老式赛车游戏

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JavaScript

drawBg();
draw();

function drawHUD(ctx, centerX, centerY, color) {
  var radius = 50, tigs = [0, 90, 135, 180, 225, 270, 315],
      angle = 90;

ctx.beginPath();
  ctx.arc(centerX, centerY, radius, 0, 2 * Math.PI, false);
  ctx.lineWidth = 7;
  ctx.fillStyle = 'rgba(0, 0, 0, 0.4)';
  ctx.fill();
  ctx.strokeStyle = color;
  ctx.stroke();
  
  for (var i = 0; i < tigs.length; i++) {
    drawTig(ctx, centerX, centerY, radius, tigs[i], 7);
  }
  
  // draw pointer
  angle = map($.state.speed, 0, $.state.car.maxSpeed, 90, 360);
  drawPointer(ctx, color, 50, centerX, centerY, angle);
}

function drawPointer(ctx, color, radius, centerX, centerY, angle) {
  var point = getCirclePoint(centerX, centerY, radius - 20, angle),
      point2 = getCirclePoint(centerX, centerY, 2, angle + 90),
      point3 = getCirclePoint(centerX, centerY, 2, angle - 90);
  
  ctx.beginPath();
  ctx.strokeStyle = "#FF9166";
  ctx.lineCap = 'round';
  ctx.lineWidth = 4;
  ctx.moveTo(point2.x, point2.y);
  ctx.lineTo(point.x, point.y);
  ctx.lineTo(point3.x, point3.y);
  ctx.stroke();
  
  ctx.beginPath();
  ctx.arc(centerX, centerY, 9, 0, 2 * Math.PI, false);
  ctx.fillStyle = color;
  ctx.fill();
}

function drawTig(ctx, x, y, radius, angle, size) {
  var startPoint = getCirclePoint(x, y, radius - 4, angle),
      endPoint = getCirclePoint(x, y, radius - size, angle)
  
  ctx.beginPath();
  ctx.lineCap = 'round';
  ctx.moveTo(startPoint.x, startPoint.y);
  ctx.lineTo(endPoint.x, endPoint.y);
  ctx.stroke();
}

function getCirclePoint(x, y, radius, angle) {
    var radian = (angle / 180) * Math.PI;
  
    return {
      x: x + radius * Math.cos(radian),
      y: y + radius * Math.sin(radian)
    }
}

function keyUp(e) {
    move(e, false);
}

function keyDown(e) {
    move(e, true);
}

function move(e, isKeyDown) {
  if(e.keyCode >= 37 && e.keyCode <= 40) {
    e.preventDefault();
  }

if(e.keyCode === 37) {
    $.state.keypress.left = isKeyDown;
  }

if(e.keyCode === 38) {
    $.state.keypress.up = isKeyDown;
  }

if(e.keyCode === 39) {
    $.state.keypress.right = isKeyDown;
  }

if(e.keyCode === 40) {
    $.state.keypress.down = isKeyDown;
  }
}

function randomRange(min, max) {
  return min + Math.random() * (max - min);
}

function norm(value, min, max) {
  return (value - min) / (max - min);
}

function lerp(norm, min, max) {
  return (max - min) * norm + min;
}

function map(value, sourceMin, sourceMax, destMin, destMax) {
  return lerp(norm(value, sourceMin, sourceMax), destMin, destMax);
}

function clamp(value, min, max) {
  return Math.min(Math.max(value, min), max);
}

function drawBg() {
  $.ctx.fillStyle = $.colors.sky;
  $.ctx.fillRect(0, 0, $.canvas.width, $.settings.skySize);
  drawMountain(0, 60, 200);
  drawMountain(280, 40, 200);
  drawMountain(400, 80, 200);
  drawMountain(550, 60, 200);
  
  $.storage.bg = $.ctx.getImageData(0, 0, $.canvas.width, $.canvas.height);
}

function drawMountain(pos, height, width) {
  $.ctx.fillStyle = $.colors.mountains;
  $.ctx.strokeStyle = $.colors.mountains;
  $.ctx.lineJoin = "round";
  $.ctx.lineWidth = 20;
  $.ctx.beginPath();
  $.ctx.moveTo(pos, $.settings.skySize);
  $.ctx.lineTo(pos + (width / 2), $.settings.skySize - height);
  $.ctx.lineTo(pos + width, $.settings.skySize);
  $.ctx.closePath();
  $.ctx.stroke();
  $.ctx.fill();
}

function drawSky() {
  $.ctx.fillStyle = $.colors.sky;
  $.ctx.fillRect(0, 0, $.canvas.width, $.settings.skySize);
}

function drawRoad(min, max, squishFactor, color) {
  var basePos = $.canvas.width + $.state.xpos;
  
  $.ctx.fillStyle = color;
  $.ctx.beginPath();
  $.ctx.moveTo(((basePos + min) / 2) - ($.state.currentCurve * 3), $.settings.skySize);
  $.ctx.quadraticCurveTo((((basePos / 2) + min)) + ($.state.currentCurve / 3) + squishFactor, $.settings.skySize + 52, (basePos + max) / 2, $.canvas.height);
  $.ctx.lineTo((basePos - max) / 2, $.canvas.height);
  $.ctx.quadraticCurveTo((((basePos / 2) - min)) + ($.state.currentCurve / 3) - squishFactor, $.settings.skySize + 52, ((basePos - min) / 2) - ($.state.currentCurve * 3), $.settings.skySize);
  $.ctx.closePath();
  $.ctx.fill();
}

function drawCar() {
  var carWidth = 160,
      carHeight = 50,
      carX = ($.canvas.width / 2) - (carWidth / 2),
      carY = 320;
  
