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Rendering
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VectorRenderer.cs
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// Copyright 2005, 2006 - Morten Nielsen (www.iter.dk)
//
// This file is part of SharpMap.
// SharpMap is free software; you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// SharpMap is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
// You should have received a copy of the GNU Lesser General Public License
// along with SharpMap; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
using
System
;
using
System
.
Collections
.
Generic
;
using
System
.
Drawing
;
using
System
.
Drawing
.
Drawing2D
;
using
System
.
Linq
;
using
System
.
Reflection
;
using
GeoAPI
.
Geometries
;
using
SharpMap
.
Rendering
.
Symbolizer
;
using
SharpMap
.
Styles
;
using
Point
=
GeoAPI
.
Geometries
.
Coordinate
;
using
System
.
Runtime
.
CompilerServices
;
namespace
SharpMap
.
Rendering
{
/// <summary>
/// This class renders individual geometry features to a graphics object using the settings of a map object.
/// </summary>
public
static
class
VectorRenderer
{
internal
const
float
ExtremeValueLimit
=
1E+8f
;
internal
const
float
NearZero
=
1E-30f
;
// 1/Infinity
static
VectorRenderer
(
)
{
SizeOfString
=
SizeOfStringCeiling
;
}
private
static
readonly
Bitmap
_defaultSymbol
=
(
Bitmap
)
Image
.
FromStream
(
Assembly
.
GetExecutingAssembly
(
)
.
GetManifestResourceStream
(
"SharpMap.Styles.DefaultSymbol.png"
)
)
;
/// <summary>
/// Renders a MultiLineString to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="lines">MultiLineString to be rendered</param>
/// <param name="pen">Pen style used for rendering</param>
/// <param name="map">Map reference</param>
/// <param name="offset">Offset by which line will be moved to right</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
void
DrawMultiLineString
(
Graphics
g
,
IMultiLineString
lines
,
Pen
pen
,
MapViewport
map
,
float
offset
)
{
DrawMultiLineStringEx
(
g
,
lines
,
pen
,
map
,
offset
)
;
}
/// <summary>
/// Renders a MultiLineString to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="lines">MultiLineString to be rendered</param>
/// <param name="pen">Pen style used for rendering</param>
/// <param name="map">Map reference</param>
/// <param name="offset">Offset by which line will be moved to right</param>
/// <returns>The area of the map that was affected by the drawing operation</returns>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
RectangleF
DrawMultiLineStringEx
(
Graphics
g
,
IMultiLineString
lines
,
Pen
pen
,
MapViewport
map
,
float
offset
)
{
var
canvasArea
=
RectangleF
.
Empty
;
for
(
int
i
=
0
;
i
<
lines
.
NumGeometries
;
i
++
)
{
var
line
=
(
ILineString
)
lines
[
i
]
;
var
rect
=
DrawLineStringEx
(
g
,
line
,
pen
,
map
,
offset
)
;
canvasArea
=
rect
.
ExpandToInclude
(
canvasArea
)
;
}
return
canvasArea
;
}
/// <summary>
/// Offset drawn linestring by given pixel width
/// </summary>
/// <param name="points"></param>
/// <param name="offset"></param>
/// <returns></returns>
internal
static
PointF
[
]
OffsetRight
(
PointF
[
]
points
,
float
offset
)
{
int
length
=
points
.
Length
;
var
newPoints
=
new
PointF
[
(
length
-
1
)
*
2
]
;
float
space
=
(
offset
*
offset
/
4
)
+
1
;
//if there are two or more points
if
(
length
>=
2
)
{
var
counter
=
0
;
float
x
=
0
,
y
=
0
;
for
(
var
i
=
0
;
i
<
length
-
1
;
i
++
)
{
var
b
=
-
(
points
[
i
+
1
]
.
X
-
points
[
i
]
.
X
)
;
if
(
b
!=
0
)
{
var
a
=
points
[
i
+
1
]
.
Y
-
points
[
i
]
.
Y
;
var
c
=
a
/
b
;
y
=
2
*
(
float
)
Math
.
Sqrt
(
space
/
(
c
*
c
+
1
)
)
;
y
=
b
<
0
?
y
:
-
y
;
x
=
c
*
y
;
if
(
offset
<
0
)
{
y
=
-
y
;
x
=
-
x
;
}
newPoints
[
counter
]
=
new
PointF
(
points
[
i
]
.
X
+
x
,
points
[
i
]
.
Y
+
y
)
;
newPoints
[
counter
+
1
]
=
new
PointF
(
points
[
i
+
1
]
.
X
+
x
,
points
[
i
+
1
]
.
Y
+
y
)
;
}
else
{
newPoints
[
counter
]
=
new
PointF
(
points
[
i
]
.
X
+
x
,
points
[
i
]
.
Y
+
y
)
;
newPoints
[
counter
+
1
]
=
new
PointF
(
points
[
i
+
1
]
.
X
+
x
,
points
[
i
+
1
]
.
