canvas实现冠状病毒射击游戏

た入场券 2022-08-28 13:57 165阅读 0赞

# [在线演示][Link 1] #

![20210918181427738.gif][]

## 结构  ##

##  样式 ##

body {
    	background:#111;
    	margin:0;
    	padding:0
    }
    canvas {
    	background:#000;
    	display:block;
    	cursor:none
    }

## 方法  ##

"use strict"
    		var stage = {
    			w:1280,
    			h:720
    		}
    
    		var _pexcanvas = document.getElementById("canvas");
    		_pexcanvas.width = stage.w;
    		_pexcanvas.height = stage.h;
    		var ctx = _pexcanvas.getContext("2d");
    
    
    
    
    		var pointer = {
    			x:stage.w/2,
    			y:stage.h/4
    		}
    
    		var scale = 1;
    		var portrait = true;
    		var loffset = 0;
    		var toffset = 0;
    		var mxpos = 0;
    		var mypos = 0;
    
    
    // ------------------------------------------------------------------------------- Gamy
    
    var againprog = 0;
    
    var healthprog = 0;
    
    
    function newGame() {
    	score = 0;
    	health = 100;
    	enemies=[];
    	enemies.push(new Enemy());
    	enemies.push(new Enemy());
    	enemies.push(new Enemy());
    	againprog = 0;
    }
    
    
    
    function drawHeart(x,y,w) {
    	ctx.beginPath();
    	ctx.arc(x-w/4, y, w/4, 0.75*Math.PI,0);
    	ctx.arc(x+w/4, y, w/4, 1*Math.PI, 2.25*Math.PI);
    	ctx.lineTo(x,y+w/1.5);
    	ctx.closePath();
    	ctx.fill();
    }
    
    
    var Cannon = function(x,y,tx,ty) {
    	this.x = x;
    	this.y = y;
    	this.tx = tx;
    	this.ty = ty;
    	this.r = 10;
    }
    
    var cannons = [];
    
    var gameover = false;
    
    cannons.push(new Cannon(stage.w,stage.h,stage.w/2,stage.h/2));
    
    var firetm = 0;
    var fireact = true;
    
    var health = 100;
    var score = 0;
    
    
    var arm = {x:stage.w,y:stage.h};
    var arm2 = {x:0,y:stage.h};
    var danger = false;
    var dangera = 0;
    
    
    
    var Enemy = function() {
    	this.x = stage.w/2;
    	this.y = stage.h/2;
    	this.r = 10;
    	this.tx = Math.floor(Math.random()*stage.w);
    	this.ty = Math.floor(Math.random()*stage.h);
    	this.des = false;
    	this.eyeX = 0.4;
    	this.eyeY = 0.25;
    	this.eyeR = 0.25;
    	this.sp = 50;
    	this.spl = 1.4;
    	this.op=1;
    	this.danger = false;
    	this.nuked = false;
    }
    
    var enemies = [];
    // for (var i = 0; i < 10; i++) {
    // 	enemies[i] = new Enemy();
    // }
    		enemies.push(new Enemy());
    		enemies.push(new Enemy());
    		enemies.push(new Enemy());
    
    var entm = 0;
    var ga =0;
    
    var steptime = 0;
    
    
    var Star = function() {
    	this.a = Math.random()*Math.PI*2;
    	this.v = 3+Math.random()*5;
    	this.x = stage.w/2;
    	this.y = stage.h/2;
    	this.r = 0.2;
    }
    
    var Power = function() {
    	this.type = Math.floor(Math.random()*2)+1;
    	this.a = Math.random()*Math.PI*2;
    	this.v = 3+Math.random()*5;
    	this.x = stage.w/2;
    	this.y = stage.h/2;
    	this.r = 0.2;
    	this.dis = false;
    	this.op = 1;
    }
    
    
    var powers = [];
    var powertm = 0;
    var powermax = Math.random()*800+300;
    // powermax = 10;
    
    var stars = [];
    
    for (var i =0;i<200;i++) {
    	stars[i] = new Star();
    	var st = stars[i];
    	var move = Math.random()*400;
    
    	st.x += Math.sin(st.a)*move;
    	st.y += Math.cos(st.a)*move;
    
