|
public ToDeviceValue ( ISvgRenderer renderer, UnitRenderingType renderType, |
||
| renderer | ISvgRenderer | |
| renderType | UnitRenderingType | |
| owner | ||
| return | float | |
public float ToDeviceValue(ISvgRenderer renderer, UnitRenderingType renderType, SvgElement owner)
{
// If it's already been calculated
if (this._deviceValue.HasValue)
{
return this._deviceValue.Value;
}
if (this._value == 0.0f)
{
this._deviceValue = 0.0f;
return this._deviceValue.Value;
}
// http://www.w3.org/TR/CSS21/syndata.html#values
// http://www.w3.org/TR/SVG11/coords.html#Units
const float cmInInch = 2.54f;
int ppi = SvgDocument.PointsPerInch;
var type = this.Type;
var value = this.Value;
float points;
switch (type)
{
case SvgUnitType.Em:
using (var currFont = GetFont(renderer, owner))
{
if (currFont == null)
{
points = (float)(value * 9);
_deviceValue = (points / 72.0f) * ppi;
}
else
{
_deviceValue = value * (currFont.SizeInPoints / 72.0f) * ppi;
}
}
break;
case SvgUnitType.Ex:
using (var currFont = GetFont(renderer, owner))
{
if (currFont == null)
{
points = (float)(value * 9);
_deviceValue = (points * 0.5f / 72.0f) * ppi;
}
else
{
_deviceValue = value * 0.5f * (currFont.SizeInPoints / 72.0f) * ppi;
}
break;
}
case SvgUnitType.Centimeter:
_deviceValue = (float)((value / cmInInch) * ppi);
break;
case SvgUnitType.Inch:
_deviceValue = value * ppi;
break;
case SvgUnitType.Millimeter:
_deviceValue = (float)((value / 10) / cmInInch) * ppi;
break;
case SvgUnitType.Pica:
_deviceValue = ((value * 12) / 72) * ppi;
break;
case SvgUnitType.Point:
_deviceValue = (value / 72) * ppi;
break;
case SvgUnitType.Pixel:
_deviceValue = value;
break;
case SvgUnitType.User:
_deviceValue = value;
break;
case SvgUnitType.Percentage:
// Can't calculate if there is no style owner
var boundable = (renderer == null ? (owner == null ? null : owner.OwnerDocument) : renderer.GetBoundable());
if (boundable == null)
{
_deviceValue = value;
break;
}
System.Drawing.SizeF size = boundable.Bounds.Size;
switch (renderType)
{
case UnitRenderingType.Horizontal:
_deviceValue = (size.Width / 100) * value;
break;
case UnitRenderingType.HorizontalOffset:
_deviceValue = (size.Width / 100) * value + boundable.Location.X;
break;
case UnitRenderingType.Vertical:
_deviceValue = (size.Height / 100) * value;
break;
case UnitRenderingType.VerticalOffset:
_deviceValue = (size.Height / 100) * value + boundable.Location.Y;
break;
default:
_deviceValue = (float)(Math.Sqrt(Math.Pow(size.Width, 2) + Math.Pow(size.Height, 2)) / Math.Sqrt(2) * value / 100.0);
break;
}
break;
default:
_deviceValue = value;
break;
}
return this._deviceValue.Value;
}
private void DrawString(GraphicsPath path, SvgUnit x, SvgUnit y, SvgUnit dx, SvgUnit dy, Font font, float fontSize, string text)
{
PointF location = PointF.Empty;
SizeF stringBounds;
lock (_stringMeasure)
{
stringBounds = _stringMeasure.MeasureString(text, font);
}
float xToDevice = x.ToDeviceValue(this) + dx.ToDeviceValue(this);
float yToDevice = y.ToDeviceValue(this, true) + dy.ToDeviceValue(this, true);
// Minus FontSize because the x/y coords mark the bottom left, not bottom top.
switch (this.TextAnchor)
{
case SvgTextAnchor.Start:
location = new PointF(xToDevice, yToDevice - stringBounds.Height);
break;
case SvgTextAnchor.Middle:
location = new PointF(xToDevice - (stringBounds.Width / 2), yToDevice - stringBounds.Height);
break;
case SvgTextAnchor.End:
location = new PointF(xToDevice - stringBounds.Width, yToDevice - stringBounds.Height);
break;
}
// No way to do letter-spacing or word-spacing, so do manually
if (this.LetterSpacing.Value > 0.0f || this.WordSpacing.Value > 0.0f)
{
// Cut up into words, or just leave as required
string[] words = (this.WordSpacing.Value > 0.0f) ? text.Split(' ') : new string[] { text };
float wordSpacing = this.WordSpacing.ToDeviceValue(this);
float letterSpacing = this.LetterSpacing.ToDeviceValue(this);
float start = this.X.ToDeviceValue(this);
foreach (string word in words)
{
// Only do if there is line spacing, just write the word otherwise
if (this.LetterSpacing.Value > 0.0f)
{
char[] characters = word.ToCharArray();
foreach (char currentCharacter in characters)
{
path.AddString(currentCharacter.ToString(), new FontFamily(this._fontFamily), (int)font.Style, fontSize, location, StringFormat.GenericTypographic);
location = new PointF(path.GetBounds().Width + start + letterSpacing, location.Y);
}
}
else
{
path.AddString(word, new FontFamily(this._fontFamily), (int)font.Style, fontSize, location, StringFormat.GenericTypographic);
}
// Move the location of the word to be written along
location = new PointF(path.GetBounds().Width + start + wordSpacing, location.Y);
}
}
else
{
if (!string.IsNullOrEmpty(text))
{
path.AddString(text, new FontFamily(this._fontFamily), (int)font.Style, fontSize, location, StringFormat.GenericTypographic);
}
}
}