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→Basic Image Manipulation: typo
Line 510:
Line 510:
<source lang = "cpp">sprite.SetTransparency(sprite.GetTransparency()+5);</source>
<source lang = "cpp">sprite.SetTransparency(sprite.GetTransparency()+5);</source>
−This will call SetTransparency() and pass it the current alpha and increase it by a value of 5. The next two lines of code are more or less the same but the user must be pressing B and the images alpha must be greater than 4, if so then it will call SetTransparency() to decrease the current alpha by a value of 5. The reason that the alpha must be greater than (but not and equal to) is so that if the alpha vale is equal to 5 and it calls the SetTransparency() function then the current alpha value will be 0, if it were 0 and you were able to decreases the alpha value further you would have negative values (obviously) which won’t go down well with the program at all! Always make sure you have checks to stop values going below thresholds, the program will almost never do this for you so you must code your applications, games etc carefully to avoid these things.
+This will call SetTransparency() and pass it the current alpha and increase it by a value of 5. The next two lines of code are more or less the same but the user must be pressing B and the images alpha must be greater than 4, if so then it will call SetTransparency() to decrease the current alpha by a value of 5. The reason that the alpha must be greater than (but not and equal to) is so that if the alpha value is equal to 5 and it calls the SetTransparency() function then the current alpha value will be 0, if it were 0 and you were able to decreases the alpha value further you would have negative values (obviously) which won’t go down well with the program at all! Always make sure you have checks to stop values going below thresholds, the program will almost never do this for you so you must code your applications, games etc carefully to avoid these things.
That’s four functions down, let’s move onto the next two Get and Set functions.
That’s four functions down, let’s move onto the next two Get and Set functions.