颜色渐变基本算法

// 3颜色等比线性变换
int startColor = COLORS[colorType][0];
int endColor = COLORS[colorType][1];
int delaR = [AColor getRed:endColor] - [AColor getRed:startColor];
int delaG = [AColor getGreen:endColor] - [AColor getGreen:startColor];
int delaB = [AColor getBlue:endColor] -  [AColor getBlue:startColor];
LONG delaTime = SYS_TIME - publicVoiceTimeCount;
float rate = delaTime * 1.0f / (PublicVoice_TIME); // 0 - 1
int curColor = [AColor getRGB:[AColor getRed:startColor] + delaR * rate
                            g:[AColor getGreen:startColor] + delaG * rate
                            b:[AColor getBlue:startColor] + delaB * rate];  

原来准备用这个做喇叭喊话的，但是由于渐变过度太平滑，效果不好，后来改成6颜色闪烁效果。

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// 闪烁效果
int colors[6] = {
    COLORS[colorType][0],
    COLORS[colorType][1],
    COLORS[colorType][2],
    COLORS[colorType][3],
    COLORS[colorType][2],
    COLORS[colorType][1]};
int _colorCount = (SYS_TIME - publicVoiceTimeCount) / 100; // 1000/100s一变
if (_colorCount > colorCount) {
    colorCount = _colorCount;
    int index = _colorCount % 6;
    int curColor = colors[index]; }