分享用canvas實現水流和水池動畫的程式碼
- 零下一度原創
- 2017-05-17 14:28:126174瀏覽
利用Html 5的canvas標籤繪製水流和水池動畫
#在利用HTML 5的canvas進行動畫繪製之前，先介紹一下基本知識，包括canvas（如果對canvas比較熟悉的可以直接跳過該節）、oCanvas框架、精靈動畫。在了解了以上的基本知識後，就可以開始利用canvas做動畫了。
canvas標籤簡介
在這部分，東西比較多，比較雜，各個網站上都可以找到相關的簡介，在此我就不造輪子了，菜鳥上的教程就挺不錯的，另外推薦一個相當好的博文玩轉html 5 canvas畫圖,這篇文章介紹的非常詳細，推薦好好看看。
canvas框架oCanvas簡介
canvas標籤功能非常強大，既可以處理圖片，又可以進行像素級的處理，完全可以取代瀏覽器端的flash，但是由於canvas發展還未完善，API還不是太全，元素的事件處理功能等還沒有提供接口，在實現一些複雜功能時，尚需耗費許多精力，於是出現了許多第三方的基於canvas 的框架，這些框架相比於原生的canvas標籤，有了更多簡單易用的API，大大提高了我們編碼的效率，在這裡我選用的是oCanvas框架，相關的使用文檔和demo都可以去上面的鏈接中查看。
精靈動畫簡介
精靈動畫一般由一組自訂的屬性值和3個子函數組成（init、advance、draw）。
三個函數的作用分別如下：
init：初始化精靈動畫的屬性值
advance：再畫下一幀之前先更新下一幀的狀態值
draw：將advance函數中更新的狀態值繪製到畫布中
以上三個函數的執行順序是：init->advance->draw->advance->draw->…..一直循環下去。下面我以一個隨機產生上升氣泡的例子來說明上面的執行過程。
var constructor_bubble = function (settings, core) {
return oCanvas.extend({
core: core,
shapeType: "rectangular",//下面定义了上面我们提到的三个函数：init(),advance(),draw()//在init中，我们map对象组、一个空的数组和一个代表高度的属性值
init: function () {
this.map=[
{r:2,speed:3},
{r:3,speed:3},
{r:4,speed:3},
{r:5,speed:3},
{r:6,speed:3},
{r:7,speed:3},
{r:8,speed:3},
{r:9,speed:3},
{r:10,speed:3}
]; this.points=[]; this.height=this.container.height_now;
},//下面是advance函数，在函数中我们利用if逻辑判断是否添加新的气泡以及进行气泡的位置更新，points数组利用队列的先进先出来存储气泡的
advance: function () {
this.height=this.container.height_now; if(Math.random()>0.95){ var new_point={
x:this.start.x+this.offset*2*(Math.random()-0.5),
y:this.start.y-this.map[0].r,
r:this.map[0].r
}; this.points.push(new_point);
} if(this.points.length>0){ for(var i=0;i<this.points.length;i++){ this.points[i].x+=this.offset*2*(Math.random()-0.5); this.points[i].y-=3; if(this.start.y-this.points[i].y>this.height-this.points[i].r-33){ this.points.shift();
}
}
}
},//draw函数中，利用canvas的圆弧绘制指令，将points数组中存储的气泡依次画出
draw: function () {
var canvas = this.core.canvas;
canvas.lineJoin = 'round';
canvas.lineWidth = this.GDwidth;
canvas.strokeStyle = "#fff"; if(this.points.length>0){ for(var i=0;i<this.points.length;i++){
canvas.beginPath();
canvas.arc(this.points[i].x,this.points[i].y,5,0,2*Math.PI);
canvas.stroke();
canvas.closePath();
}
}
}
}, settings);
};
oCanvas.registerDisplayObject("bubble", constructor_bubble, "init");//下面是在应用中定义和添加上面定义的精灵动画，其中：start数组代表了气泡的产生点，container代表了气泡的存在区域var pp1=canvas.display.bubble({
start:{x:425,y:566},
container:SC02,
width:50,
offset:1,
speed:5
}).add();水流和水池動畫實現
下面詳細介紹一下，專案中如何實現水流動畫和水池動畫的詳細步驟：
水池動畫的繪製
var constructor_show = function (settings, core) {
return oCanvas.extend({
core: core,
shapeType: "rectangular",//上面四行都是oCanvas框架的结构语法/*下面init()、advance（）、draw()分别是上节中说的动画精灵三元素，第一个用来初始化，第二个用来
更新操作，第三个用来绘制图像/动画在管道对象中，定义了一些属性，包括：x、y、height、width、start、
height_now、full、speed、fill、trail_flag、[trail]。其中x、y分别代表水池参考点相对画布左
