问获取当前视口(Viewport)坐标值的函数
rt<br><br>
3x a lot！<br> 在ObjectARX Developer's
Guide 里找到了<br>
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<div class="TopHead" title="Example 3: Obtaining the Window Coordinates ">Example
3: Obtaining the Window Coordinates </div>
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<p class="body">This example shows the use of AcGiViewportDraw::polylineDc() and AcGiViewport::getViewportDcCorners() to obtain the display
coordinates of the <font style="background-color: rgb(10, 36, 106);" color="#ffffff">viewport</font>. This function is convenient when you are drawing
graphics that depend on the physical layout of the <font style="background-color: rgb(10, 36, 106);" color="#ffffff">viewport</font>, such as icons
and markers that vary with the size or borders of the <font style="background-color: rgb(10, 36, 106);" color="#ffffff">viewport</font>. The graphics
drawn will change with panning and zooming.
<p class="body">The example draws a box in the upper-right corner of the <font style="background-color: rgb(10, 36, 106);" color="#ffffff">viewport</font>. The box's width
and height are always one-tenth of the viewport's shortest dimension, and the
box is centered one-tenth of the viewport's shortest dimension down and to the
left of the upper-right-hand corner of the <font style="background-color: rgb(10, 36, 106);" color="#ffffff">viewport</font>:
<pre class="prog_in_0">void</pre>
<pre class="prog_in_0">AsdkIconSamp::viewportDraw(AcGiViewportDraw* pV)</pre>
<pre class="prog_in_end_0">{<br> // Get the current viewport's display coordinates.<br> //<br> AcGePoint2d lower_left, upper_right;<br> pV-><font style="background-color: rgb(10, 36, 106);" color="#ffffff">viewport</font>().getViewportDcCorners(lower_left, upper_right);<br> double xsize = upper_right.x - lower_left.x;<br> double ysize = upper_right.y - lower_left.y;<br> xsize /= 10.0;<br> ysize /= 10.0;<br> double xcenter = upper_right.x - xsize;<br> double ycenter = upper_right.y - ysize;<br> double half_xsize = xsize / 2.0;<br> double half_ysize = ysize / 2.0;<br> // Create a unit square.<br> //<br> const int num_verts = 5;<br> AcGePoint3d verts;<br> for (int i = 0; i < num_verts; i++) {<br> verts.x = xcenter;<br> verts.y = ycenter;<br> verts.z = 0.0;<br> }<br> verts.x -= half_xsize;<br> verts.y += half_ysize;<br> verts.x += half_xsize;<br> verts.y += half_ysize;<br> verts.x += half_xsize;<br> verts.y -= half_ysize;<br> verts.x -= half_xsize;<br> verts.y -= half_ysize;<br> verts = verts;<br> pV->subEntityTraits().setColor(kRed);<br> pV->geometry().polylineDc(num_verts, verts);<br>}</pre>
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