Javascript 如何在轮盘赌中插入图像而不是文本数据
我用它来创建我自己的轮盘赌,但它的价值不是100美元。。在“选项”中,我需要使用图像(徽标)。 我该怎么做?使用Javascript 如何在轮盘赌中插入图像而不是文本数据,javascript,html,canvas,roulette-wheel-selection,Javascript,Html,Canvas,Roulette Wheel Selection,我用它来创建我自己的轮盘赌,但它的价值不是100美元。。在“选项”中,我需要使用图像(徽标)。 我该怎么做?使用 <input type="button" value="spin" style="float:left;" id='spin' /> <canvas id="canvas" width="500" height="500"></canvas> var options = ["$100", "$10", "$25", "$250", "$30",
<input type="button" value="spin" style="float:left;" id='spin' />
<canvas id="canvas" width="500" height="500"></canvas>
var options = ["$100", "$10", "$25", "$250", "$30", "$1000"];
var pattern1, pattern2;
var startAngle = 0;
var arc = Math.PI / (options.length / 2);
var spinTimeout = null;
var spinArcStart = 10;
var spinTime = 0;
var spinTimeTotal = 0;
var canvas = document.getElementById("canvas");
var ctx;
document.getElementById("spin").addEventListener("click", spin);
var img1=new Image();
img1.onload=start;
img1.src="http://oi63.tinypic.com/2n1eyxk.jpg";
var img2=new Image();
img2.onload=start;
img2.src="http://oi63.tinypic.com/2n1eyxk.jpg";
var imgCount=2;
function start(){
if(--imgCount>0){return;}
pattern1=ctx.createPattern(img1,'repeat');
pattern2=ctx.createPattern(img2,'repeat');
draw();
}
function byte2Hex(n) {
var nybHexString = "0123456789ABCDEF";
return String(nybHexString.substr((n >> 4) & 0x0F,1)) + nybHexString.substr(n & 0x0F,1);
}
function RGB2Color(r,g,b) {
return '#' + byte2Hex(r) + byte2Hex(g) + byte2Hex(b);
}
function getColor(item, maxitem) {
var phase = 0;
var center = 128;
var width = 127;
var frequency = Math.PI*2/maxitem;
red = Math.sin(frequency*item+2+phase) * width + center;
green = Math.sin(frequency*item+0+phase) * width + center;
blue = Math.sin(frequency*item+4+phase) * width + center;
return RGB2Color(red,green,blue);
}
function drawRouletteWheel() {
var canvas = document.getElementById("canvas");
if (canvas.getContext) {
var outsideRadius = 200;
var textRadius = 160;
var insideRadius = 125;
ctx = canvas.getContext("2d");
ctx.clearRect(0,0,500,500);
ctx.strokeStyle = "black";
ctx.lineWidth = 2;
ctx.font = 'bold 12px Helvetica, Arial';
for(var i = 0; i < options.length; i++) {
var angle = startAngle + i * arc;
//ctx.fillStyle = colors[i];
ctx.fillStyle = getColor(i, options.length);
ctx.beginPath();
ctx.arc(250, 250, outsideRadius, angle, angle + arc, false);
ctx.arc(250, 250, insideRadius, angle + arc, angle, true);
ctx.stroke();
ctx.fill();
ctx.save();
ctx.shadowOffsetX = -1;
ctx.shadowOffsetY = -1;
ctx.shadowBlur = 0;
ctx.shadowColor = "rgb(220,220,220)";
ctx.fillStyle = "black";
ctx.translate(250 + Math.cos(angle + arc / 2) * textRadius,
250 + Math.sin(angle + arc / 2) * textRadius);
ctx.rotate(angle + arc / 2 + Math.PI / 2);
var text = options[i];
ctx.fillText(text, -ctx.measureText(text).width / 2, 0);
ctx.restore();
}
//Arrow
ctx.fillStyle = "black";
ctx.beginPath();
ctx.moveTo(250 - 4, 250 - (outsideRadius + 5));
ctx.lineTo(250 + 4, 250 - (outsideRadius + 5));
ctx.lineTo(250 + 4, 250 - (outsideRadius - 5));
ctx.lineTo(250 + 9, 250 - (outsideRadius - 5));
ctx.lineTo(250 + 0, 250 - (outsideRadius - 13));
ctx.lineTo(250 - 9, 250 - (outsideRadius - 5));
ctx.lineTo(250 - 4, 250 - (outsideRadius - 5));
ctx.lineTo(250 - 4, 250 - (outsideRadius + 5));
ctx.fill();
}
}
function spin() {
spinAngleStart = Math.random() * 10 + 10;
spinTime = 0;
spinTimeTotal = Math.random() * 3 + 4 * 1000;
rotateWheel();
}
function rotateWheel() {
spinTime += 30;
if(spinTime >= spinTimeTotal) {
stopRotateWheel();
return;
}
var spinAngle = spinAngleStart - easeOut(spinTime, 0, spinAngleStart, spinTimeTotal);