Y
+
y
)
;
}
counter
+=
2
;
}
return
newPoints
;
}
return
points
;
}
/// <summary>
/// Renders a LineString to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="line">LineString to render</param>
/// <param name="pen">Pen style used for rendering</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
[
Obsolete
(
"Not called, will be removed"
)
]
public
static
void
DrawLineString
(
Graphics
g
,
ILineString
line
,
Pen
pen
,
MapViewport
map
)
{
DrawLineString
(
g
,
line
,
pen
,
map
,
0f
)
;
}
/// <summary>
/// Renders a LineString to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="line">LineString to render</param>
/// <param name="pen">Pen style used for rendering</param>
/// <param name="map">Map reference</param>
/// <param name="offset">Offset by which line will be moved to right</param>
public
static
void
DrawLineString
(
Graphics
g
,
ILineString
line
,
Pen
pen
,
MapViewport
map
,
float
offset
)
{
DrawLineStringEx
(
g
,
line
,
pen
,
map
,
offset
)
;
}
/// <summary>
/// Renders a LineString to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="line">LineString to render</param>
/// <param name="pen">Pen style used for rendering</param>
/// <param name="map">Map reference</param>
/// <param name="offset">Offset by which line will be moved to right</param>
/// <returns>The area of the map that was affected by the drawing of the geometry.</returns>
public
static
RectangleF
DrawLineStringEx
(
Graphics
g
,
ILineString
line
,
Pen
pen
,
MapViewport
map
,
float
offset
)
{
var
points
=
line
.
TransformToImage
(
map
)
;
if
(
points
.
Length
<
2
)
return
RectangleF
.
Empty
;
using
(
var
gp
=
new
GraphicsPath
(
)
)
{
if
(
offset
!=
0d
)
points
=
OffsetRight
(
points
,
offset
)
;
gp
.
AddLines
(
LimitValues
(
points
,
ExtremeValueLimit
)
)
;
g
.
DrawPath
(
pen
,
gp
)
;
var
bounds
=
gp
.
GetBounds
(
)
;
bounds
.
Inflate
(
pen
.
Width
/
2f
,
pen
.
Width
/
2f
)
;
return
bounds
;
}
}
/// <summary>
/// Renders a multipolygon byt rendering each polygon in the collection by calling DrawPolygon.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="multiPolygon">MultiPolygon to render</param>
/// <param name="brush">Brush used for filling (null or transparent for no filling)</param>
/// <param name="pen">Outline pen style (null if no outline)</param>
/// <param name="clip">Specifies whether polygon clipping should be applied</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
void
DrawMultiPolygon
(
Graphics
g
,
IMultiPolygon
multiPolygon
,
Brush
brush
,
Pen
pen
,
bool
clip
,
MapViewport
map
)
{
DrawMultiPolygonEx
(
g
,
multiPolygon
,
brush
,
pen
,
clip
,
map
)
;
}
/// <summary>
/// Renders a multipolygon byt rendering each polygon in the collection by calling DrawPolygon.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="multiPolygon">MultiPolygon to render</param>
/// <param name="brush">Brush used for filling (null or transparent for no filling)</param>
/// <param name="pen">Outline pen style (null if no outline)</param>
/// <param name="clip">Specifies whether polygon clipping should be applied</param>
/// <param name="map">Map reference</param>
/// <returns>The area of the map that was affected by the drawing of the geometry.</returns>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
RectangleF
DrawMultiPolygonEx
(
Graphics
g
,
IMultiPolygon
multiPolygon
,
Brush
brush
,
Pen
pen
,
bool
clip
,
MapViewport
map
)
{
var
canvasArea
=
RectangleF
.
Empty
;
for
(
var
i
=
0
;
i
<
multiPolygon
.
NumGeometries
;
i
++
)
{
var
p
=
(
IPolygon
)
multiPolygon
[
i
]
;
var
rect
=
DrawPolygonEx
(
g
,
p
,
brush
,
pen
,
clip
,
map
)
;
canvasArea
=
rect
.
ExpandToInclude
(
canvasArea
)
;
}
return
canvasArea
;
}
/// <summary>
/// Renders a polygon to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="pol">Polygon to render</param>
/// <param name="brush">Brush used for filling (null or transparent for no filling)</param>
/// <param name="pen">Outline pen style (null if no outline)</param>
/// <param name="clip">Specifies whether polygon clipping should be applied</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
void
DrawPolygon
(
Graphics
g
,
IPolygon
pol
,
Brush
brush
,
Pen
pen
,
bool
clip
,
MapViewport
map
)
{
DrawPolygonEx
(
g
,
pol
,
brush
,
pen
,
clip
,
map
)
;
}
/// <summary>
/// Renders a polygon to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="pol">Polygon to render</param>
/// <param name="brush">Brush used for filling (null or transparent for no filling)</param>
/// <param name="pen">Outline pen style (null if no outline)</param>
/// <param name="clip">Specifies whether polygon clipping should be applied</param>
/// <param name="map">Map reference</param>
/// <returns>The area of the map that was affected by the drawing of the geometry.</returns>
public
static
RectangleF
DrawPolygonEx
(
Graphics
g
,
IPolygon
pol
,
Brush
brush
,
Pen
pen
,
bool
clip
,
MapViewport
map
)
{
if
(
pol
.