    
    }
    
    // powers.push(new Power());
    
    
    
    function enginestep() {
    	steptime = Date.now();
    	ctx.clearRect(0,0,stage.w,stage.h);
    	
    	ctx.fillStyle = "#ffffff";
    
    	
    	for (var i = 0; i < stars.length; i++) {
    		var st = stars[i];
    
    		st.x += Math.sin(st.a)*st.v;
    		st.y += Math.cos(st.a)*st.v;
    		st.r += st.v/200;
    
    		ctx.beginPath();
    		ctx.arc(st.x,st.y, st.r, 2*Math.PI, 0);
    		ctx.fill();
    
    		if (st.x>stage.w||st.x<0||st.y<0||st.y>stage.h) {
    			stars[i] = new Star();
    		}
    	}
    	if (!gameover) {
    		danger = false;
    
    
    		powertm++;
    		if (powertm>powermax) {
    			powers.push(new Power());
    			powertm = 0;
    			powermax = Math.random()*1200+600;
    			// powermax = 10;
    		}
    
    
    
    
    		for (var i = 0; i < powers.length; i++) {
    			var st = powers[i];
    
    			if (!st.des) {
    				st.x += Math.sin(st.a)*st.v/1.5;
    				st.y += Math.cos(st.a)*st.v/1.5;
    				st.r += st.v/15;
    			} else {
    				st.r *=1.1;
    				if (st.type==1) {
    				st.op += (0-st.op)/10;
    			} else {
    				st.op += (0-st.op)/20;
    
    			}
    				st.x += (stage.w/2-st.x)/10;
    				st.y += (stage.h/2-st.y)/10;
    
    			}
    
    			
    			if (st.type ==1) {
    				ctx.fillStyle = "rgba(255,0,0,"+st.op+")";
    
    				drawHeart(st.x,st.y-st.r/4, st.r*2);
    
    			} else {
    				ctx.fillStyle = "rgba(255,255,0,"+st.op+")";
    				ctx.strokeStyle = "rgba(255,255,0,"+st.op+")";
    				ctx.lineWidth = st.r/10;
    				ctx.beginPath();
    				ctx.arc(st.x,st.y, st.r, 2*Math.PI, 0);
    				ctx.stroke();
    
    				ctx.beginPath();
    				ctx.arc(st.x,st.y, st.r*0.15, 2*Math.PI, 0);
    				ctx.fill();
    
    
    				ctx.beginPath();
    				ctx.arc(st.x,st.y, st.r*0.85, 1.67*Math.PI, 2*Math.PI);
    				ctx.arc(st.x,st.y, st.r*0.25, 2*Math.PI, 1.67*Math.PI,true);
    
    				ctx.closePath();
    				ctx.fill();
    
    
    
    				ctx.beginPath();
    				ctx.arc(st.x,st.y, st.r*0.85, 3*Math.PI, 3.33*Math.PI);
    				ctx.arc(st.x,st.y, st.r*0.25, 3.33*Math.PI,3*Math.PI, true);
    				ctx.closePath();
    				ctx.fill();
    
    				ctx.beginPath();
    				ctx.arc(st.x,st.y, st.r*0.85, 2.33*Math.PI, 2.67*Math.PI);
    				ctx.arc(st.x,st.y, st.r*0.25, 2.67*Math.PI,2.33*Math.PI, true);
    				ctx.lineTo(st.x,st.y);
    				ctx.closePath();
    				ctx.fill();
    
    			}
    			if (st.x>stage.w||st.x<0||st.y<0||st.y>stage.h||st.r>stage.w/2) {
    				powers.splice(i,1);
    				if (st.type == 2&&st.r>stage.w/2) {
    					for (var e = 0; e < enemies.length; e++) {
    						enemies[e].des = true;
    						enemies[e].nuked = true;
    
