Thanks for the sample on the mapping routine. Here is what I am looking for:
1. Load a map like in your sample.
2. Georefernce the map by tapping on 2 positions and entering the coordinates or the lats and longs.
3. Have zoom functions like in your other map sample.
4. Have basic drawing functions like a line, circle, etc.
5. Be able to plot bitmaps (like a car, etc.)
6. Connect a GPS which shows the position on the map and can plot your path as you move along.
7. Be able to store the path of your movement.
I will add the functionalities you need.
1) already done
2) no problem
3) no problem
4) partially done, do you need also drawing texts?
5) no problem, alraedy done in another program
6) 7) I don't have a GPS, so I won't be able to do it.
But it shouldn't be that complicated, I remember that alea46 on the french form has done someting in that direction.
Would you like me to continue with the ScaledMap program or would you like having it directly integrated in some of your code.
My suggstion is to move the ScaledMap code in a module so it would be relatively easy to integrate it in your code.
I have some more questions:
- What size, in pixels, are your map images ?
- What depth of zoom are you thinking of, this would or could depend on the image size ?
- Do you want the lines, circles and bitmaps directly been drawn onto the map image or onto the forelayer ? With the forelayer I am afraid that it would be complicated to combine both images afterwards.
- For the circles do you want to draw them with a given radius or do you want to determine the radius with the stylus rubberband style: point center- move for radius release draw. In that case, also for the lines, we must forget drawing onto the forelayer.
That's enough questions for the moment, will come back if there are other ones.
With regards to the pixel size of the map, this will depend on the type of map one will be loading and this will also have an influence on the zoom factor.
With the drawing functions can one not have an input box at the bottom or top of the screen where one can enter the parameters of the line or circle? For a line one will type in say 10,20,30,40 (startX, startY,endX,endY) and for a circle say 10,20,4 (centerX, centerY, radius). In this way the user can either draw with the stylus on the screen (and the parameters appear also in the input box) or type in the parameters.
Regarding the layer on which one draws or the path that gets plotted from data received from the GPS, can one not store this in a database so that the orginal map stays intact? One could then be able to load different "Data Files" which could then be plotted as an overlay on the map.
Hi Michael,
I have been continuing the program, exactly in the same direction as described in your post.
I will post a sample quite soon to make shure that it fits your needs, requirements and feeling.
Are the maps, always oriented north-south or can those have an angular orientation? If yes that means we need 3 points to scale the maps.
The map I included in the first version is a screen copy of Google Earth, and there there can be an angular orientations.
You are right, it is a good idea to georeference the map by specifying 3 points on the map just in case it is not orientated in a north-south direction.
Something one can also incoporate at a later stage is a "correction" that can be applied in case there is a scale error in the points that were used to georeference the maps.
Here is a first version of what the Map program could look like.
There remains of course functionalities to add and a lot to test.
I have not yet tested so much, but I would like first to have your feedback if it fits your needs, requirements and feelings.
What can be done:
- The map is at the moment fixed.
- The map can be scaled.
- Drawings can be made onto the map:
- Polylines, circles, texts and bitmaps.
For the circles, the radius can be defined (in pixels)
For the texts, those can be input.
The colors are selectable.
For the bitmaps, just two images are predifined in the program at the moment.
- Select any element of the drawing, no modifications possible yet, just the color.
- The scaling of the map needs more testing.
- Save and load drawings.
The saved data is just the geometry of the drawing elements, no reference to the map yet, will be improved.
What can not be done yet:
- Loading of different maps
- Loading of bitmaps to draw
- Modifications of drawing elements (coordinates).
- Scaling with 3 points
- Undo and redo doesn't work yet
A very very small help file is included.
Your comments for the progress of the program will be welcome.
As once promised, the color selection module is included.
Best regards, and merry Christmas to you and to All who read this post.
EDIT 2008.12.31 : Removed files, new version in post #10.
I would be pleased to have some feedback of what is missing, improvement suggestions and bug reports.
What can be done:
- Different maps can be loaded.
- The map can be scaled, and the scaling saved (two points only yet).
- Drawings can be made onto the maps: polylines, circles, texts and bitmaps.
- For the circles, the radius can be defined (in pixels)
- For the texts, those can be input and font size selected.
- The colors are selectable.
- For the bitmaps, four images are predifined in the program at the moment, these can be deleted and others loaded.
- Select any element of the drawing and modify it. To change the position of an element, click on it, move it and release, or change the values.
- Save and load drawings. The saved data is just the geometry of the drawing elements, with a reference to the map. To load drawings, the program shows only those belonging to the map.
What can not be done yet:
- Scaling with 3 points
- Undo and redo not yet implemented
- Calculate the length of a polyline
What is still missing:
- no config file
- no VGA support
- no multi language
- no GPS support
A very very small help file is included, because of size restrictions, will be more complete in the next version.
The next version will be posted in the Share Your Creations forum.
Mapping
Linear Mode