ExteriorRing
==
null
)
return
RectangleF
.
Empty
;
var
points
=
pol
.
ExteriorRing
.
TransformToImage
(
map
)
;
if
(
points
.
Length
<=
2
)
return
RectangleF
.
Empty
;
//Use a graphics path instead of DrawPolygon. DrawPolygon has a problem with several interior holes
using
(
var
gp
=
new
GraphicsPath
(
)
)
{
//Add the exterior polygon
if
(
!
clip
)
gp
.
AddPolygon
(
LimitValues
(
points
,
ExtremeValueLimit
)
)
;
else
DrawPolygonClipped
(
gp
,
LimitValues
(
points
,
ExtremeValueLimit
)
,
map
.
Size
.
Width
,
map
.
Size
.
Height
)
;
//Add the interior polygons (holes)
if
(
pol
.
NumInteriorRings
>
0
)
{
foreach
(
ILinearRing
ring
in
pol
.
InteriorRings
)
{
points
=
ring
.
TransformToImage
(
map
)
;
if
(
!
clip
)
gp
.
AddPolygon
(
LimitValues
(
points
,
ExtremeValueLimit
)
)
;
else
DrawPolygonClipped
(
gp
,
LimitValues
(
points
,
ExtremeValueLimit
)
,
map
.
Size
.
Width
,
map
.
Size
.
Height
)
;
}
}
// Only render inside of polygon if the brush isn't null or isn't transparent
if
(
brush
!=
null
&&
brush
!=
Brushes
.
Transparent
)
g
.
FillPath
(
brush
,
gp
)
;
// Create an outline if a pen style is available
if
(
pen
!=
null
)
g
.
DrawPath
(
pen
,
gp
)
;
// refer to comments on DrawLineStringEx for determining bounds
var
bounds
=
gp
.
GetBounds
(
)
;
if
(
pen
!=
null
)
bounds
.
Inflate
(
pen
.
Width
/
2f
,
pen
.
Width
/
2f
)
;
return
bounds
;
}
}
private
static
void
DrawPolygonClipped
(
GraphicsPath
gp
,
PointF
[
]
polygon
,
int
width
,
int
height
)
{
var
clipState
=
DetermineClipState
(
polygon
,
width
,
height
)
;
if
(
clipState
==
ClipState
.
Within
)
{
gp
.
AddPolygon
(
polygon
)
;
}
else
if
(
clipState
==
ClipState
.
Intersecting
)
{
var
clippedPolygon
=
ClipPolygon
(
polygon
,
width
,
height
)
;
if
(
clippedPolygon
.
Length
>
2
)
gp
.
AddPolygon
(
clippedPolygon
)
;
}
}
/// <summary>
/// Purpose of this method is to prevent the 'overflow error' exception in the FillPath method.
/// This Exception is thrown when the coordinate values become too big (values over -2E+9f always
/// throw an exception, values under 1E+8f seem to be okay). This method limits the coordinates to
/// the values given by the second parameter (plus an minus). Theoretically the lines to and from
/// these limited points are not correct but GDI+ paints incorrect even before that limit is reached.
/// </summary>
/// <param name="vertices">The vertices that need to be limited</param>
/// <param name="limit">The limit at which coordinate values will be cutoff</param>
/// <returns>The limited vertices</returns>
public
static
PointF
[
]
LimitValues
(
PointF
[
]
vertices
,
float
limit
)
{
for
(
var
i
=
0
;
i
<
vertices
.
Length
;
i
++
)
{
vertices
[
i
]
.
X
=
Math
.
Max
(
-
limit
,
Math
.
Min
(
limit
,
vertices
[
i
]
.
X
)
)
;
vertices
[
i
]
.
Y
=
Math
.
Max
(
-
limit
,
Math
.
Min
(
limit
,
vertices
[
i
]
.
Y
)
)
;
}
return
vertices
;
}
/// <summary>
/// Signature for a function that evaluates the length of a string when rendered on a Graphics object with a given font
/// </summary>
/// <param name="g"><see cref="Graphics"/> object</param>
/// <param name="text">the text to render</param>
/// <param name="font">the font to use</param>
/// <returns>the size</returns>
public
delegate
SizeF
SizeOfStringDelegate
(
Graphics
g
,
string
text
,
Font
font
)
;
private
static
SizeOfStringDelegate
_sizeOfString
;
/// <summary>
/// Delegate used to determine the <see cref="SizeF"/> of a given string.
/// </summary>
public
static
SizeOfStringDelegate
SizeOfString
{
get
{
return
_sizeOfString
??
(
_sizeOfString
=
SizeOfStringCeiling
)
;
}
set
{
if
(
value
!=
null
)
_sizeOfString
=
value
;
}
}
/// <summary>
/// Function to get the <see cref="SizeF"/> of a string when rendered with the given font.
/// </summary>
/// <param name="g"><see cref="Graphics"/> object</param>
/// <param name="text">the text to render</param>
/// <param name="font">the font to use</param>
/// <returns>the size</returns>
public
static
SizeF
SizeOfStringBase
(
Graphics
g
,
string
text
,
Font
font
)
{
return
g
.