上角的位置，height、width是水池的宽高属性，start表征了动画是否开始，height_now代表了水池中水
位的高度，full表征了水池是否填满，speed水池上涨的速度，fill水的颜色，trail_flag表征了该水池
是否是一个标准的矩形，如果不是的话，配合trail属性，指定水池的轮廓*/
init: function () {
//默认动画关闭，水池full为0，当前高度为0
this.start=0; this.full=0; this.height_now=0;
},
advance: function () {
//如果水池未满并且是开启状态，水位未满就更新当前高度，否则将full置为1
if(this.start==1&&this.full!=1){ if (this.height_now < this.Height) { this.height_now += this.speed;
} else { this.full = 1;
}
}
},
draw: function () {
var canvas = this.core.canvas, //先获得水池的位置
origin = this.getOrigin(),
x = this.abs_x - origin.x,
y = this.abs_y - origin.y; //开始绘制
canvas.beginPath();
canvas.strokeStyle = "#000"; if (this.trail_flag == 1) { //如果是不规则图形，描出轮廓
canvas.moveTo(this.trail[0].x_t, this.trail[0].y_t); for (var i = 1; i < this.trail.length; i++) {
canvas.lineTo(this.trail[i].x_t, this.trail[i].y_t);
}
canvas.lineTo(this.trail[0].x_t, this.trail[0].y_t);
canvas.clip();
} if (this.fill !== "") { //设置颜色，绘制矩形水池
canvas.fillStyle = this.fill;
canvas.fillRect(x, y + this.Height - this.height_now, this.Width, this.height_now);
}
canvas.closePath();
}
}, settings);
};//将上面的动画精灵注册进oCanvas的display图形库中oCanvas.registerDisplayObject("SC_show", constructor_show, "init"); 管道水流動畫的繪製
在管道水流模型中，定義了以下的屬性：
destination: 目前水流最前端的位置
cells: 管道路徑陣列
deta: 方向斜邊長
deta_x: 方向x邊長
deta_y: 方向y邊長
flag_x: 餘弦值
flag_y:正弦值
cellIndex: 目前繪製邊的index
Speed: 水流速度
GDwidth:水流寬度
LineHeight:水流長度
x_now: 目前繪製點x座標
y_now: 目前繪製點y座標
firstX: 管道第一個點座標x
firstY: 管道第一個點座標y
beginHeight: 第一段水流的起點位置
endHeight: 上一段管道遺留未畫完的水線
legacyHeight: 最前端點在上一個管道留下的長度
paused: 是否開始
fill:水流顏色
full:是否填滿
init函數
//init函数主要完成初始化工作init: function () {
this.x_now = this.cells[0].x_cell;
this.y_now = this.cells[0].y_cell;
this.firstX = this.x_now;
this.firstY = this.y_now;
this.endHeight = 0;
this.beginHeight = 0;
this.paused=0;
this.full=0;
this.cellIndex = 0;
this.destination.x_d = this.cells[0].x_cell;
this.destination.y_d = this.cells[0].y_cell;
this.legacyHeight = -1;
this.LineHeight=10;
this.Speed=2*this.LineHeight/20;
} advance函數
//advance函数主要实现每次动画的刷新步进操作
advance: function () {
if(this.paused==1){
if (this.cellIndex < this.cells.length - 1) {
this.deta_x = this.cells[this.cellIndex + 1].x_cell - this.cells[this.cellIndex].x_cell;
this.deta_y = this.cells[this.cellIndex + 1].y_cell - this.cells[this.cellIndex].y_cell;
this.deta = Math.sqrt(this.deta_x * this.deta_x + this.deta_y * this.deta_y);
this.flag_x = this.deta_x / this.deta;
this.flag_y = this.deta_y / this.deta;
if (this.legacyHeight >= 0) {
this.cellIndex++;
if (this.cellIndex < this.cells.length - 1) {
this.deta_x = this.cells[this.cellIndex + 1].x_cell - this.cells[this.cellIndex].x_cell;
this.deta_y = this.cells[this.cellIndex + 1].y_cell - this.cells[this.cellIndex].y_cell;
