Welcome to the real World! (The first sentence that Neo heard when he woke up)
WithMap editorAndWeb EngineLater, the Symbian version of the engine also came out (don't come out, the bear will cut me down :().
The code you just wrote is currently not using Double-Buffer and DSA, so the rendering speed is slow.
Source code download
To avoid this, copy the following resource files to the folder on the right.
.. /Data/1.png/epoc32/winscw/c/resource/apps/E51BEF1E/1.png .. /data/1.png. mapinfoc/epoc32/winscw/c/resource/apps/E51BEF1E/1.png. mapinfoc .. /data/2.png/epoc32/winscw/c/resource/apps/E51BEF1E/2.png .. /data/3.png/epoc32/winscw/c/resource/apps/E51BEF1E/3.png .. /data/4.png/epoc32/winscw/c/resource/apps/E51BEF1E/4.png .. /data/2.png. mapinfoc/epoc32/winscw/c/resource/apps/E51BEF1E/2.png. mapinfoc .. /data/3.png. mapinfoc/epoc32/winscw/c/resource/apps/E51BEF1E/3.png. mapinfoc .. /data/4.png. mapinfoc/epoc32/winscw/c/resource/apps/E51BEF1E/4.png. mapinfoc .. /data/1. rcmap/epoc32/winscw/c/resource/apps/E51BEF1E/1. rcmap
Next, let's take a look at the idea of improving map piecing. It's slow to use matrix + layer to display images on mobile phones...