MeasureString
(
text
,
font
)
;
}
/// <summary>
/// Function to get the <see cref="SizeF"/> of a string when rendered with the given font.
/// </summary>
/// <param name="g"><see cref="Graphics"/> object</param>
/// <param name="text">the text to render</param>
/// <param name="font">the font to use</param>
/// <returns>the size</returns>
[
Obsolete
]
public
static
SizeF
SizeOfString74
(
Graphics
g
,
string
text
,
Font
font
)
{
var
s
=
g
.
MeasureString
(
text
,
font
)
;
return
new
SizeF
(
s
.
Width
*
0.74f
+
1f
,
s
.
Height
*
0.74f
)
;
}
/// <summary>
/// Function to get the <see cref="SizeF"/> of a string when rendered with the given font.
/// </summary>
/// <param name="g"><see cref="Graphics"/> object</param>
/// <param name="text">the text to render</param>
/// <param name="font">the font to use</param>
/// <returns>the size</returns>
public
static
SizeF
SizeOfStringCeiling
(
Graphics
g
,
string
text
,
Font
font
)
{
SizeF
f
=
g
.
MeasureString
(
text
,
font
)
;
return
new
SizeF
(
(
float
)
Math
.
Ceiling
(
f
.
Width
)
,
(
float
)
Math
.
Ceiling
(
f
.
Height
)
)
;
}
/// <summary>
/// Renders a label to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="labelPoint">Label placement</param>
/// <param name="offset">Offset of label in screen coordinates</param>
/// <param name="font">Font used for rendering</param>
/// <param name="foreColor">Font foreground color</param>
/// <param name="backColor">Background color</param>
/// <param name="halo">Color of halo</param>
/// <param name="rotation">Text rotation in degrees</param>
/// <param name="text">Text to render</param>
/// <param name="map">Map reference</param>
/// <param name="alignment">Horizontal alignment for multi line labels. If not set <see cref="StringAlignment.Near"/> is used</param>
/// <param name="rotationPoint">Point where the rotation should take place</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
void
DrawLabel
(
Graphics
g
,
PointF
labelPoint
,
PointF
offset
,
Font
font
,
Color
foreColor
,
Brush
backColor
,
Pen
halo
,
float
rotation
,
string
text
,
MapViewport
map
,
LabelStyle
.
HorizontalAlignmentEnum
alignment
=
LabelStyle
.
HorizontalAlignmentEnum
.
Left
,
PointF
?
rotationPoint
=
null
)
{
DrawLabelEx
(
g
,
labelPoint
,
offset
,
font
,
foreColor
,
backColor
,
halo
,
rotation
,
text
,
map
,
alignment
,
rotationPoint
)
;
}
/// <summary>
/// Renders a label to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="labelPoint">Label placement</param>
/// <param name="offset">Offset of label in screen coordinates</param>
/// <param name="font">Font used for rendering</param>
/// <param name="foreColor">Font foreground color</param>
/// <param name="backColor">Background color</param>
/// <param name="halo">Color of halo</param>
/// <param name="rotation">Text rotation in degrees</param>
/// <param name="text">Text to render</param>
/// <param name="map">Map reference</param>
/// <param name="alignment">Horizontal alignment for multi line labels. If not set <see cref="StringAlignment.Near"/> is used</param>
/// <param name="rotationPoint">Point where the rotation should take place</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
RectangleF
DrawLabelEx
(
Graphics
g
,
PointF
labelPoint
,
PointF
offset
,
Font
font
,
Color
foreColor
,
Brush
backColor
,
Pen
halo
,
float
rotation
,
string
text
,
MapViewport
map
,
LabelStyle
.
HorizontalAlignmentEnum
alignment
=
LabelStyle
.
HorizontalAlignmentEnum
.
Left
,
PointF
?
rotationPoint
=
null
)
{
//Calculate the size of the text
var
labelSize
=
_sizeOfString
(
g
,
text
,
font
)
;
//Add label offset
labelPoint
.
X
+=
offset
.
X
;
labelPoint
.
Y
+=
offset
.
Y
;
//Translate alignment to stringalignment
StringAlignment
sAlign
;
switch
(
alignment
)
{
case
LabelStyle
.
HorizontalAlignmentEnum
.
Left
:
sAlign
=
StringAlignment
.
Near
;
break
;
case
LabelStyle
.
HorizontalAlignmentEnum
.
Center
:
sAlign
=
StringAlignment
.
Center
;
break
;
default
:
sAlign
=
StringAlignment
.
Far
;
break
;
}
Matrix
origTrans
=
null
;
Matrix
symTrans
=
null
;
if
(
rotation
!=
0
&&
!
float
.
IsNaN
(
rotation
)
)
{
rotationPoint
=
rotationPoint
??
labelPoint
;
origTrans
=
g
.
Transform
.
Clone
(
)
;
g
.
TranslateTransform
(
rotationPoint
.
Value
.
X
,
rotationPoint
.
Value
.
Y
)
;
g
.
