedException();
}
//count
curveControlPointCount++;
}
}
//--------
//when finish,
//ensure that the contour is closed.
if (offCurveMode)
{
switch (curveControlPointCount)
{
case 0: break;
case 1:
{
if (has_c_begin)
{
Vector2 mid = GetMidPoint(c1, c_begin.X, c_begin.Y);
//----------
//2. generate curve3 ***
tx.Curve3(
c1.X, c1.Y,
mid.X, mid.Y);
//------------------------
//3. so curve control point number is reduce by 1***
curveControlPointCount--;
//------------------------
tx.Curve3(
c_begin.X, c_begin.Y,
latest_moveto_x, latest_moveto_y);
}
else
{
tx.Curve3(
c1.X, c1.Y,
latest_moveto_x, latest_moveto_y);
}
}
break;
default:
//for TrueType font
//we should not be here?
throw new NotSupportedException();
}
}
else
{
//end with touch curve
//but if this start with off curve
//then we must close it properly
if (startWithOffCurve)
{
//start with off-curve and end with touch curve
tx.Curve3(
c_begin.X, c_begin.Y,
latest_moveto_x, latest_moveto_y);
}
}
//--------
tx.CloseContour(); //***
startContour++;
//--------
todoContourCount--;
//--------
}
//finish
tx.EndRead();
}