Post by johnno56 on Sept 29, 2019 3:51:29 GMT -6
"In the beginning..." Relax. This is NOT a sermon.
I think, way back in QBasic's earliest version, colour was anything but pretty. Compared to black and white, I suppose it could be, but no it wasn't.
QB had four colours. Black, white, cyan and magenta.
Most modern "Basics" now use RGB(). The rgb() function define colours using the Red-Green-Blue (RGB) model.
An RGB colour value is specified with: rgb(red, green, blue). Each parameter defines the intensity of that colour and can be an integer between 0 and 255.
For example, the rgb(0,0,255) value is rendered as blue, because the blue parameter is set to its highest value (255) and the others are set to 0.
RGB() can render a possible 16,777,216 colours! (256 x 256 x 256)... Cool...
Although the attached program is not a tutorial per se, it demonstrates how the RGB model works.
Keys A and Z with change the RED value.
Keys S ans X will change the GREEN value.
Keys D and C will change the BLUE value.
The resulting combinations of red, green and blue will be displayed along with its RGB values.
rgbguide.zip (187.43 KB)
How to define a colour in your program?
Use the command: setColor()
SetColor uses only one parameter.
It can be used like:
setColor(rgb(255,255,255)) - for the colour White - or
white = rgb(255,255,255)
setColor(white)
I hope that this lesson will be of some use...
I think, way back in QBasic's earliest version, colour was anything but pretty. Compared to black and white, I suppose it could be, but no it wasn't.
QB had four colours. Black, white, cyan and magenta.
Most modern "Basics" now use RGB(). The rgb() function define colours using the Red-Green-Blue (RGB) model.
An RGB colour value is specified with: rgb(red, green, blue). Each parameter defines the intensity of that colour and can be an integer between 0 and 255.
For example, the rgb(0,0,255) value is rendered as blue, because the blue parameter is set to its highest value (255) and the others are set to 0.
RGB() can render a possible 16,777,216 colours! (256 x 256 x 256)... Cool...
Although the attached program is not a tutorial per se, it demonstrates how the RGB model works.
Keys A and Z with change the RED value.
Keys S ans X will change the GREEN value.
Keys D and C will change the BLUE value.
The resulting combinations of red, green and blue will be displayed along with its RGB values.
rgbguide.zip (187.43 KB)
How to define a colour in your program?
Use the command: setColor()
SetColor uses only one parameter.
It can be used like:
setColor(rgb(255,255,255)) - for the colour White - or
white = rgb(255,255,255)
setColor(white)
I hope that this lesson will be of some use...