RotateTransform
(
rotation
)
;
labelPoint
=
new
PointF
(
labelPoint
.
X
-
rotationPoint
.
Value
.
X
,
labelPoint
.
Y
-
rotationPoint
.
Value
.
Y
)
;
symTrans
=
new
Matrix
(
)
;
symTrans
.
Translate
(
rotationPoint
.
Value
.
X
,
rotationPoint
.
Value
.
Y
)
;
symTrans
.
Rotate
(
rotation
)
;
}
var
background
=
new
RectangleF
(
labelPoint
.
X
,
labelPoint
.
Y
,
labelSize
.
Width
,
labelSize
.
Height
)
;
if
(
backColor
!=
null
&&
backColor
!=
Brushes
.
Transparent
)
g
.
FillRectangle
(
backColor
,
background
)
;
using
(
var
path
=
new
GraphicsPath
(
)
)
{
path
.
AddString
(
text
,
font
.
FontFamily
,
(
int
)
font
.
Style
,
font
.
Size
,
new
RectangleF
(
labelPoint
,
labelSize
)
,
new
StringFormat
{
Alignment
=
sAlign
}
)
;
if
(
halo
!=
null
)
{
g
.
DrawPath
(
halo
,
path
)
;
// excessive halo can bleed outside of background
background
.
Inflate
(
halo
.
Width
/
2f
,
halo
.
Width
/
2f
)
;
}
g
.
FillPath
(
new
SolidBrush
(
foreColor
)
,
path
)
;
}
if
(
origTrans
!=
null
)
{
g
.
Transform
=
origTrans
;
origTrans
.
Dispose
(
)
;
}
if
(
symTrans
==
null
)
return
background
;
var
pts
=
background
.
ToPointArray
(
)
;
symTrans
.
TransformPoints
(
pts
)
;
symTrans
.
Dispose
(
)
;
return
pts
.
ToRectangleF
(
)
;
}
private
static
ClipState
DetermineClipState
(
PointF
[
]
vertices
,
int
width
,
int
height
)
{
float
minX
=
float
.
MaxValue
;
float
minY
=
float
.
MaxValue
;
float
maxX
=
float
.
MinValue
;
float
maxY
=
float
.
MinValue
;
for
(
int
i
=
0
;
i
<
vertices
.
Length
;
i
++
)
{
minX
=
Math
.
Min
(
minX
,
vertices
[
i
]
.
X
)
;
minY
=
Math
.
Min
(
minY
,
vertices
[
i
]
.
Y
)
;
maxX
=
Math
.
Max
(
maxX
,
vertices
[
i
]
.
X
)
;
maxY
=
Math
.
Max
(
maxY
,
vertices
[
i
]
.
Y
)
;
}
if
(
maxX
<
0
)
return
ClipState
.
Outside
;
if
(
maxY
<
0
)
return
ClipState
.
Outside
;
if
(
minX
>
width
)
return
ClipState
.
Outside
;
if
(
minY
>
height
)
return
ClipState
.
Outside
;
if
(
minX
>
0
&&
maxX
<
width
&&
minY
>
0
&&
maxY
<
height
)
return
ClipState
.
Within
;
return
ClipState
.
Intersecting
;
}
/// <summary>
/// Clips a polygon to the view.
/// Based on UMN Mapserver renderer
/// </summary>
/// <param name="vertices">vertices in image coordinates</param>
/// <param name="width">Width of map in image coordinates</param>
/// <param name="height">Height of map in image coordinates</param>
/// <returns>Clipped polygon</returns>
internal
static
PointF
[
]
ClipPolygon
(
PointF
[
]
vertices
,
int
width
,
int
height
)
{
var
line
=
new
List
<
PointF
>
(
)
;
if
(
vertices
.
Length
<=
1
)
/* nothing to clip */
return
vertices
;
for
(
int
i
=
0
;
i
<
vertices
.
Length
-
1
;
i
++
)
{
var
x1
=
vertices
[
i
]
.
X
;
var
y1
=
vertices
[
i
]
.
Y
;
var
x2
=
vertices
[
i
+
1
]
.
X
;
var
y2
=
vertices
[
i
+
1
]
.
Y
;
var
deltaX
=
x2
-
x1
;
if
(
deltaX
==
0f
)
{
// bump off of the vertical
deltaX
=
(
x1
>
0
)
?
-
NearZero
:
NearZero
;
}
var
deltaY
=
y2
-
y1
;
if
(
deltaY
==
0f
)
{
// bump off of the horizontal
deltaY
=
(
y1
>
0
)
?
-
NearZero
:
NearZero
;
}
float
xIn
;
float
xOut
;
if
(
deltaX
>
0
)
{
// points to right
xIn
=
0
;
xOut
=
width
;
}
else
{
xIn
=
width
;
xOut
=
0
;
}
float
yIn
;
float
yOut
;
if
(
deltaY
>
0
)
{
// points up
yIn
=
0
;
yOut
=
height
;
}
else
{
yIn
=
height
;
yOut
=
0
;
}
var
tinX
=
(
xIn
-
x1
)
/
deltaX
;
var
tinY
=
(
yIn
-
y1
)
/
deltaY
;
float
tIn1
;
float
tIn2
;
if
(
tinX
<
tinY
)
{
// hits x first
tIn1
=
tinX
;
tIn2
=
tinY
;
}
else
{
// hits y first
tIn1
=
tinY
;
tIn2
=
tinX
;
}
if
(
1
>=
tIn1
)
{
if
(
0
<
tIn1
)
line
.