    					}
    				}
    				i--;
    			}
    
    
    		}
    
    		entm++;
    		if (enemies.length<10&&entm>300) {
    			entm=0;
    			enemies.push(new Enemy());
    
    		}
    
    			ctx.lineWidth = 2;
    		for (var i = 0; i < enemies.length; i++) {
    			var en = enemies[i];
    			if (!en.danger) {
    				ctx.strokeStyle = "rgba(0,255,255,"+en.op*2+")";
    			} else {
    				health -= 0.01;
    				ctx.strokeStyle = "rgba(255,0,0,"+en.op*2+")";
    				danger = true;
    			}
    
    
    
    
    			if (!en.des) {
    
    				if (en.danger) {
    					var randx = Math.floor(Math.random()*4)-2;
    					var randy = Math.floor(Math.random()*4)-2;
    
    					en.x = en.tx+randx;
    					en.y = en.ty+randy;
    				} else {
    					en.x += (en.tx-en.x)/100;
    					en.y += (en.ty-en.y)/100;
    					var randx = 0;
    					var randy = 0;
    				}
    
    				en.r += (50-en.r)/100;
    				if (Math.abs(50-en.r)<2&&!en.danger) {
    					en.tx=en.x;
    					en.ty=en.y;
    					en.danger=true;
    				}
    				ctx.beginPath();
    				ctx.arc(en.x-en.r*en.eyeX,en.y-en.r*en.eyeY, en.r*en.eyeR, 0, 2*Math.PI);
    				ctx.stroke();
    				ctx.beginPath();
    				ctx.arc(en.x+en.r*en.eyeX,en.y-en.r*en.eyeY, en.r*en.eyeR, 0, 2*Math.PI);
    				ctx.stroke();
    
    				ctx.beginPath();
    				ctx.arc(en.x,en.y+en.r/4, en.r/3, 2*Math.PI, Math.PI);
    				ctx.stroke();
    
    				ctx.beginPath();
    				ctx.arc(en.x,en.y, en.r, 0, 2*Math.PI);
    				ctx.stroke();
    			} else {
    
    				en.eyeR += (0.5-en.eyeR)/5;
    				en.op += (0-en.op)/5;
    				// en.sp += (5-en.sp)/20;
    				en.r += (100-en.r)/20;
    				en.spl += (2.5-en.spl)/5;
    				ctx.beginPath();
    				ctx.arc(en.x-en.r*en.eyeX,en.y-en.r*en.eyeY, en.r*en.eyeR, 0, 2*Math.PI);
    				ctx.stroke();
    				ctx.beginPath();
    				ctx.arc(en.x+en.r*en.eyeX,en.y-en.r*en.eyeY, en.r*en.eyeR, 0, 2*Math.PI);
    				ctx.stroke();
    				ctx.beginPath();
    				ctx.arc(en.x,en.y+en.r/2, en.r*en.eyeR, Math.PI,2*Math.PI);
    				ctx.stroke();
    
    			ctx.beginPath();
    			ctx.arc(en.x,en.y, en.r, 0, 2*Math.PI);
    			ctx.stroke();
    			}
    
    			//spikes
    			for (var s = 0; s < 12; s++) {
    				var a = (Math.PI*2/12)*s+ga;
    				ctx.beginPath();
    				ctx.moveTo(en.x+Math.sin(a)*en.r,en.y+Math.cos(a)*en.r);
    				ctx.lineTo(en.x+Math.sin(a)*en.r*1.2,en.y+Math.cos(a)*en.r*1.2);
    				ctx.lineTo(en.x+Math.sin(a+Math.PI/en.sp)*en.r*en.spl,en.y+Math.cos(a+Math.PI/en.sp)*en.r*en.spl);
    				ctx.lineTo(en.x+Math.sin(a-Math.PI/en.sp)*en.r*en.spl,en.y+Math.cos(a-Math.PI/en.sp)*en.r*en.spl);
    				ctx.lineTo(en.x+Math.sin(a)*en.r*1.2,en.y+Math.cos(a)*en.r*1.2);
    				ctx.stroke();
    				// ctx.fill();
    			}
    
    			if (Math.abs(0.5-en.eyeR)<0.01) {
    				var rand = Math.floor(Math.random()*2);
    				if (enemies[i].nuked&&rand==1) {
    				enemies.splice(i,1);
    
