Scalebar Rendering Problem
Steve Lime
Steve.Lime at DNR.STATE.MN.US
Mon Oct 23 10:24:01 PDT 2006
The process of embedding a scalebar actually creates a new layer in in
the mapfile
behind the scenes. This new layer is then used to draw the scalebar
image (as a
marker) within the map. What you're seeing is undoubtedly a bug. Could
you
file a bug report?
What version of MapServer are you using?
Steve
>>> Hong <ljfong at SDF.LONESTAR.ORG> 10/20/2006 2:02:23 PM >>>
Hello,
I am having trouble where the numbers below the scale bar seems to be
overdrawn rather than redrawn after the map is redrawn. The scale bar
is
embedded through C#-MapScript. The output format of my map is PNG with
image
mode PC256.
The portion of VB 2005 code I used to embed the scale bar:
Public Sub New()
m_Position = MS_LABEL_POSITIONS.MS_LL
m_scaleUnits = MS_UNITS.MS_MILES
'Actually create and position the scale bar object
m_scalebarObj = New scalebarObj
Dim p_labelObj As labelObj = New labelObj
p_labelObj.type = MS_FONT_TYPE.MS_BITMAP
p_labelObj.color = New colorObj(0, 0, 0, -4)
With m_scalebarObj
.label = p_labelObj
.backgroundcolor = New colorObj(255, 255, 255, -4)
.imagecolor = New colorObj(255, 255, 255, -4)
.intervals = 4
.postlabelcache = mapscript.MS_TRUE
.width = 150
.height = 10
.status = mapscript.MS_EMBED
.position = m_Position
.units = m_scaleUnits
End With
End Sub
m_scalebarObj is then attached to mapObj through scalebar
property.
Here are two screenshots of the scale bar:
http://ljfong.freeshell.org/scalebar_before_map_redraw.png
http://ljfong.freeshell.org/scalebar_after_map_redraw.png
I could use any suggestions here.
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