Add
(
new
PointF
(
xIn
,
yIn
)
)
;
if
(
1
>=
tIn2
)
{
var
tOutX
=
(
xOut
-
x1
)
/
deltaX
;
var
tOutY
=
(
yOut
-
y1
)
/
deltaY
;
var
tOut
=
(
tOutX
<
tOutY
)
?
tOutX
:
tOutY
;
if
(
0
<
tIn2
||
0
<
tOut
)
{
if
(
tIn2
<=
tOut
)
{
if
(
0
<
tIn2
)
{
line
.
Add
(
tinX
>
tinY
?
new
PointF
(
xIn
,
y1
+
tinX
*
deltaY
)
:
new
PointF
(
x1
+
tinY
*
deltaX
,
yIn
)
)
;
}
if
(
1
>
tOut
)
{
line
.
Add
(
tOutX
<
tOutY
?
new
PointF
(
xOut
,
y1
+
tOutX
*
deltaY
)
:
new
PointF
(
x1
+
tOutY
*
deltaX
,
yOut
)
)
;
}
else
line
.
Add
(
new
PointF
(
x2
,
y2
)
)
;
}
else
{
line
.
Add
(
tinX
>
tinY
?
new
PointF
(
xIn
,
yOut
)
:
new
PointF
(
xOut
,
yIn
)
)
;
}
}
}
}
}
if
(
line
.
Count
>
0
)
line
.
Add
(
new
PointF
(
line
[
0
]
.
X
,
line
[
0
]
.
Y
)
)
;
return
line
.
ToArray
(
)
;
}
/// <summary>
/// Renders a point to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="point">Point to render</param>
/// <param name="b">Brush reference</param>
/// <param name="size">Size of drawn Point</param>
/// <param name="offset">Symbol offset af scale=1</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
void
DrawPoint
(
Graphics
g
,
IPoint
point
,
Brush
b
,
float
size
,
PointF
offset
,
MapViewport
map
)
{
DrawPointEx
(
g
,
point
,
b
,
size
,
offset
,
map
)
;
}
/// <summary>
/// Renders a point to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="point">Point to render</param>
/// <param name="b">Brush reference</param>
/// <param name="size">Size of drawn Point</param>
/// <param name="offset">Symbol offset af scale=1</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
RectangleF
DrawPointEx
(
Graphics
g
,
IPoint
point
,
Brush
b
,
float
size
,
PointF
offset
,
MapViewport
map
)
{
if
(
point
==
null
)
return
RectangleF
.
Empty
;
var
pp
=
map
.
WorldToImage
(
point
.
Coordinate
)
;
var
width
=
size
;
var
height
=
size
;
float
minX
=
(
int
)
pp
.
X
-
width
/
2
+
offset
.
X
;
float
minY
=
(
int
)
pp
.
Y
-
height
/
2
+
offset
.
Y
;
g
.
FillEllipse
(
b
,
minX
,
minY
,
width
,
height
)
;
return
new
RectangleF
(
minX
,
minY
,
width
,
height
)
;
}
/// <summary>
/// Renders a point to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="point">Point to render</param>
/// <param name="symbolizer">Symbolizer to decorate point</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
void
DrawPoint
(
IPointSymbolizer
symbolizer
,
Graphics
g
,
IPoint
point
,
MapViewport
map
)
=>
DrawPointEx
(
symbolizer
,
g
,
point
,
map
)
;
/// <summary>
/// Renders a point to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="point">Point to render</param>
/// <param name="symbolizer">Symbolizer to decorate point</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
RectangleF
DrawPointEx
(
IPointSymbolizer
symbolizer
,
Graphics
g
,
IPoint
point
,
MapViewport
map
)
{
if
(
point
==
null
)
return
RectangleF
.
Empty
;
symbolizer
.
Render
(
map
,
point
,
g
)
;
return
(
(
IPointSymbolizerEx
)
symbolizer
)
.
CanvasArea
;
}
/// <summary>
/// Renders a point to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="point">Point to render</param>
/// <param name="symbol">Symbol to place over point</param>
/// <param name="symbolscale">The amount that the symbol should be scaled. A scale of '1' equals to no scaling</param>
/// <param name="offset">Symbol offset af scale=1</param>
/// <param name="rotation">Symbol rotation in degrees</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
void
DrawPoint
(
Graphics
g
,
IPoint
point
,
Image
symbol
,
float
symbolscale
,
PointF
offset
,
float
rotation
,
MapViewport
map
)
=>
DrawPointEx
(
g
,
point
,
symbol
,
symbolscale
,
offset
,
rotation
,
map
)
;
/// <summary>
/// Renders a point to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="point">Point to render</param>
/// <param name="symbol">Symbol to place over point</param>
/// <param name="symbolScale">The amount that the symbol should be scaled. A scale of '1' equals to no scaling</param>
/// <param name="offset">Symbol offset af scale=1</param>
/// <param name="rotation">Symbol rotation in degrees</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
RectangleF
DrawPointEx
(
Graphics
g
,
IPoint
point
,
Image
symbol
,
float
symbolScale
,
PointF
offset
,
float
rotation
,
MapViewport
map
)
{
if
(
point
==
null
)
return
RectangleF
.
