java rgb自动生成数组渐变色

前台渐变色

image.png

.linear-break{ 
                float: right;
                width: 100px;
                height:20px; 
                margin-right: 10px;
                border-radius: 5px;
                background: -webkit-linear-gradient(left,rgb(0, 200, 0),rgb(30,144,255),rgb(255, 0, 0)) no-repeat;
            } 

后台渐变色方法 step为分多少个颜色

image.png

//查看字符串是否在数组中(双色渐变)
    public static List getStepColorsByCondition(int[] beginColor, int[] endColor, int step) {
        List list = new ArrayList();
        list.add(intAryToString(beginColor));
        if(step > 1){
            step = step - 1;
        }else{
            return list;
        }
        for (int i = 1; i <= step; i++) {
            StringBuffer newColor = new StringBuffer();
            for (int j = 0; j < beginColor.length; j++) {
                int bca = beginColor[j];
                int eca = endColor[j];
                //这个就是算法，RGB三色都按同样的算法
                int newnum = bca + (eca - bca) / step*i;
                newColor.append(newnum + ",");
            }
            list.add(newColor.deleteCharAt(newColor.length()-1).toString());
        }
        return list;
    }

    //查看字符串是否在数组中(三色渐变)
    public static List getStepColorsByCondition(int[] beginColor, int[] midColor, int[] endColor, int step) {
        List list = new ArrayList();
        list.add(intAryToString(beginColor));
        int num1;
        int num2;
        if(step%2 == 0){
            num1 = num2 = step/2;
        }else{
            num1 = step/2+1;
            num2 = step - num1;
        }

        if(num1 > 1){
            num1 = num1 - 1;
        }
        for (int i = 1; i <= num1; i++) {
            StringBuffer newColor = new StringBuffer();
            for (int j = 0; j < beginColor.length; j++) {
                int bca = beginColor[j];
                int eca = midColor[j];
                //这个就是算法，RGB三色都按同样的算法
                int newnum = bca + (eca - bca) / num1*i;
                newColor.append(newnum + ",");
            }
            list.add(newColor.deleteCharAt(newColor.length()-1).toString());
        }

        for (int i = 1; i <= num2; i++) {
            StringBuffer newColor = new StringBuffer();
            for (int j = 0; j < midColor.length; j++) {
                int bca = midColor[j];
                int eca = endColor[j];
                //这个就是算法，RGB三色都按同样的算法
                int newnum = bca + (eca - bca) / num2*i;
                newColor.append(newnum + ",");
            }
            list.add(newColor.deleteCharAt(newColor.length()-1).toString());
        }
        return list;
    }

    public static void main(String[] args) {
        int[] beginColor = {0,200,0};
        int[] midColor = {0,0,255};
        int[] endColor = {255,0,0};
        List stepColorsBy = getStepColorsByCondition(beginColor, endColor, 3);
        System.out.println(JSON.toJSONString(stepColorsBy));

        List stepColorsByCondition = getStepColorsByCondition(beginColor, midColor, endColor, 12);
        System.out.println(JSON.toJSONString(stepColorsByCondition));
    }