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HTML

              
                <canvas id="canvas" width="400" height="400">
              
            
!

CSS

              
                			body {
			  background: #0B0B0B;
			  font-family: 'PT Sans Narrow';
			}
			
			#canvas {
			  display: block;
			  width: 400px;
			  margin: 20px auto;
			}
              
            
!

JS

              
                		  	window.onload = function(){
				//canvas initialization
				var canvas = document.getElementById("canvas");
				var ctx = canvas.getContext("2d");
				//dimensions
				var W = canvas.width;
				var H = canvas.height;
				//Variables
				var TO_RADIANS = Math.PI / 180;
				var degrees = 0;
				var new_degrees = 0;
				var difference = 0;
				var color = "#fff";
				var bgcolor = "#2C393F";
				var readout;
				var readoutcolor = "#fff";
				var unit = "mph".split("").join(String.fromCharCode(8201)); 
				//unicode spacing used for letterspacing see http://www.fileformat.info/info/unicode/category/Zs/list.htm
				var unitcolor = "#7B9BA6";
				var gear;
				var animation_loop, redraw_loop;
				var linewidth = 2;
			
				function xyOnArc(cx,cy,radius,radianAngle){
				    var x=cx+radius*Math.cos(radianAngle);
				    var y=cy+radius*Math.sin(radianAngle);
				    return({x:x,y:y});
				}


				function init(){
					//Clear the canvas everytime a chart is drawn
					ctx.clearRect(0, 0, W, H);
					
					//line above MPH					
					ctx.beginPath();
					ctx.moveTo(130, H/3 - 5);
					ctx.strokeStyle  = bgcolor;
					ctx.lineWidth = 1;
					ctx.lineTo(270, H/3 - 5);					
					ctx.stroke();

					//line under MPH					
					ctx.beginPath();
					ctx.moveTo(140, H/2 + 5);
					ctx.lineTo(260, H/2 + 5);					
					ctx.stroke();

					//line under GEAR					
					ctx.beginPath();
					ctx.moveTo(130, H/3 * 2 + 5);
					ctx.lineTo(270, H/3 * 2 + 5);					
					ctx.stroke();

						//line dots
						ctx.beginPath();
						ctx.strokeStyle = "#fff";
						ctx.lineWidth = linewidth;
						ctx.arc(130, H/3 - 3, 1,  0, 360 * TO_RADIANS, false);
						ctx.stroke();
						//ctx.closePath();

						ctx.beginPath();
						ctx.arc(270, H/3 - 3, 1,  0, 360 * TO_RADIANS, false);
						ctx.stroke();
						//ctx.closePath();

						ctx.beginPath();
						ctx.arc(130, H/3 * 2 + 3, 1,  0, 360 * TO_RADIANS, false);
						ctx.stroke();
						//ctx.closePath();

						ctx.beginPath();
						ctx.arc(270, H/3 * 2 + 3, 1,  0, 360 * TO_RADIANS, false);
						ctx.stroke();
						//ctx.closePath();

						//decoration arcs
						//inner half
						ctx.beginPath();
						ctx.strokeStyle = bgcolor;
						ctx.lineWidth = linewidth - 1;
						ctx.arc(W/2, H/2, 100, 0-225 * TO_RADIANS, 0-135 * TO_RADIANS, false);
						ctx.stroke();

						//inner half
						ctx.beginPath();
						ctx.strokeStyle = bgcolor;
						ctx.lineWidth = linewidth - 1;
						ctx.arc(W/2, H/2, 100, 0-45 * TO_RADIANS, 45 * TO_RADIANS, false);
						ctx.stroke();

						//outer half
						ctx.beginPath();
						ctx.strokeStyle = bgcolor;
						ctx.lineWidth = linewidth - 1;
						ctx.arc(W/2, H/2, 130, -145 * TO_RADIANS, -35 * TO_RADIANS, false);
						ctx.stroke();

						//outer half
						ctx.beginPath();
						ctx.strokeStyle = bgcolor;
						ctx.lineWidth = linewidth - 1;
						ctx.arc(W/2, H/2, 130, 145 * TO_RADIANS, 35 * TO_RADIANS, true);
						ctx.stroke();


