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− | <H3>
| + | --[[利用者:Sanak|Sanak]] 2009年10月4日 (日) 08:09 (UTC)このページは削除予定です。 |
− | Labels Tab
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− | </H3>
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− | <P>
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− | The Labels tab allows you to enable labeling features and control a number of
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− | options related to fonts, placement, style, alignment and buffering.
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− | <P>
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− | We will illustrate this by labelling the lakes shapefile of the
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− | qgis_example_dataset:
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− | <P>
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− | <OL>
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− | <LI>Load the Shapefile alaska.shp and GML file lakes.gml in QGIS.
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− | </LI>
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− | <LI>Zoom in a bit to your favorite area with some lake.
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− | </LI>
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− | <LI>Make the lakes layer active.
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− | </LI>
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− | <LI>Open the Layer Properties dialog.
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− | </LI>
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− | <LI>Click on the Labels tab.
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− | </LI>
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− | <LI>Check the Display labels checkbox to enable labeling.
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− | </LI>
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− | <LI>Choose the field to label with.
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− | We'll use Field containing labelNAMES.
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− | </LI>
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− | <LI>Enter a default for lakes that have no name. The default label will be
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− | used each time QGIS encounters a lake with no value in the NAMES field.
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− | </LI>
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− | <LI>If have labels extending over several lines, check Multiline labels?.
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− | QGIS will check for a true line return in your label field and insert the line breaks accordingly.
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− | A true line return is a <SPAN CLASS="textbf">single</SPAN> character \n,
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− | (not two separate characters, like a backlash \ followed by the character n). | + | |
− | </LI>
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− | <LI>Click Apply.
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− | </LI>
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− | </OL>
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− | <P>
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− | Now we have labels. How do they look? They are probably too big and poorly
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− | placed in relation to the marker symbol for the lakes.
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− | <P>
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− | Select the Font entry and use the Font and Color
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− | buttons to set the font and color. You can also change the angle and the
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− | placement of the text-label.
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− | <P>
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− | To change the position of the text relative to the feature:
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− | <P>
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− | | + | |
− | <OL>
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− | <LI>Click on the Font entry.
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− | </LI>
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− | <LI>Change the placement by selecting one of the radio buttons
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− | in the Placement group. To fix our labels, choose the
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− | Right radio button.
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− | </LI>
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− | <LI>the Font size units allows you to select between
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− | Points or Map units.
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− | </LI>
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− | <LI>Click Apply to see your changes without closing the dialog.
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− | </LI>
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− | </OL>
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− | <P>
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− | Things are looking better, but the labels are still too close to the marker. To
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− | fix this we can use the options on the Position entry. Here we can add
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− | offsets for the X and Y directions. Adding an X offset of 5 will move our
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− | labels off the marker and make them more readable. Of course if your marker
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− | symbol or font is larger, more of an offset will be required.
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− | <P>
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− | The last adjustment we'll make is to buffer the labels. This just means
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− | putting a backdrop around them to make them stand out better. To buffer the
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− | lakes labels:
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− | <P>
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− | <OL>
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− | <LI>Click the Buffer tab.
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− | </LI>
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− | <LI>Click the Buffer Labels? checkbox to enable buffering.
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− | </LI>
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− | <LI>Choose a size for the buffer using the spin box.
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− | </LI>
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− | <LI>Choose a color by clicking on Color and choosing your
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− | favorite from the color selector. You can also set some transparency for the
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− | buffer if you prefer.
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− | </LI>
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− | <LI>Click Apply to see if you like the changes.
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− | </LI>
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− | </OL>
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− | <P>
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− | If you aren't happy with the results, tweak the settings and then test again
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− | by clicking Apply.
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− | <P>
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− | A buffer of 1 points seems to give a good result.
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− | Notice you can also specify the buffer size in map units if that works out
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− | better for you.
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− | <P>
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− | The remaining entries inside the Label tab allow you control the appearance of the
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− | labels using attributes stored in the layer. The entries beginning with Data defined allow you to
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− | set all the parameters for the labels using fields in the layer.
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− | <P>
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− | Not that the Label tab provides a preview-box where your
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− | selected label is shown.
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