clamp method
void
clamp()
Implementation
void clamp() {
if (r < 0.0) {
r = 0.0;
} else if (r > 1) {
r = 1.0;
}
if (g < 0.0) {
g = 0.0;
} else if (g > 1) {
g = 1.0;
}
if (b < 0.0) {
b = 0.0;
} else if (b > 1) {
b = 1.0;
}
if (a < 0.0) {
a = 0.0;
} else if (a > 1) {
a = 1.0;
}
}