c ++ 颜色之间的淡入淡出?(阿杜诺) [英] c++ Fade between colors? (Arduino)
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问题描述
我目前有这两种颜色之间的渐变:
I currently have this thats fading between 2 set colours:
for(int i=0;i<nLEDs;i++){
a = (255 / 100) * (incomingByte * sensitivity);
r = (r * 7 + a + 7) / 8;
g = (g * 7 + (255 - a) + 7) / 8;
b = 0;
FTLEDColour col = { r , g , b };
led.setLED(i, col);
}
但现在我试图允许用户输入他们自己的颜色:
But now im trying to allow users to enter their own colours:
// > Colour fade, Start colour
int colFade1Red = 0;
int colFade1Green = 255;
int colFade1Blue = 0;
// > Colour fade, End colour
int colFade2Red = 255;
int colFade2Green = 0;
int colFade2Blue = 0;
int fadeAm = 7; // Fade speed
带有淡入淡出的代码:
void ColourFade(){
for(int i=0;i<nLEDs;i++){
r = ctest(colFade1Red, colFade2Red, r);
g = ctest(colFade1Green, colFade2Green, g);
b = ctest(colFade1Blue, colFade2Blue, b);
FTLEDColour col = { r , g , b };
led.setLED(i, col);
}
}
int ctest(int col1, int col2, int cur){
int temp = col1 - col2;
if(temp < 0) { temp = -temp; }
int alp = (temp / 100) * (incomingByte * sensitivity);
if(col1 < col2){
return (cur * fadeAm + (col2 - alp) + fadeAm) / (fadeAm +1 );
} else {
return (cur * fadeAm + alp + fadeAm) / (fadeAm +1 );
}
}
但是这从第二个用户颜色开始并逐渐变成粉红色.我如何正确地淡化颜色?
But this starts with the Second user colour and fades into pink. How would I fade colours properly?
还有incomingByte"是0到100之间的值,代码在更新循环中.
Also "incomingByte" is a value between 0 and 100, and the code is in a update loop.
推荐答案
uint8_t clrR = abs(255 * cos(<some var that changes in time>));
同样适用于 clrB &clrG
same for clrB & clrG
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