    				} else {
    				enemies[i] = new Enemy();
    
    				}
    			}
    		}
    
    
    
    
    
    
    
    	    if (danger) {
    	    	dangera += 0.05+(100-health)/1000;
    	    	if (dangera>=Math.PI) {
    	    		dangera=0;
    	    	}
    	    	ctx.fillStyle='rgba(255,0,0,'+(1-Math.sin(dangera))/4+')';
    			ctx.fillRect(0,0,stage.w,stage.h);
    			if (health<10) {
    		    	ctx.fillStyle='rgba(255,255,0,'+(Math.sin(dangera))+')';
    		    	ctx.strokeStyle='rgba(255,255,0,'+(Math.sin(dangera))+')';
    
    			    ctx.lineWidth = 10;
    			    ctx.beginPath();
    			    ctx.lineJoin = 'round';
    			    ctx.moveTo(stage.w/2,stage.h/4);
    			    ctx.lineTo(stage.w/2+stage.h/7,stage.h/2);
    			    ctx.lineTo(stage.w/2-stage.h/7,stage.h/2);
    			    ctx.closePath();
    			    ctx.stroke();
    
    			    ctx.font = "bold 130px arial";
    			    ctx.textAlign = "center"; 
    			    ctx.textBaseline = "middle"; 
    			    ctx.fillText("!",stage.w/2,stage.h/2.5);
    
    			    ctx.font = "bold 50px arial";
    			    ctx.fillText("LOW HEALTH",stage.w/2,stage.h*0.6);
    			}
    	    } else {
    	    	dangera = 0;
    	    }
    
    	    healthprog += (health-healthprog)/5;
    	    ctx.fillStyle='#00ffff';
    	    ctx.font = "30px arial";
    	    ctx.textAlign = "left"; 
    	    ctx.textBaseline = "middle"; 
    	    ctx.fillText("Health: ",20,40);
    
    	    ctx.fillText("Score: "+score,stage.w-200,40);
    	    // ctx.fillText("Step:   "+(Date.now()-steptime),20,120);
    	    if (health>30) {
    	    	ctx.fillStyle='rgba(0,255,255,0.8)';
    		} else {
    	    	ctx.fillStyle='rgba(255,0,0,0.8)';
    		}
    		ctx.lineWidth = 2;
    	    ctx.fillRect(130,25,healthprog*3,30);
    	    ctx.strokeStyle = "#00ffff";
    	    ctx.strokeRect(130,25,300,30);
    	    
    	    if (health<0) {
    	    	gameover = true;
    	    }
    
    	} else {	
    
    
    	    ctx.fillStyle='rgba(0,255,255,0.3)';
    	    ctx.fillRect((stage.w-220)/2,stage.h*0.65-25,againprog,50);
    
        	ctx.fillStyle='#00ffff';
    	    ctx.font = "bold 130px arial";
    	    ctx.textAlign = "center"; 
    	    ctx.textBaseline = "middle"; 
    	    ctx.fillText("GAME OVER",stage.w/2,stage.h/3);
    	    ctx.font = "bold 50px arial";
    	    ctx.fillText("SCORE: "+score,stage.w/2,stage.h/2);
    
    	    ctx.font = "bold 30px arial";
    
    	    ctx.fillText("PLAY AGAIN",stage.w/2,stage.h*0.65);
    	    ctx.strokeRect((stage.w-220)/2,stage.h*0.65-25,220,50);
    
    	    againprog += (0-againprog)/50;
    
