tips:dynamiccolor
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| tips:dynamiccolor [2015/01/28 05:38] – [Examples] rahul_pawa | tips:dynamiccolor [2015/01/28 05:43] – [Gradually Transition Color As Battery Drains, From Green to Yellow to Red] rahul_pawa | ||
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| - | {bl} > 66 and string.format(' | + | {bl} > 66 and string.format(' |
| - | Here again we are using a condition to set the color value of an object, this time the condition is {bl} > 66, and the value we get is a function of the battery level: string.format(' | + | Here again we are using a condition to set the color value of an object, this time the condition is {bl} > 66, and the value we get is a function of the battery level: string.format(' |
| - | The string.format function is how you build a string in LUA. I am using it here to convert the decimal number generated by the formula (100-{bl})*255/ | + | The string.format function is how you build a string in LUA. I am using it here to convert the decimal number generated by the formula (100-{bl})*255/ |
| - | Let's talk about that first argument, you always need something like this when you use string.format. It always needs the single quotes (' '), and in those quotes is a code that tells LUA what our string will look like. In this case, %x tells it the first thing in our string will be a hexadecimal number, and %s tells us it will be followed by a string (some letters or numbers). The formatting here is also important, note that there is no space between %x and %s, this tells LUA that there shouldn' | + | Let's talk about that first argument, you always need something like this when you use string.format. It always needs the single quotes (' '), and in those quotes is a code that tells LUA what our string will look like. In this case, %.2x tells it the first thing in our string will be a 2 digit hexadecimal number, and %s tells us it will be followed by a string (some letters or numbers). The formatting here is also important, note that there is no space between %.2x and %s, this tells LUA that there shouldn' |
| - | The second argument is a linear formula that uses the battery level as its variable. It correlates to the %x in the first argument. The formula itself is: (100-{bl})*255/ | + | The second argument is a linear formula that uses the battery level as its variable. It correlates to the %.2x in the first argument. The formula itself is: (100-{bl})*255/ |
| The third argument is a string that is simply the rest of the color code, in this case I want maximum green and no blue. | The third argument is a string that is simply the rest of the color code, in this case I want maximum green and no blue. | ||
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| There is similar code in the second condition to transition from yellow to red when the battery level is between 16 and 66: | There is similar code in the second condition to transition from yellow to red when the battery level is between 16 and 66: | ||
| - | {bl} > 16 and string.format(' | + | {bl} > 16 and string.format(' |
| In the above you should note there are now four arguments in the string.format function. The three codes each correspond to arguments 2-4 in order. The formula has changed a little because I am using a bigger range, I've decided that I want the gradual transition from yellow to red to start at battery level = 66, and end at battery level = 16. | In the above you should note there are now four arguments in the string.format function. The three codes each correspond to arguments 2-4 in order. The formula has changed a little because I am using a bigger range, I've decided that I want the gradual transition from yellow to red to start at battery level = 66, and end at battery level = 16. | ||
tips/dynamiccolor.txt · Last modified: 2016/07/05 19:32 by wmissimer