					//FUEL READOUT
						//fuel arc
						ctx.beginPath();
						ctx.strokeStyle = "#fff";
						ctx.lineWidth = linewidth - 1;
						ctx.arc(W/2, H/2, 115, -215 * TO_RADIANS, -145 * TO_RADIANS, false);
						ctx.stroke();
						//place F at top of arc
						var fuelArcF = xyOnArc(W/2,H/2,110, -145 * TO_RADIANS);
						ctx.font = "12px 'PT Sans Narrow'";
						ctx.fillStyle = "#fff";
						ctx.fillText("F", fuelArcF.x + 2, fuelArcF.y);
						//place E at top of arc
						var fuelArcE = xyOnArc(W/2,H/2,110, -215 * TO_RADIANS);
						ctx.font = "12px 'PT Sans Narrow'";
						ctx.fillStyle = "#F65E2C";
						ctx.fillText("E", fuelArcE.x + 2, fuelArcE.y + 4);

						for(fr = 0; fr < 16; fr ++){
							var fuelArcR = xyOnArc(W/2,H/2,110, ((60/16 * fr) - 207) * TO_RADIANS);
							ctx.beginPath();
							ctx.moveTo(fuelArcR.x -6, fuelArcR.y);
							ctx.lineWidth = 5;
							if(fr > 2){
								ctx.strokeStyle = "#293B49";
							} else {
								ctx.strokeStyle = "#F65E2C";
							}
							
							ctx.lineTo(fuelArcR.x + 10, fuelArcR.y);
							ctx.stroke();
						}
						//shading
						for(fr = 0; fr < 16; fr ++){
							var fuelArcR = xyOnArc(W/2,H/2,110, ((60/16 * fr) - 207) * TO_RADIANS);
							ctx.beginPath();
							ctx.moveTo(fuelArcR.x + 2, fuelArcR.y);
							ctx.lineWidth = 5;
							ctx.strokeStyle = "rgba(0,0,0,0.35)";
							ctx.lineTo(fuelArcR.x + 10, fuelArcR.y);
							ctx.stroke();
						}

						ctx.beginPath();
						ctx.strokeStyle = "#F65E2C";
						ctx.lineWidth = linewidth - 1;
						ctx.arc(W/2, H/2, 115, -208 * TO_RADIANS, -150 * TO_RADIANS, false);
						ctx.stroke();

					//TEMP READOUT
						
						
						//temp arc
						ctx.beginPath();
						ctx.strokeStyle = "#fff";
						ctx.lineWidth = linewidth - 1;
						ctx.arc(W/2, H/2, 115, -35 * TO_RADIANS, 35 * TO_RADIANS, false);
						ctx.stroke();
						//place H at top of arc
						var tempArcH = xyOnArc(W/2,H/2,110, -35 * TO_RADIANS);
						ctx.font = "12px 'PT Sans Narrow'";
						ctx.fillStyle = "#F65E2C";
						ctx.fillText("H", tempArcH.x - 8 , tempArcH.y - 4);
						//place C at bottom of arc
						var tempArcC = xyOnArc(W/2,H/2,110,  35 * TO_RADIANS);
						ctx.font = "12px 'PT Sans Narrow'";
						ctx.fillStyle = "#fff";
						ctx.fillText("C", tempArcC.x - 8 , tempArcC.y + 8);
					
						for(tr = 0; tr < 16; tr ++){
							var tempArcR = xyOnArc(W/2,H/2,110, -145 + (60/16 * tr) * TO_RADIANS);
							ctx.beginPath();
							ctx.moveTo(tempArcR.x + 6, tempArcR.y);
							ctx.lineWidth = 4;
							if(tr > 8){
								ctx.strokeStyle = "#fff";
							} else {
								ctx.strokeStyle = "#293B49";
							}
							ctx.lineTo(tempArcR.x - 10, tempArcR.y);
							ctx.stroke();
						}
						//shading
						for(tr = 0; tr < 16; tr ++){
							var tempArcR = xyOnArc(W/2,H/2,110, -145 + (60/16 * tr) * TO_RADIANS);
							ctx.beginPath();
							ctx.moveTo(tempArcR.x - 2, tempArcR.y);
							ctx.lineWidth = 4;
							ctx.strokeStyle = "rgba(0,0,0,0.35)";							
							ctx.lineTo(tempArcR.x - 10, tempArcR.y);
							ctx.stroke();
						}
					
					//outer speedo
					ctx.beginPath();
					ctx.strokeStyle = "#76A1A8";
					ctx.lineWidth = linewidth;
					ctx.arc(W/2, H/2, 170, - 270 * TO_RADIANS , 54 * TO_RADIANS, false);
					ctx.stroke();

						//red zone
						ctx.beginPath();
						ctx.strokeStyle = "#F65E2C";
						ctx.lineWidth = linewidth;
						ctx.arc(W/2, H/2, 170, 17 * TO_RADIANS, 54 * TO_RADIANS, false);
						ctx.stroke();

						
									

					//inner arc
					ctx.beginPath();
					ctx.strokeStyle = "#fff";
					ctx.lineWidth = linewidth;
					ctx.arc(W/2, H/2, 120,  0, 360 * TO_RADIANS, false);
					ctx.stroke();					
					