this.deta = Math.sqrt(this.deta_x * this.deta_x + this.deta_y * this.deta_y);
this.flag_x = this.deta_x / this.deta;
this.flag_y = this.deta_y / this.deta;
this.destination.x_d = this.cells[this.cellIndex].x_cell + this.flag_x * this.legacyHeight;
this.destination.y_d = this.cells[this.cellIndex].y_cell + this.flag_y * this.legacyHeight;
if (Math.abs(this.destination.x_d - this.cells[this.cellIndex + 1].x_cell) > this.Speed * Math.abs(this.flag_x) || Math.abs(this.destination.y_d - this.cells[this.cellIndex + 1].y_cell) > this.Speed * Math.abs(this.flag_y)) {
this.legacyHeight = -1;
this.destination.x_d += this.flag_x * this.Speed;
this.destination.y_d += this.flag_y * this.Speed;
}
else {
if (this.flag_x == 0) {
this.legacyHeight = this.Speed - Math.abs(this.destination.y_d - this.cells[this.cellIndex + 1].y_cell) / Math.abs(this.flag_y);
}
else {
this.legacyHeight = this.Speed - Math.abs(this.destination.x_d - this.cells[this.cellIndex + 1].x_cell) / Math.abs(this.flag_x);
}
}
}
}
else {
this.destination.x_d += this.flag_x * this.Speed;
this.destination.y_d += this.flag_y * this.Speed;
if (Math.abs(this.destination.x_d - this.cells[this.cellIndex + 1].x_cell) >= this.Speed * Math.abs(this.flag_x) && Math.abs(this.destination.y_d - this.cells[this.cellIndex + 1].y_cell) >= this.Speed * Math.abs(this.flag_y)) {
this.legacyHeight = -1;
}
else {
if (this.flag_x == 0) {
this.legacyHeight = this.Speed - Math.abs(this.destination.y_d - this.cells[this.cellIndex + 1].y_cell) / Math.abs(this.flag_y);
}
else {
this.legacyHeight = this.Speed - Math.abs(this.destination.x_d - this.cells[this.cellIndex + 1].x_cell) / Math.abs(this.flag_x);
}
}
}
}else{
this.full=1;
}
this.deta_x = this.cells[1].x_cell - this.cells[0].x_cell;
this.deta_y = this.cells[1].y_cell - this.cells[0].y_cell;
this.deta = Math.sqrt(this.deta_x * this.deta_x + this.deta_y * this.deta_y);
this.flag_x = this.deta_x / this.deta;
this.flag_y = this.deta_y / this.deta;
if (this.paused == 1) {
if (Math.abs(this.firstX - this.cells[0].x_cell) >= this.LineHeight * Math.abs(this.flag_x) && Math.abs(this.firstY - this.cells[0].y_cell) >= this.LineHeight * Math.abs(this.flag_y)) {
this.firstX = this.cells[0].x_cell;
this.firstY = this.cells[0].y_cell;
this.beginHeight = 0;
}
else {
if (this.beginHeight < this.LineHeight) {
if (this.beginHeight + this.Speed >= this.LineHeight) {
this.beginHeight = this.LineHeight;
}
else {
this.beginHeight += this.Speed;
}
this.firstX = this.cells[0].x_cell;
this.firstY = this.cells[0].y_cell;
}
else if (this.beginHeight == this.LineHeight) {
this.firstX += this.flag_x * this.Speed;
this.firstY += this.flag_y * this.Speed;
}
}
}
}
}draw函數
//draw函数在每次advance之后执行，将每次的步进更新重新绘制到画布上
draw: function () {