startAngle += (spinAngle * Math.PI / 180);
drawRouletteWheel();
spinTimeout = setTimeout('rotateWheel()', 30);
}
function stopRotateWheel() {
clearTimeout(spinTimeout);
var degrees = startAngle * 180 / Math.PI + 90;
var arcd = arc * 180 / Math.PI;
var index = Math.floor((360 - degrees % 360) / arcd);
ctx.save();
ctx.font = 'bold 30px Helvetica, Arial';
var text = options[index]
ctx.fillText(text, 250 - ctx.measureText(text).width / 2, 250 + 10);
ctx.restore();
}
function easeOut(t, b, c, d) {
var ts = (t/=d)*t;
var tc = ts*t;
return b+c*(tc + -3*ts + 3*t);
}
drawRouletteWheel();
var期权=[“$100”、“$10”、“$25”、“$250”、“$30”、“$1000”];
变量模式1,模式2;
var-startAngle=0;
var arc=Math.PI/(options.length/2);
var spinTimeout=null;
var spinArcStart=10;
var spinTime=0;
var spinTimeTotal=0;
var canvas=document.getElementById(“canvas”);
var-ctx;
document.getElementById(“spin”).addEventListener(“单击”,spin);
var img1=新图像();
img1.onload=启动;
img1.src=”http://oi63.tinypic.com/2n1eyxk.jpg";
var img2=新图像();
img2.onload=启动;
img2.src=”http://oi63.tinypic.com/2n1eyxk.jpg";
var imgCount=2;
函数start(){
如果(--imgCount>0){return;}
pattern1=ctx.createPattern(img1,'repeat');
pattern2=ctx.createPattern(img2,'repeat');
draw();
}
函数字节2hex(n){
var nybHexString=“0123456789ABCDEF”;
返回字符串(nybHexString.substr((n>>4)和0x0F,1))+nybHexString.substr(n和0x0F,1);
}
功能RGB2Color(r、g、b){
返回'#'+byte2Hex(r)+byte2Hex(g)+byte2Hex(b);
}
函数getColor(item,maxitem){
var相位=0;
var中心=128;
var宽度=127;
变量频率=数学PI*2/maxitem;
红色=数学正弦(频率*项目+2+相位)*宽度+中心;
绿色=数学正弦(频率*项目+0+相位)*宽度+中心;
蓝色=数学正弦(频率*项目+4+相位)*宽度+中心;
返回RGB2Color(红色、绿色、蓝色);
}
函数DrawRouletWheel(){
var canvas=document.getElementById(“canvas”);
if(canvas.getContext){
var=200;
var textRadius=160;
var insideRadius=125;
ctx=canvas.getContext(“2d”);
ctx.clearRect(0,0500);
ctx.strokeStyle=“黑色”;
ctx.lineWidth=2;
ctx.font='bold 12px Helvetica,Arial';
对于(变量i=0;i=自旋时间总计){
停止旋转车轮();
返回;
}
var spinAngle=spinAngleStart-easeOut(自旋时间,0,spinAngleStart,SpinangleTotal);
startAngle+=(spinAngle*Math.PI/180);
drawRouletteWheel();
spinTimeout=setTimeout('rotateWheel()',30);
}
功能停止旋转轮(){
clearTimeout(spinTimeout);
变量度=startAngle*180/Math.PI+90;
var arcd=arc*180/Math.PI;
var指数=数学地板((360度/360度)/arcd);
ctx.save();
ctx.font='bold 30px Helvetica,Arial';
var text=选项[索引]
ctx.fillText(文本,250-ctx.measureText(文本).width/2250+10);
ctx.restore();
}
功能输出(t、b、c、d){
变量ts=(t/=d)*t;
var tc=ts*t;
返回b+c*(tc+-3*ts+3*t);
}
drawRouletteWheel();
在示例中使用“context.pattern”不允许执行代码和轮盘赌。我使用图像url数组,并使用
map
将其转换为图像对象数组,因此我可以在画布上绘制,在呈现文本ws的地方,使用drawImage
var选项=[
"http://icons.iconarchive.com/icons/froyoshark/enkel/128/Telegram-icon.png", "http://icons.iconarchive.com/icons/froyoshark/enkel/128/Telegram-icon.png", "http://icons.iconarchive.com/icons/froyoshark/enkel/128/Telegram-icon.png", "http://icons.iconarchive.com/icons/froyoshark/enkel/128/Telegram-icon.png", "http://icons.iconarchive.com/icons/froyoshark/enkel/128/Telegram-icon.png", "http://icons.iconarchive.com/icons/froyoshark/enkel/128/Telegram-icon.png"];
变量模式1,模式2;
var-startAngle=0;
var arc=Math.PI/(options.length/2);
var spinTimeout=null;
var spinArcStart=10;
var spinTime=0;
var spinTimeTotal=0;
var canvas=document.getElementById(“canvas”);
var-ctx;
options=options.map(x=>{
var img=新图像();
img.src=x;
返回img;
});
document.getElementById(“spin”).addEventListener(“单击”,spin);
函数字节2hex(n){
var nybHexString=“0123456789ABCDEF”;
返回字符串(nybHexString.substr((n>>4)和0x0F,1))+nybHexString.substr(n和0x0F,1);
}
功能RGB2Color(r、g、b){
返回'#'+byte2Hex(r)+byte2Hex(g)+byte2Hex(b);
}
函数getColor(item,maxitem){
var相位=0;
var中心=128;
var宽度=127;
变量频率=数学PI*2/maxitem;
红色=数学正弦(频率*项目+2+相位)*宽度+中心;
绿色=数学正弦(频率*项目+0+相位)*宽度+中心;
蓝色=数学正弦(频率*项目+4+相位)*宽度+中心;
返回RGB2