Empty
;
if
(
symbol
==
null
)
//We have no point style - Use a default symbol
symbol
=
_defaultSymbol
;
var
pp
=
map
.
WorldToImage
(
point
.
Coordinate
)
;
float
width
=
symbol
.
Width
*
symbolScale
;
float
height
=
symbol
.
Height
*
symbolScale
;
float
left
=
pp
.
X
-
width
/
2
+
offset
.
X
*
symbolScale
;
float
top
=
pp
.
Y
-
height
/
2
+
offset
.
Y
*
symbolScale
;
Matrix
symTrans
=
null
;
Matrix
origTrans
=
null
;
if
(
rotation
!=
0
&&
!
Single
.
IsNaN
(
rotation
)
)
{
origTrans
=
g
.
Transform
.
Clone
(
)
;
using
(
var
t
=
g
.
Transform
.
Clone
(
)
)
{
t
.
RotateAt
(
rotation
,
pp
)
;
g
.
Transform
=
t
;
}
symTrans
=
new
Matrix
(
)
;
symTrans
.
RotateAt
(
rotation
,
pp
)
;
}
lock
(
symbol
)
{
g
.
DrawImage
(
symbol
,
left
,
top
,
width
,
height
)
;
}
if
(
origTrans
!=
null
)
{
g
.
Transform
=
origTrans
;
origTrans
.
Dispose
(
)
;
}
if
(
symTrans
==
null
)
return
new
RectangleF
(
left
,
top
,
width
,
height
)
;
var
pts
=
new
[
]
{
new
PointF
(
left
,
top
)
,
new
PointF
(
left
+
width
,
top
)
,
new
PointF
(
left
+
width
,
top
+
height
)
,
new
PointF
(
left
,
top
+
height
)
}
;
symTrans
.
TransformPoints
(
pts
)
;
symTrans
.
Dispose
(
)
;
return
pts
.
ToRectangleF
(
)
;
}
/// <summary>
/// Renders a <see cref="GeoAPI.Geometries.IMultiPoint"/> to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="points">MultiPoint to render</param>
/// <param name="symbol">Symbol to place over point</param>
/// <param name="symbolScale">The amount that the symbol should be scaled. A scale of '1' equals to no scaling</param>
/// <param name="offset">Symbol offset af scale=1</param>
/// <param name="rotation">Symbol rotation in degrees</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
void
DrawMultiPoint
(
Graphics
g
,
IMultiPoint
points
,
Image
symbol
,
float
symbolScale
,
PointF
offset
,
float
rotation
,
MapViewport
map
)
=>
DrawMultiPointEx
(
g
,
points
,
symbol
,
symbolScale
,
offset
,
rotation
,
map
)
;
/// <summary>
/// Renders a <see cref="GeoAPI.Geometries.IMultiPoint"/> to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="points">MultiPoint to render</param>
/// <param name="symbol">Symbol to place over point</param>
/// <param name="symbolScale">The amount that the symbol should be scaled. A scale of '1' equals to no scaling</param>
/// <param name="offset">Symbol offset af scale=1</param>
/// <param name="rotation">Symbol rotation in degrees</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
RectangleF
DrawMultiPointEx
(
Graphics
g
,
IMultiPoint
points
,
Image
symbol
,
float
symbolScale
,
PointF
offset
,
float
rotation
,
MapViewport
map
)
{
var
canvasArea
=
RectangleF
.
Empty
;
for
(
var
i
=
0
;
i
<
points
.
NumGeometries
;
i
++
)
{
var
rect
=
DrawPointEx
(
g
,
(
IPoint
)
points
[
i
]
,
symbol
,
symbolScale
,
offset
,
rotation
,
map
)
;
canvasArea
=
rect
.
ExpandToInclude
(
canvasArea
)
;
}
return
canvasArea
;
}
/// <summary>
/// Renders a <see cref="GeoAPI.Geometries.IMultiPoint"/> to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="points">MultiPoint to render</param>
/// <param name="symbolizer">Symbolizer to decorate point</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
void
DrawMultiPoint
(
IPointSymbolizer
symbolizer
,
Graphics
g
,
IMultiPoint
points
,
MapViewport
map
)
=>
DrawMultiPointEx
(
symbolizer
,
g
,
points
,
map
)
;
/// <summary>
/// Renders a <see cref="GeoAPI.Geometries.IMultiPoint"/> to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="points">MultiPoint to render</param>
/// <param name="symbolizer">Symbolizer to decorate point</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
RectangleF
DrawMultiPointEx
(
IPointSymbolizer
symbolizer
,
Graphics
g
,
IMultiPoint
points
,
MapViewport
map
)
{
symbolizer
.