var canvas = this.core.canvas; this.x_now = this.firstX; this.y_now = this.firstY; this.deta_x = this.cells[1].x_cell - this.cells[0].x_cell; this.deta_y = this.cells[1].y_cell - this.cells[0].y_cell; this.deta = Math.sqrt(this.deta_x * this.deta_x + this.deta_y * this.deta_y); var myEnd = false; this.flag_x = this.deta_x / this.deta; this.flag_y = this.deta_y / this.deta;
canvas.beginPath();
canvas.lineJoin = 'round';
canvas.lineCap="round"; this.endHeight = 0;
canvas.lineWidth = this.GDwidth / 4;
canvas.strokeStyle = this.fill; if (this.beginHeight > 0) {
canvas.moveTo(this.x_now, this.y_now);
canvas.lineTo(this.x_now + this.flag_x * this.beginHeight, this.y_now + this.flag_y * this.beginHeight);
} this.x_now += this.flag_x * (this.beginHeight + this.LineHeight); this.y_now += this.flag_y * (this.beginHeight + this.LineHeight); for (var i = 1; i <= this.cellIndex; i++) {
myEnd = false; this.deta_x = this.cells[i].x_cell - this.cells[i - 1].x_cell; this.deta_y = this.cells[i].y_cell - this.cells[i - 1].y_cell; this.deta = Math.sqrt(this.deta_x * this.deta_x + this.deta_y * this.deta_y); this.flag_x = this.deta_x / this.deta; this.flag_y = this.deta_y / this.deta; if (this.endHeight > 0) {
canvas.moveTo(this.cells[i - 1].x_cell, this.cells[i - 1].y_cell);
canvas.lineTo(this.cells[i - 1].x_cell + this.flag_x * (this.endHeight ), this.cells[i - 1].y_cell + this.flag_y * this.endHeight); this.x_now = this.cells[i - 1].x_cell + this.flag_x * (this.LineHeight + this.endHeight); this.y_now = this.cells[i - 1].y_cell + this.flag_y * (this.LineHeight + this.endHeight);
} if (this.endHeight < 0) { this.endHeight = Math.abs(this.endHeight); this.x_now = this.cells[i - 1].x_cell + this.flag_x * (this.endHeight); this.y_now = this.cells[i - 1].y_cell + this.flag_y * (this.endHeight);
} if (this.endHeight == 0 && i != 1) { this.x_now = this.cells[i - 1].x_cell; this.y_now = this.cells[i - 1].y_cell;
} while (Math.abs(this.x_now - this.cells[i].x_cell) >= this.LineHeight * Math.abs(this.flag_x) && Math.abs(this.y_now - this.cells[i].y_cell) >= this.LineHeight * Math.abs(this.flag_y)) {
canvas.moveTo(this.x_now, this.y_now);
canvas.lineTo(this.x_now + this.flag_x * this.LineHeight, this.y_now + this.flag_y * this.LineHeight); this.x_now += this.flag_x * this.LineHeight; this.y_now += this.flag_y * this.LineHeight; if (Math.abs(this.x_now - this.cells[i].x_cell) <= this.LineHeight * Math.abs(this.flag_x) && Math.abs(this.y_now - this.cells[i].y_cell) <= this.LineHeight * Math.abs(this.flag_y)) { if (this.flag_x == 0) { this.endHeight = Math.abs(this.y_now - this.cells[i].y_cell) / Math.abs(this.flag_y) - this.LineHeight;
} else { this.endHeight = Math.abs(this.x_now - this.cells[i].x_cell) / Math.abs(this.flag_x) - this.LineHeight;