  // shadow
  roundedRect($.ctx, "rgba(0, 0, 0, 0.35)", carX - 1 + $.state.turn, carY + (carHeight - 35), carWidth + 10, carHeight, 9);
  
  // tires
  roundedRect($.ctx, "#111", carX, carY + (carHeight - 30), 30, 40, 6);
  roundedRect($.ctx, "#111", (carX - 22) + carWidth, carY + (carHeight - 30), 30, 40, 6);
  
  drawCarBody($.ctx);
}

function drawCarBody(ctx) {
  var startX = 299, startY = 311,
      lights = [10, 26, 134, 152],
      lightsY = 0;
  
  /* Front */
  roundedRect($.ctx, "#C2C2C2", startX + 6 + ($.state.turn * 1.1), startY - 18, 146, 40, 18);
  
  ctx.beginPath(); 
  ctx.lineWidth="12";
  ctx.fillStyle="#FFFFFF";
  ctx.strokeStyle="#FFFFFF";
  ctx.moveTo(startX + 30, startY);
  ctx.lineTo(startX + 46 + $.state.turn, startY - 25);
  ctx.lineTo(startX + 114 + $.state.turn, startY - 25);
  ctx.lineTo(startX + 130, startY);
  ctx.fill();
  ctx.stroke();
  /* END: Front */
  
  ctx.lineWidth="12";
  ctx.lineCap = 'round';
  ctx.beginPath(); 
  ctx.fillStyle="#DEE0E2";
  ctx.strokeStyle="#DEE0E2";
  ctx.moveTo(startX + 2, startY + 12 + ($.state.turn * 0.2));
  ctx.lineTo(startX + 159, startY + 12 + ($.state.turn * 0.2));
  ctx.quadraticCurveTo(startX + 166, startY + 35, startX + 159, startY + 55 + ($.state.turn * 0.2));
  ctx.lineTo(startX + 2, startY + 55 - ($.state.turn * 0.2));
  ctx.quadraticCurveTo(startX - 5, startY + 32, startX + 2, startY + 12 - ($.state.turn * 0.2));
  ctx.fill();
  ctx.stroke();

ctx.beginPath(); 
  ctx.lineWidth="12";
  ctx.fillStyle="#DEE0E2";
  ctx.strokeStyle="#DEE0E2";
  ctx.moveTo(startX + 30, startY);
  ctx.lineTo(startX + 40 + ($.state.turn * 0.7), startY - 15);
  ctx.lineTo(startX + 120 + ($.state.turn * 0.7), startY - 15);
  ctx.lineTo(startX + 130, startY);
  ctx.fill();
  ctx.stroke();
  
  roundedRect(ctx, "#474747", startX - 4, startY, 169, 10, 3, true, 0.2);
  roundedRect(ctx, "#474747", startX + 40, startY + 5, 80, 10, 5, true, 0.1);
  
  ctx.fillStyle = "#FF9166";
  
  lights.forEach(function(xPos) {
    ctx.beginPath();
    ctx.arc(startX + xPos, startY + 20 + lightsY, 6, 0, Math.PI*2, true); 
    ctx.closePath();
    ctx.fill();
    lightsY += $.state.turn * 0.05;
  });
  
  ctx.lineWidth="9";
  ctx.fillStyle="#222222";
  ctx.strokeStyle="#444";
  
  roundedRect($.ctx, "#FFF", startX + 60, startY + 25, 40, 18, 3, true, 0.05);
}

function roundedRect(ctx, color, x, y, width, height, radius, turn, turneffect) {
  var skew = turn === true ? $.state.turn * turneffect : 0;
  
  ctx.fillStyle = color;
  ctx.beginPath();
  ctx.moveTo(x + radius, y - skew);
  
  // top right
  ctx.lineTo(x + width - radius, y + skew);
  ctx.arcTo(x + width, y + skew, x + width, y + radius + skew, radius);
  ctx.lineTo(x + width, y + radius + skew);
  
  // down right
  ctx.lineTo(x + width, (y + height + skew) - radius);
  ctx.arcTo(x + width, y + height + skew, (x + width) - radius, y + height + skew, radius);
  ctx.lineTo((x + width) - radius, y + height + skew);
  
  // down left
  ctx.lineTo(x + radius, y + height - skew);
  ctx.arcTo(x, y + height - skew, x, (y + height - skew) - radius, radius);
  ctx.lineTo(x, (y + height - skew) - radius);
  
  // top left
  ctx.lineTo(x, y + radius - skew);
  ctx.arcTo(x, y - skew, x + radius, y - skew, radius);
  ctx.lineTo(x + radius, y - skew);
  ctx.fill();
}

function drawGround(ctx, offset, lightColor, darkColor, width) {
  var pos = ($.settings.skySize - $.settings.ground.min) + offset, stepSize = 1, drawDark = $.state.startDark, firstRow = true;
  ctx.fillStyle = lightColor;
  ctx.fillRect(0, $.settings.skySize, width, $.settings.ground.size);

ctx.fillStyle =  darkColor;
  while(pos <= $.canvas.height) {
    stepSize = norm(pos, $.settings.skySize, $.canvas.height) * $.settings.ground.max;
    if(stepSize < $.settings.ground.min) {
      stepSize = $.settings.ground.min;
    }
  
    if(drawDark) {
      if(firstRow) {
        ctx.fillRect(0, $.settings.skySize, width, stepSize - (offset > $.settings.ground.min ? $.settings.ground.min : $.settings.ground.min - offset));
      } else {
        ctx.fillRect(0, pos < $.settings.skySize ? $.settings.skySize : pos, width, stepSize);
      }
    }
    
    firstRow = false;
    pos += stepSize;
    drawDark = !drawDark;
  }
}

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