    	}
    
    		ctx.strokeStyle = "#00ffff";
    		ctx.fillStyle = "#00ffff";
    			ctx.lineWidth = 2;
    		if (fireact) {
    			firetm++;
    			if(firetm>5) {
    
    				cannons.push(new Cannon(pointer.x+(stage.w-pointer.x)/2.5,pointer.y+(stage.h-pointer.y)/2.5,pointer.x,pointer.y));
    				cannons.push(new Cannon(pointer.x-(pointer.x)/2.5,pointer.y+(stage.h-pointer.y)/2.5,pointer.x,pointer.y));
    
    
    				firetm=0;
    			}
    
    			arm.x=Math.floor(Math.random()*50)-25+stage.w;
    			arm.y=Math.floor(Math.random()*50)-25+stage.h;
    			arm2.x=Math.floor(Math.random()*30)-15;
    			arm2.y=Math.floor(Math.random()*30)-15+stage.h;
    		} else {
    			arm.x=stage.w;
    			arm.y=stage.h;
    			arm2.x=0;
    			arm2.y=stage.h;
    		}
    
    
    
    
    
    
    		for (var i = 0; i < cannons.length; i++) {
    			
    			var can = cannons[i];
    
    			can.x += (can.tx-can.x)/5;
    			can.y += (can.ty-can.y)/5;
    			can.r += (0-can.r)/5;
    
    			ctx.beginPath();
    			ctx.arc(can.x,can.y, can.r, 0, 2*Math.PI);
    			ctx.fill();
    
    
    			if (can.r<2&&!gameover) {
    				for (var a = 0; a < enemies.length; a++) {
    					var en = enemies[a];
    					var dx = can.x-en.x;
    					var dy = can.y-en.y;
    					var dis = dx*dx+dy*dy;
    					if (dis<en.r*en.r) {
    
    						// enemies.splice(a,1);
    						if (!enemies[a].des) {
    						enemies[a].des = true;
    
    						score+=10;
    
    						}
    					}
    
    				}
    				
    			}
    
    			if (can.r<1&&!gameover) {
    				for (var a = 0; a < powers.length; a++) {
    					var en = powers[a];
    					var dx = can.x-en.x;
    					var dy = can.y-en.y;
    					var dis = dx*dx+dy*dy;
    					if (dis<en.r*en.r) {
    
    						if (!en.des) {
    							powers[a].des = true;
    							if (en.type==1) {
    							health = 100;
    							}
    
    						}
    					}
    
    				}
    
    			}
    
    			if (can.r<1&&gameover) {
    
    				if (can.x>(stage.w-220)/2&&can.y>stage.h*0.65-25&&can.x<(stage.w-220)/2+220&&can.y<stage.h*0.65-25+50) {
    
    					againprog +=1;
    					if (againprog>220) {
    						newGame();
    						gameover = false;
    					}
    				}
    			}
    			if (Math.abs(can.tx-can.x)<1) {
    
    
    
    
    				cannons.splice(i,1);
    			}
    
    
    		
    		}
    		ctx.beginPath();
    		ctx.moveTo(pointer.x-20,pointer.y);
    		ctx.lineTo(pointer.x+20,pointer.y);
    		ctx.stroke();
    
    		ctx.beginPath();
    		ctx.moveTo(pointer.x,pointer.y-20);
    		ctx.lineTo(pointer.x,pointer.y+20);
    		ctx.stroke();
    
    			ctx.beginPath();
    			ctx.arc(pointer.x,pointer.y, 8, 0, 2*Math.PI);
    			ctx.stroke();
    