Render
(
map
,
points
,
g
)
;
return
(
(
IPointSymbolizerEx
)
symbolizer
)
.
CanvasArea
;
}
/// <summary>
/// Renders a <see cref="GeoAPI.Geometries.IMultiPoint"/> to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="points">MultiPoint to render</param>
/// <param name="brush">Brush reference</param>
/// <param name="size">Size of drawn Point</param>
/// <param name="offset">Symbol offset af scale=1</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
void
DrawMultiPoint
(
Graphics
g
,
IMultiPoint
points
,
Brush
brush
,
float
size
,
PointF
offset
,
MapViewport
map
)
=>
DrawMultiPointEx
(
g
,
points
,
brush
,
size
,
offset
,
map
)
;
/// <summary>
/// Renders a <see cref="GeoAPI.Geometries.IMultiPoint"/> to the map.
/// </summary>
/// <param name="g">Graphics reference</param>
/// <param name="points">MultiPoint to render</param>
/// <param name="brush">Brush reference</param>
/// <param name="size">Size of drawn Point</param>
/// <param name="offset">Symbol offset af scale=1</param>
/// <param name="map">Map reference</param>
[
MethodImpl
(
MethodImplOptions
.
Synchronized
)
]
public
static
RectangleF
DrawMultiPointEx
(
Graphics
g
,
IMultiPoint
points
,
Brush
brush
,
float
size
,
PointF
offset
,
MapViewport
map
)
{
var
canvasArea
=
RectangleF
.
Empty
;
for
(
var
i
=
0
;
i
<
points
.
NumGeometries
;
i
++
)
{
var
point
=
(
IPoint
)
points
[
i
]
;
var
rect
=
DrawPointEx
(
g
,
point
,
brush
,
size
,
offset
,
map
)
;
canvasArea
=
rect
.
ExpandToInclude
(
canvasArea
)
;
}
return
canvasArea
;
}
#region Nested type: ClipState
private
enum
ClipState
{
Within
,
Outside
,
Intersecting
}
#endregion
/// <summary>
/// Equivalent of Envelope.ExpandToInclude, allowing for RectangleF.Empty
/// </summary>
/// <param name="self">The base rectangle</param>
/// <param name="other">The rectangle to include</param>
/// <returns></returns>
/// <remarks>
/// RectangleF.Union does not take into account RectangleF.Empty. For example,
/// when A = (0, 0; 0, 0) and B = (1, 1; 2, 2) then A.Union(B) = (0, 0; 2, 2)
/// </remarks>
internal
static
RectangleF
ExpandToInclude
(
this
RectangleF
self
,
RectangleF
other
)
{
if
(
other
.
IsEmpty
)
return
self
;
if
(
self
.
IsEmpty
)
return
other
;
return
RectangleF
.
FromLTRB
(
Math
.
Min
(
self
.
X
,
other
.
X
)
,
Math
.
Min
(
self
.
Y
,
other
.
Y
)
,
Math
.
Max
(
self
.
Right
,
other
.
Right
)
,
Math
.
Max
(
self
.
Bottom
,
other
.
Bottom
)
)
;
}
/// <summary>
/// Equivalent of Envelope.ExpandToInclude, allowing for Rectangle.Empty
/// </summary>
/// <param name="self">The base rectangle</param>
/// <param name="other">The rectangle to include</param>
/// <returns></returns>
/// <remarks>
/// Rectangle.Union does not take into account Rectangle.Empty. For example,
/// when A = (0, 0; 0, 0) and B = (1, 1; 2, 2) then A.Union(B) = (0, 0; 2, 2)
/// </remarks>
public
static
Rectangle
ExpandToInclude
(
this
Rectangle
self
,
Rectangle
other
)
{
if
(
other
.
IsEmpty
)
return
self
;
if
(
self
.
IsEmpty
)
return
other
;
return
Rectangle
.
FromLTRB
(
Math
.
Min
(
self
.
X
,
other
.
X
)
,
Math
.
Min
(
self
.
Y
,
other
.
Y
)
,
Math
.
Max
(
self
.
Right
,
other
.
Right
)
,
Math
.
Max
(
self
.
Bottom
,
other
.
Bottom
)
)
;
}
/// <summary>
/// Utility method to return Rectangle enclosing given RectangleF.
/// Top-left coordinate is rounded towards origin, while bottom-right coordinate is rounded away from origin.
/// </summary>
/// <param name="self"></param>
/// <returns></returns>
internal
static
Rectangle
ToRectangle
(
this
RectangleF
self
)
{
if
(
self
.
IsEmpty
)
return
Rectangle
.
Empty
;
return
Rectangle
.
FromLTRB
(
(
int
)
Math
.
Truncate
(
self
.
X
)
,
(
int
)
Math
.
Truncate
(
self
.
Y
)
,
(
int
)
Math
.
Ceiling
(
self
.
Right
)
,
(
int
)
Math
.
Ceiling
(
self
.
Bottom
)
)
;
}
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