1. Total beginner can't work out how to read a colour from screen
#661
Posted by: 2002-11-20 09:39:18
I am new to Rapid Q but was familiar with BBC BASIC years ago. I need to write a screen compression routine for black and white bitmaps. The documentation states that PAINT (x%,y%,c%) is R/W and I can do the write part but how do you read c%? I am getting desparate :( Help would be appreciated.
Thanks for advice. I thought it would be a simple answer. I was looking at the Paint comand and had completely missed the pixel. I am using GUI btw I had spotted PEEK & POKE in Console. As I mentioned I used BBC BASIC there all peek/poke etc was handled with indirection operators -? -for a byte, ! for 4 bytes, the position of the operator determined read or write. With BBC Assembler though you could read a value by specifically using X% Y% etc to read 6502 registers wheras any other value would be written to it.... I think. It was a long time ago! Since then I have endured a bike crash where I damaged my brain. broke my back too but I seem ok now... almost. Thanks again.
Sorry to hear your bike crash -- China is also a kingdom of bikes.
Although use Rapid-Q to operate pixel is very very easy to code, the execution speed is obviously a disadvantage. If that's a problem for you, you may try RQASM.
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1. Total beginner can't work out how to read a colour from screen
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