    		ctx.beginPath();
    		ctx.moveTo(pointer.x+(arm.x-pointer.x)/3,pointer.y+(arm.y-pointer.y)/3+10);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/2.5,pointer.y+(arm.y-pointer.y)/2.5+10);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/2,pointer.y+(arm.y-pointer.y)/2+10);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/1.5,pointer.y+(arm.y-pointer.y)/1.5+50);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/1.2,pointer.y+(arm.y-pointer.y)/1.2+80);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/1.1,pointer.y+(arm.y-pointer.y)/1.1+100);
    		ctx.stroke();
    		ctx.beginPath();
    		ctx.moveTo(pointer.x+(arm.x-pointer.x)/3-10,pointer.y+(arm.y-pointer.y)/3);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/2.5-10,pointer.y+(arm.y-pointer.y)/2.5);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/2-10,pointer.y+(arm.y-pointer.y)/2);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/1.5-50,pointer.y+(arm.y-pointer.y)/1.5);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/1.2-80,pointer.y+(arm.y-pointer.y)/1.2);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/1.1-100,pointer.y+(arm.y-pointer.y)/1.1);
    		ctx.stroke();
    
    		ctx.beginPath();
    		ctx.moveTo(pointer.x+(arm.x-pointer.x)/3,pointer.y+(arm.y-pointer.y)/3-10);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/2.5,pointer.y+(arm.y-pointer.y)/2.5-10);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/2,pointer.y+(arm.y-pointer.y)/2-10);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/1.5,pointer.y+(arm.y-pointer.y)/1.5-50);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/1.2,pointer.y+(arm.y-pointer.y)/1.2-80);
    		ctx.lineTo(pointer.x+(arm.x-pointer.x)/1.1,pointer.y+(arm.y-pointer.y)/1.1-100);
    		ctx.stroke();
    
    
    
    		ctx.beginPath();
    		ctx.moveTo(arm2.x+pointer.x-(pointer.x)/3,pointer.y+(arm2.y-pointer.y)/3+10);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/2.5,pointer.y+(arm2.y-pointer.y)/2.5+10);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/2,pointer.y+(arm2.y-pointer.y)/2+10);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/1.5,pointer.y+(arm2.y-pointer.y)/1.5+50);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/1.2,pointer.y+(arm2.y-pointer.y)/1.2+80);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/1.1,pointer.y+(arm2.y-pointer.y)/1.1+100);
    		ctx.stroke();
    
    		ctx.beginPath();
    		ctx.moveTo(arm2.x+pointer.x-(pointer.x)/3-10,pointer.y+(arm2.y-pointer.y)/3);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/2.5-10,pointer.y+(arm2.y-pointer.y)/2.5);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/2-10,pointer.y+(arm2.y-pointer.y)/2);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/1.5-50,pointer.y+(arm2.y-pointer.y)/1.5);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/1.2-80,pointer.y+(arm2.y-pointer.y)/1.2);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/1.1-100,pointer.y+(arm2.y-pointer.y)/1.1);
    		ctx.stroke();
    
    		ctx.beginPath();
    		ctx.moveTo(arm2.x+pointer.x-(pointer.x)/3,pointer.y+(arm2.y-pointer.y)/3-10);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/2.5,pointer.y+(arm2.y-pointer.y)/2.5-10);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/2,pointer.y+(arm2.y-pointer.y)/2-10);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/1.5,pointer.y+(arm2.y-pointer.y)/1.5-50);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/1.2,pointer.y+(arm2.y-pointer.y)/1.2-80);
    		ctx.lineTo(arm2.x+pointer.x-(pointer.x)/1.1,pointer.y+(arm2.y-pointer.y)/1.1-100);
    		ctx.stroke();
    
    
    
    
    		ctx.beginPath();
    		ctx.arc(pointer.x+(arm.x-pointer.x)/3,pointer.y+(arm.y-pointer.y)/3, 10, 0, 2*Math.PI);
    		ctx.arc(pointer.x+(arm.x-pointer.x)/2.5,pointer.y+(arm.y-pointer.y)/2.5, 10, 0, 2*Math.PI);
    		ctx.arc(pointer.x+(arm.x-pointer.x)/2,pointer.y+(arm.y-pointer.y)/2, 10, 0, 2*Math.PI);
    		ctx.arc(pointer.x+(arm.x-pointer.x)/1.5,pointer.y+(arm.y-pointer.y)/1.5, 50, 0, 2*Math.PI);
    		ctx.arc(pointer.x+(arm.x-pointer.x)/1.2,pointer.y+(arm.y-pointer.y)/1.2, 80, 0, 2*Math.PI);
    		ctx.arc(pointer.x+(arm.x-pointer.x)/1.1,pointer.y+(arm.y-pointer.y)/1.1, 100, 0, 2*Math.PI);
    		ctx.stroke();
    
