零碎（1）

 

1. Linux中常用的命令都是哪些单词的缩写？

知乎回答：

https://www.zhihu.com/question/49073893

其中一个回答(开源漫游指南)：

https://i.linuxtoy.org/docs/guide/ch02s02.html

 

2. 用javascript画出不同颜色的字~

 (KhanAcademy)

var Fanimals = ["Rabbit", "Cat", "Dog", "Snake", "Monkey"];
var count = 0;
while(count < Fanimals.length){
    fill(250, 200-count*30, 0);  //change the colors
    text(Fanimals[count], 10, (count+1)*15);  //change the text and the location
    count++;
}
text("My "+Fanimals.length+" Favorite Animals!!", 10, 100);

Results:

 之前没接触过，觉得很可爱呀!

 还能随手点出星星(不过这里的"space/star"离开这里应该就没有了):

var xPositions = [100, 300];
var yPositions = [200, 50];

var drawStars = function() {
    background(9, 5, 59);
    imageMode(CENTER);
    for (var i = 0; i < yPositions.length; i++) {
        image(getImage("space/star"), xPositions[i], yPositions[i], 30, 30);
    }
};
mouseClicked = function(){
    xPositions.push(mouseX);
    yPositions.push(mouseY);
    drawStars();
};

还可以下雪:

var xPositions = [200];
var yPositions = [0];

for(var num =0; num<25; num++){
    xPositions.push(random(10, 350));
    yPositions.push(random(0, 250));
}

draw = function() {
    background(204, 247, 255);
    stroke(235, 61, 235);
    for (var i = 0; i < xPositions.length; i++) {
        noStroke();
        fill(250, 250-pow(-1, floor(i)%3)*10, 250);
        if(i%4 !== 0){
            ellipse(xPositions[i], yPositions[i], 10, 10);
        }
        if(i%4 === 0){
            image(getImage("avatars/leaf-orange"), xPositions[i]-10, yPositions[i], 20, 20);
        }
        //control the falling speed
        if(i%3 === 0) {yPositions[i] += random(2,3);}
        else{yPositions[i] += random(3,5);}
        //control the positions they restart
        if(yPositions[i]>400){
            if(i%4 === 0){yPositions[i] = 0;}
            else{yPositions[i]=random(0, 50);}
        }
    }
    
};

mouseClicked = function(){
    xPositions.push(mouseX);
    yPositions.push(mouseY);
    draw();
};

mouseClicked();

附上丑图一张哈哈

做完排序(选择排序)任务之后还有个画图任务，不过对javascript不太熟，没想好怎么画比较好看，就画了个丑丑的，有空再修改!

线段是标记出元素换位的变化，每一行是每一步迭代的状态(在函数外部定义的变量是全局变量，在函数内部修改值也可以影响该变量的值):

var edgeL = 0; //for changing the leftest position
var edgeU = 0; //for changing the uppest position
var times = 0; //record the times plot was drawn
var wid = 15; //control the distance
var hei = 25; //control the distance
var offset_wid = 5; // adjust the position of the lines
var offset_hei_up = -20;
var offset_hei_down = 2;
var distance = 50; //the distance between blocks

var displayArray = function(array) {
    textFont(createFont("monospace"), 30);
    
};
var swap = function(array, firstIndex, secondIndex) {
    var temp = array[firstIndex];
    array[firstIndex] = array[secondIndex];
    array[secondIndex] = temp;
};

var indexOfMinimum = function(array, startIndex) {
    var minValue = array[startIndex];
    var minIndex = startIndex;

    for(var i = minIndex + 1; i < array.length; i++) {
        if(array[i] < minValue) {
            minIndex = i;
            minValue = array[i];
        }
    } 
    return minIndex;
}; 

var selectionSort = function(array) {
    fill(237, 179, 176);
    rect(15+edgeL, 15+edgeU, wid*(array.length+1), hei*(array.length+1));
    fill(240, 71, 53);
    var k =0;
    for(var i = 0; i < array.length; i++){
        for(var j = 0; j < array.length; j++){
            text(array[j], edgeL+25+wid*j, edgeU+45+hei*i);
        }
        k = indexOfMinimum(array, i);
        swap(array, k, i);
        stroke(105, 9, 24);
        if(i < array.length-1){
        line(25+wid*k+offset_wid+edgeL, 45+hei*i+offset_hei_down+edgeU, 25+wid*i+offset_wid+edgeL, 45+hei*(i+1)+offset_hei_up+edgeU);   
        }
    }
    times++;
    if(times%2 === 0) {edgeL = edgeL + distance+wid*array.length;}
    else {edgeU = edgeU + distance+hei*array.length;}
};

fill(250, 200, 100);
textSize(20);
var array_1 = [3, 2, 1, 4, 6, 0];
array_1 = selectionSort(array_1);

var array_2 = [1, 0, 4, 3, 7];
array_2 = selectionSort(array_2);

var array_3 = [1, 2, 3, 1, 2, 3];
array_3 = selectionSort(array_3);

var array_4 = [9, 9, 7, 0, 3, 1];
array_4 = selectionSort(array_4);