} //this.endHeight = (Math.abs(this.y_now - this.cells[i].y_cell) + Math.abs(this.x_now - this.cells[i].x_cell) - this.LineHeight * (Math.abs(this.flag_y) + Math.abs(this.flag_x)))/2;
myEnd = true; break;
} else { this.x_now += this.flag_x * this.LineHeight; this.y_now += this.flag_y * this.LineHeight;
}
} if (myEnd == false && Math.abs(this.x_now - this.cells[i].x_cell) <= this.LineHeight * Math.abs(this.flag_x) && Math.abs(this.y_now - this.cells[i].y_cell) <= this.LineHeight * Math.abs(this.flag_y)) {
canvas.moveTo(this.x_now, this.y_now);
canvas.lineTo(this.cells[i].x_cell, this.cells[i].y_cell); //this.endHeight = this.LineHeight - Math.abs(this.x_now - this.cells[i].x_cell)*flag.x_flag - Math.abs(this.y_now - this.cells[i].y_cell)*flag.y_flag;
if (this.flag_x == 0) { this.endHeight = this.LineHeight - Math.abs(this.y_now - this.cells[i].y_cell) / Math.abs(this.flag_y);
} else { this.endHeight = this.LineHeight - Math.abs(this.x_now - this.cells[i].x_cell) / Math.abs(this.flag_x);
} //this.endHeight = ( this.LineHeight * (Math.abs(this.flag_y) + Math.abs(this.flag_x)) - Math.abs(this.y_now - this.cells[i].y_cell) + Math.abs(this.x_now - this.cells[i].x_cell)) / 2;
}
} if (this.cellIndex < this.cells.length - 1) {
myEnd = false; this.deta_x = this.cells[this.cellIndex+1].x_cell-this.destination.x_d; this.deta_y = this.cells[this.cellIndex+1].y_cell-this.destination.y_d; this.deta = Math.sqrt(this.deta_x * this.deta_x + this.deta_y * this.deta_y); if (this.deta > 0) { this.flag_x = this.deta_x / this.deta; this.flag_y = this.deta_y / this.deta; if (this.endHeight > 0) {
canvas.moveTo(this.cells[this.cellIndex].x_cell, this.cells[this.cellIndex].y_cell);
canvas.lineTo(this.cells[this.cellIndex].x_cell + this.flag_x * (this.endHeight ), this.cells[this.cellIndex].y_cell + this.flag_y * this.endHeight); this.x_now = this.cells[this.cellIndex].x_cell + this.flag_x * ( this.endHeight); this.y_now = this.cells[this.cellIndex].y_cell + this.flag_y * ( this.endHeight); if(Math.abs(this.destination.x_d-this.x_now)>this.LineHeight*Math.abs(this.flag_x)||Math.abs(this.destination.y_d-this.y_now)>this.LineHeight*Math.abs(this.flag_y)){ this.x_now+=this.LineHeight*this.flag_x; this.y_now+=this.LineHeight*this.flag_y;
} else{ this.x_now=this.destination.x_d; this.y_now=this.destination.y_d;
} if (this.endHeight < 0) { this.endHeight = Math.abs(this.endHeight); this.x_now = this.cells[this.cellIndex].x_cell + this.flag_x * (this.endHeight); this.y_now = this.cells[this.cellIndex].y_cell + this.flag_y * (this.endHeight);
} if (this.endHeight == 0 && this.cellIndex > 0) { this.x_now = this.cells[this.cellIndex].x_cell; this.y_now = this.cells[this.cellIndex].y_cell;
} if (this.cellIndex == 0) { this.x_now = this.firstX; this.y_now = this.firstY; if (this.beginHeight > 0) {