    		
    		ctx.beginPath();
    		ctx.arc(arm2.x+pointer.x-(pointer.x/3),pointer.y+(arm2.y-pointer.y)/3, 10, 0, 2*Math.PI);
    		ctx.arc(arm2.x+pointer.x-(pointer.x/2.5),pointer.y+(arm2.y-pointer.y)/2.5, 10, 0, 2*Math.PI);
    		ctx.arc(arm2.x+pointer.x-(pointer.x)/2,pointer.y+(arm2.y-pointer.y)/2, 10, 0, 2*Math.PI);
    		ctx.arc(arm2.x+pointer.x-(pointer.x)/1.5,pointer.y+(arm2.y-pointer.y)/1.5, 50, 0, 2*Math.PI);
    		ctx.arc(arm2.x+pointer.x-(pointer.x)/1.2,pointer.y+(arm2.y-pointer.y)/1.2, 80, 0, 2*Math.PI);
    		ctx.arc(arm2.x+pointer.x-(pointer.x)/1.1,pointer.y+(arm2.y-pointer.y)/1.1, 100, 0, 2*Math.PI);
    		ctx.stroke();
    
    
        	ctx.fillStyle='#004444';
    	    ctx.font = "14px arial";
    	    ctx.textAlign = "center"; 
    	    ctx.textBaseline = "middle"; 
    	    ctx.fillText("Coronavirus Shooting Game, Designed & Developed by Faisal Jawed",stage.w/2,stage.h-20);
    }
    
    
    
    // ------------------------------------------------------------------------------- events
    // ------------------------------------------------------------------------------- events
    // ------------------------------------------------------------------------------- events
    // ------------------------------------------------------------------------------- events
    
    function toggleFullScreen() {
    	var doc = window.document;
    	var docEl = doc.documentElement;
    
    	var requestFullScreen = docEl.requestFullscreen || docEl.mozRequestFullScreen || docEl.webkitRequestFullScreen || docEl.msRequestFullscreen;
    	var cancelFullScreen = doc.exitFullscreen || doc.mozCancelFullScreen || doc.webkitExitFullscreen || doc.msExitFullscreen;
    
    	if(!doc.fullscreenElement && !doc.mozFullScreenElement && !doc.webkitFullscreenElement && !doc.msFullscreenElement) {
    		requestFullScreen.call(docEl);
    
    	}
    	else {
    		cancelFullScreen.call(doc);
    
    	}
    }
    
    
    var ox = 0;
    var oy = 0;
    function mousestart(e) {
    	mxpos = (e.pageX-loffset)*scale;
    	mypos = (e.pageY-toffset)*scale;
    	pointer.x = mxpos;
    	pointer.y = mypos;
    
    // fireact = true;
    
    
    
    }
    function mousemove(e) {
    	mxpos = (e.pageX-loffset)*scale;
    	mypos = (e.pageY-toffset)*scale;
    	pointer.x = mxpos;
    	pointer.y = mypos;
    
    	// ball.vY += (mxpos-ox)/15*line.d;
    
    	ox = mxpos;
    }
    
    function mouseend(e) {
    // fireact = false;
    
    }
    
    var moveX = 0;
    var moveY = 0;
    var moveZ = 0;
    
    
    function keydowned(e) {
    	// if (e.keyCode==65) {
    	// 	moveX = 10;
    	// } else if (e.keyCode==68) {
    	// 	moveX = -10;
    	// }
    	// if (e.keyCode==83) {
    	// 	moveY = -10;
    	// } else if (e.keyCode==87) {
    	// 	moveY = 10;
    	// }
    