					//REV COUNTER
					var revPos = degrees * TO_RADIANS;
					ctx.beginPath();
					if(degrees > 288){
						ctx.strokeStyle = "rgba(246, 94, 44, 0.6)";
						readoutcolor = "#F65E2C";
					} else {
						ctx.strokeStyle = "rgba(255,255,255,0.1)";
						readoutcolor = "#fff";
					}
					ctx.lineWidth = 30;
					
					var revEnd = revPos + (90 * TO_RADIANS);										
					ctx.arc(W/2, H/2, 150, 90 * TO_RADIANS, revEnd, false); 
					ctx.stroke();	

					//REV COUNTER POINTER		
					ctx.save();
						ctx.beginPath();
						ctx.translate(W/2,H/2);
						ctx.rotate(revPos);
						ctx.moveTo(0, 120);
						ctx.lineWidth = 2;
						ctx.strokeStyle = "#F65E2C";
						ctx.lineTo(0, 160);
						ctx.stroke();
					ctx.restore();

					//REV COUNTER TICKS
					for(var n = 0; n <= 90; n++){ 
						ctx.save();
							ctx.beginPath();
							ctx.translate(W/2,H/2);
							ctx.rotate((360/100 * n)  * TO_RADIANS);
							//ctx.rotate(-4  * TO_RADIANS);

							ctx.moveTo(0, 165);
							ctx.lineWidth = 1;
							
							if(n > 80){
								ctx.strokeStyle = "#F65E2C";
							} else {
								ctx.strokeStyle = "#fff";
							}
							
							if(n % 10 == 0){								
								ctx.lineTo(0, 155);
							} else {				
								//minor
								ctx.lineTo(0, 162);								
							}
							
							ctx.stroke();
							
							
						ctx.restore();
					}

					//REV COUNTER NUMBERS
					for(var i = 9; i >= 0; i--){
						ctx.save();
						ctx.translate(W/2,H/2);
						ctx.rotate(180 * TO_RADIANS); //rotate 180 so we can place the text the right way up					
						ctx.rotate(((360/10) * i) * TO_RADIANS);											
						
						ctx.font = "12px 'PT Sans Narrow'";
						if( i > 7 ){
							ctx.fillStyle = "#F65E2C";
						}else{
							ctx.fillStyle = "#fff";
						}						
						ctx.fillText(i, -4, -140);
						ctx.restore();
					}					
					
					//SPEED
					ctx.fillStyle = readoutcolor;
					ctx.font = "50px 'PT Sans Narrow'";
					readoutNumeric = Math.floor((degrees/360*100) * 1.8);
					if(readoutNumeric < 0){
						readoutNumeric = 0;
					}											
					readout = readoutNumeric.toString().split("").join(String.fromCharCode(8201))
					readout_width = ctx.measureText(readout).width;
					//adding manual value to position y since the height of the text cannot be measured easily.
					ctx.fillText(readout, W/2 - readout_width/2, H/3 + 40);

					//MPH
					ctx.fillStyle = unitcolor;
					ctx.font = "14px 'PT Sans Narrow'";
					unit_width = ctx.measureText(unit).width;
					ctx.fillText(unit, W/2 - unit_width/2, H/3 + 60);


					//GEAR
					ctx.fillStyle = readoutcolor;
					ctx.font = "50px 'PT Sans Narrow'";
					if(readoutNumeric > 120) {
						gear = 6;
					}else if(readoutNumeric > 90){
						gear = 5;
					}else if(readoutNumeric > 70){
						gear = 4;
					}else if(readoutNumeric > 50){
						gear = 3;
					}else if(readoutNumeric > 30){
						gear = 2;
					}else if(readoutNumeric > 0){
						gear = 1;
					}else {
						gear = "N";
					}
					gear_width = ctx.measureText(gear).width;
					ctx.fillText(gear, W/2 - gear_width/2, H/3 + 120);

					
				}
				
				function draw(){
					//Cancel any movement animation if a new chart is requested
					if(typeof animation_loop != undefined) clearInterval(animation_loop);
					
					//random degree from 0 to 344
					new_degrees = Math.round(Math.random()*((360/10)*9));		
					difference = new_degrees - degrees;					
					
					//This will animate the gauge to new positions
					//The animation will take 1 second
					//time for each frame is based on difference, with a minimum time to ensure smooth movement
					//console.log(Math.max(0.2 * Math.abs(difference), 10));
					animation_loop = setInterval(animate_to, Math.max(0.1 * Math.abs(difference), 10));
				}
			
				//function to make the chart move to new degrees
				function animate_to(){
					//clear animation loop if degrees reaches to new_degrees
					if(degrees == new_degrees) 
						clearInterval(animation_loop);
					
					if(degrees < new_degrees)
						degrees++;
					else
						degrees--;
										
					init();
				}
								
				//initial set
				draw();

				//animation
				//redraw_loop = setInterval(draw,500);
			}
              
            
!
999px

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