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About to use gl instructions in a "c" program
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About to use gl instructions in a "c" program
by joluinfante
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Hi, forum.
I did modify the testmain.c (from openev project) to do a little georeferencing software. To complete it, I need draw a rectangle in the photo, to talk to the operator "what is the zone to process". But, I don't know what is the method to do it. I did try: gv_view_area_add_layer(GV_VIEW_AREA(view_raster), raster_layer); <--- this is my photo raster_point_layer=gv_shapes_layer_new(NULL); <--- this is a layer to put gv_data_set_name(GV_DATA(raster_point_layer), "photo_points"); <--- the gcp points gv_view_area_add_layer(GV_VIEW_AREA(view_raster), raster_point_layer); gv_view_area_set_active_layer(GV_VIEW_AREA(view_raster), raster_point_layer); <-- the layer -- is active glColor4f(1.0, 0.0, 0.0, 0.0); <--- I'll draw the rectangle with red color glBegin(GL_LINES); <--- I'll draw a lines to build the rectangle glVertex3(0.0, 0.0, 0.0); glVertex3(1000.0, 0.0, 0.0); glVertex3(1000.0, 1000.0, 0.0); glVertex3(0.0, 1000.0, 0.0); glVertex3(0.0, .0, 0.0); glEnd(); <--- End of draw glFlush(); <--- Is it neccesary? Then I don't see the rectangle in the view. I see the sources, and this method is used to draw a rectangle around the cursor position. Can any help me? Thanks a lot. jorge infante direccion de catastro municipalidad de rosario rosario - santa fe - argentina printf("2\n"); |
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Re: About to use gl instructions in a "c" program
by Sampson, David
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I had success by following the developers tutorial
http://openev.sourceforge.net/app/developer_info/DEVCOURSE_tutorial2.htm l If you have not run through this before I suggest taking a look at it. That's the extent to what I have to offer. Cheers -----Original Message----- From: openev-discuss-bounces@... [mailto:openev-discuss-bounces@...] On Behalf Of joluinfante Sent: July 20, 2007 14:58 To: openev-discuss@... Subject: [Openev-discuss] About to use gl instructions in a "c" program Hi, forum. I did modify the testmain.c (from openev project) to do a little georeferencing software. To complete it, I need draw a rectangle in the photo, to talk to the operator "what is the zone to process". But, I don't know what is the method to do it. I did try: gv_view_area_add_layer(GV_VIEW_AREA(view_raster), raster_layer); <--- this is my photo raster_point_layer=gv_shapes_layer_new(NULL); <--- this is a layer to put gv_data_set_name(GV_DATA(raster_point_layer), "photo_points"); <--- the gcp points gv_view_area_add_layer(GV_VIEW_AREA(view_raster), raster_point_layer); gv_view_area_set_active_layer(GV_VIEW_AREA(view_raster), raster_point_layer); <-- the layer -- is active glColor4f(1.0, 0.0, 0.0, 0.0); <--- I'll draw the rectangle with red color glBegin(GL_LINES); <--- I'll draw a lines to build the rectangle glVertex3(0.0, 0.0, 0.0); glVertex3(1000.0, 0.0, 0.0); glVertex3(1000.0, 1000.0, 0.0); glVertex3(0.0, 1000.0, 0.0); glVertex3(0.0, .0, 0.0); glEnd(); <--- End of draw glFlush(); <--- Is it neccesary? Then I don't see the rectangle in the view. I see the sources, and this method is used to draw a rectangle around the cursor position. Can any help me? Thanks a lot. jorge infante direccion de catastro municipalidad de rosario rosario - santa fe - argentina printf("2\n"); -- View this message in context: http://www.nabble.com/About-to-use-gl-instructions-in-a-%22c%22-program- tf4118607.html#a11712874 Sent from the openev-discuss mailing list archive at Nabble.com. ------------------------------------------------------------------------ - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Openev-discuss mailing list Openev-discuss@... https://lists.sourceforge.net/lists/listinfo/openev-discuss ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Openev-discuss mailing list Openev-discuss@... https://lists.sourceforge.net/lists/listinfo/openev-discuss |
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Re: About to use gl instructions in a "c" program
by joluinfante
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Thanks, David.
But, I can't to access to the address you tell me. I did receive the message: An error has been encountered in accessing this page. 1. Server: openev.sourceforge.net 2. URL path: /app/developer_info/DEVCOURSE_tutorial2.htm 3. Error notes: File does not exist: /home/groups/o/op/openev/htdocs/app/developer_info/DEVCOURSE_tutorial2.htm 4. Error type: 404 5. Request method: GET 6. Request query string: 7. Time: 2007-07-23 05:12:38 PDT (1185192758) Is ok the address? TIA jorge infante
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Re: About to use gl instructions in a "c" program
by Frank Warmerdam-2
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joluinfante wrote:
> Thanks, David. > But, I can't to access to the address you tell me. > I did receive the message: > An error has been encountered in accessing this page. Try entering it at: http://openev.sourceforge.net/app/developer_info/DEVCOURSE.html > > -- is active > glColor4f(1.0, 0.0, 0.0, 0.0); <--- I'll draw the rectangle with > red color > glBegin(GL_LINES); <--- I'll draw a lines to build > the rectangle > glVertex3(0.0, 0.0, 0.0); > glVertex3(1000.0, 0.0, 0.0); > glVertex3(1000.0, 1000.0, 0.0); > glVertex3(0.0, 1000.0, 0.0); > glVertex3(0.0, .0, 0.0); > glEnd(); <--- End of draw > glFlush(); <--- Is it neccesary? > > Then I don't see the rectangle in the view. Generally speaking you can't imperatively draw stuff in the mainline, because it will just get overwritten by the first redraw. If you want to show an area of interest of some sort, you might want to register a vector layer with just this vector object in it. Or at a low level, you could add your own expose callback after the system ones are done to drawn an overlay. I'd like to give more specific feedback but I'd have to do quite a bit work to come up with working example code. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@... light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | President OSGeo, http://osgeo.org ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Openev-discuss mailing list Openev-discuss@... https://lists.sourceforge.net/lists/listinfo/openev-discuss |
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