    	// if (e.keyCode==69) {
    	// 	moveZ = 10;
    	// } else if (e.keyCode==81) {
    	// 	moveZ = -10;
    	// }
    	// console.log(e.keyCode);
    }
    
    
    
    function keyuped(e) {
    	// if (e.keyCode==65) {
    	// 	moveX = 0;
    	// } else if (e.keyCode==68) {
    	// 	moveX = 0;
    	// }
    	// if (e.keyCode==87) {
    	// 	moveY = 0;
    	// } else if (e.keyCode==83) {
    	// 	moveY = 0;
    	// }
    	// if (e.keyCode==81) {
    	// 	moveZ = 0;
    	// } else if (e.keyCode==69) {
    	// 	moveZ = 0;
    	// }
    	// console.log("u"+e.keyCode);
    }
    
    
    
    window.addEventListener('mousedown', function(e) {
    	mousestart(e);
    }, false);
    window.addEventListener('mousemove', function(e) {
    	mousemove(e);
    }, false);
    window.addEventListener('mouseup', function(e) {
    	mouseend(e);
    }, false);
    window.addEventListener('touchstart', function(e) {
    	e.preventDefault();
    	mousestart(e.touches[0]);
    }, false);
    window.addEventListener('touchmove', function(e) {
    	e.preventDefault();
    	mousemove(e.touches[0]);
    }, false);
    window.addEventListener('touchend', function(e) {
    	e.preventDefault();
    	mouseend(e.touches[0]);
    }, false);
    
    
    window.addEventListener('keydown', function(e) {
    	keydowned(e);
    }, false);
    window.addEventListener('keyup', function(e) {
    	keyuped(e);
    }, false);
    
    // ------------------------------------------------------------------------ stager
    // ------------------------------------------------------------------------ stager
    // ------------------------------------------------------------------------ stager
    // ------------------------------------------------------------------------ stager
    function _pexresize() {
    	var cw = window.innerWidth;
    	var ch = window.innerHeight;
    	if (cw<=ch*stage.w/stage.h) {
    		portrait = true;
    		scale = stage.w/cw;
    		loffset = 0;
    		toffset = Math.floor(ch-(cw*stage.h/stage.w))/2;
    		_pexcanvas.style.width = cw + "px";
    		_pexcanvas.style.height = Math.floor(cw*stage.h/stage.w) + "px";
    	} else {
    		scale = stage.h/ch;
    		portrait = false;
    		loffset = Math.floor(cw-(ch*stage.w/stage.h))/2;
    		toffset = 0;
    		_pexcanvas.style.height = ch + "px";
    		_pexcanvas.style.width = Math.floor(ch*stage.w/stage.h) + "px";
    	}
    	_pexcanvas.style.marginLeft = loffset +"px";
    	_pexcanvas.style.marginTop = toffset +"px";
    }
    
    
    window.requestAnimFrame = (function(){
    	return  window.requestAnimationFrame       ||
    	window.webkitRequestAnimationFrame ||
    	window.mozRequestAnimationFrame    ||
    	window.oRequestAnimationFrame      ||
    	window.msRequestAnimationFrame     ||
    	function( callback ){
    		window.setTimeout(callback, 1000 / 60);
    	};})();
    
    
    
    	var fps = 60;
    
    
    	var nfcount = 0;
    
    function animated() {
    	requestAnimFrame(animated);
    	enginestep();
    
       	nfcount++;
        ctx.fillStyle='#00ffff';
        ctx.font = "12px arial";
        ctx.textAlign = "left"; 
        ctx.fillText("FPS: "+Math.floor(fps),10,stage.h-20);
    }
    
    _pexresize();
    animated();
    
    
    function countfps() {
    	fps = nfcount;
    	nfcount = 0;
    }
    setInterval(countfps,1000);

[Link 1]: https://codepen.io/jackiedyh/pen/WNOMBZB
[20210918181427738.gif]: /images/20220828/60ea9a0434bb409cba951f2890742ede.png