canvas.moveTo(this.x_now, this.y_now);
canvas.lineTo(this.x_now + this.flag_x * this.beginHeight, this.y_now + this.flag_y * this.beginHeight);
} this.x_now += this.flag_x * (this.beginHeight + this.LineHeight); this.y_now += this.flag_y * (this.beginHeight + this.LineHeight);
} while ((Math.abs(this.x_now - this.destination.x_d) >= this.LineHeight * Math.abs(this.flag_x) && Math.abs(this.y_now - this.destination.y_d) >this.LineHeight * Math.abs(this.flag_y))||(Math.abs(this.x_now - this.destination.x_d) > this.LineHeight * Math.abs(this.flag_x) && Math.abs(this.y_now - this.destination.y_d) >=this.LineHeight * Math.abs(this.flag_y))) {
canvas.moveTo(this.x_now, this.y_now);
canvas.lineTo(this.x_now + this.flag_x * this.LineHeight, this.y_now + this.flag_y * this.LineHeight); this.x_now += this.flag_x * this.LineHeight; this.y_now += this.flag_y * this.LineHeight; if (Math.abs(this.x_now - this.destination.x_d)<= this.LineHeight * Math.abs(this.flag_x)&&Math.abs(this.y_now - this.destination.y_d) <= this.LineHeight * Math.abs(this.flag_y)) {
myEnd = true; break;
} else { this.x_now += this.flag_x * this.LineHeight; this.y_now += this.flag_y * this.LineHeight;
}
} if (myEnd == false && Math.abs(this.x_now - this.destination.x_d) < this.LineHeight * Math.abs(this.flag_x) || Math.abs(this.y_now - this.destination.y_d) < this.LineHeight * Math.abs(this.flag_y)) {
canvas.moveTo(this.x_now, this.y_now);
canvas.lineTo(this.destination.x_d, this.destination.y_d);
}
}
}
canvas.stroke();
canvas.closePath();
}取水泵房的實例
下面程式碼在定義了一個水池對象，並賦予了對應的屬性值，最後將定義的物件加入ｃａｎｖａｓ畫布中。
var SC01 = canvas.display.SC_show({ x: 326, y: 200,
Width: 181,
Height: 438,
height_now: 0,
trail_flag: 0,
t: 0,
fill: color_SC,
speed:speed_SC,
full:0,
start:0
});canvas.addChild(SC01);下面的程式碼定義了一個管道對象，並且給了管道對像一些初始值，最後添加到ｃａｎｖａｓ畫布中。
var GD01 = canvas.display.GD({ x: 0, y: 0,
destination: {
x_d: 0, y_d: 0
},
cells: [
{x_cell: 195, y_cell: 587},
{x_cell: 335, y_cell: 587}
],
deta: 1,
deta_x: 1,
deta_y: 0,
flag_x: 1,
flag_y: 0,
cellIndex: 0,
Speed: speed_all,
GDwidth: width_all,
LineHeight: 10,
x_now: 0,
y_now: 0,
firstX: 0,
firstY: 0,
beginHeight: 0,
endHeight: 0,
legacyHeight: 0,
paused: 1,
fill:color_GD,
full:0
});
canvas.addChild(GD01);具體動畫的流程控制如下：
canvas.setLoop(function () {
／／下面６个ａｄｖａｎｃｅ函数实现每一帧中的动画对象的更新操作
GD01.advance();
SC01.advance();
SC02.advance();
GD02.advance();
SC03.advance();
GD03.advance();
／／下面几个ｉｆ语句实现动画的流程控制
if(GD01.full==1){
SC01.start = 1;
SC02.start = 1;
}
if(SC02.full==1){
GD02.paused = 1;
}
if(GD02.full==1) {
SC03.start = 1;
arrow_1.start();
arrow_2.start();
}
if(SC03.full==1) {
GD03.paused = 1;
}
canvas.redraw(); ／／重绘画布
}).start(); ／／循环开始【相關推薦】
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