canvas实现鼠标控制方向2公里比赛游戏
代码语言：html
所属分类：游戏
代码描述：canvas实现鼠标控制方向2公里比赛游戏，纯js实现canvas游戏，无需第三方库
下面为部分代码预览，完整代码请点击下载或在bfwstudio webide中打开
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
</head>
<body style='margin:0;overflow:hidden'>
<canvas id="c"></canvas>
<script>
// HUE JUMPER - By Frank Force
// A 3D racing game in 2 Kilobytes!
//
// Click = Start
// Mouse = Turn
// Double Click = Jump
//
// The road ends at 1000...
// draw settings
const context = c.getContext`2d`; // canvas context
const drawDistance = 800; // how far ahead to draw
const cameraDepth = 1; // FOV of camera
const segmentLength = 100; // length of each road segment
const roadWidth = 500; // how wide is road
const curbWidth = 150; // with of warning track
const dashLineWidth = 9; // width of the dashed line
const maxPlayerX = 2e3; // limit player offset
const mountainCount = 30; // how many mountains are there
const timeDelta = 1/60; // inverse frame rate
const PI = Math.PI; // shorthand for Math.PI
// player settings
const height = 150; // high of player above ground
const maxSpeed = 300; // limit max player speed
const playerAccel = 1; // player forward acceleration
const playerBrake = -3; // player breaking acceleration
const turnControl = .2; // player turning rate
const jumpAccel = 25; // z speed added for jump
const springConstant = .01; // spring players pitch
const collisionSlow = .1; // slow down from collisions
const pitchLerp = .1; // rate camera pitch changes
const pitchSpringDamp = .9; // dampen the pitch spring
const elasticity = 1.2; // bounce elasticity
const centrifugal = .002; // how much turns pull player
const forwardDamp = .999; // dampen player z speed
const lateralDamp = .7; // dampen player x speed
const offRoadDamp = .98; // more damping when off road
const gravity = -1; // gravity to apply in y axis
const cameraTurnScale = 2; // how much to rotate camera
const worldRotateScale = .00005; // how much to rotate world
// level settings
const maxTime = 20; // time to start
const checkPointTime = 10; // add time at checkpoints
const checkPointDistance = 1e5; // how far between checkpoints
const maxDifficultySegment = 9e3; // how far until max difficulty
const roadEnd = 1e4; // how far until end of road
//////////////////////////////////////////////////////////////////
// mouse input
//////////////////////////////////////////////////////////////////
mouseDown =
mousePressed =
mouseUpFrames =
mouseX = 0;
onmouseup =e=> mouseDown = 0;
onmousedown =e=> mousePressed ? mouseDown = 1 : mousePressed = 1;
onmousemove =e=> mouseX = e.x/window.innerWidth*2 - 1;
//////////////////////////////////////////////////////////////////
// math and helper functions
//////////////////////////////////////////////////////////////////
Clamp =(v, a, b) => Math.min(Math.max(v, a), b);
ClampAngle=(a) => (a+PI) % (2*PI) + (a+PI<0? PI : -PI);
Lerp=(p, a, b)=> a + Clamp(p, 0, 1) * (b-a);
R =(a=1, b=0) => Lerp((Math.sin(++randSeed)+1)*1e5%1,a,b);
LSHA =(l,s=0,h=0,a=1)=>`hsl(${h+hueShift},${s}%,${l}%,${a})`;
// simple 3d vector class
class Vec3
{
constructor(x=0, y=0, z=0) {this.x = x; this.y = y; this.z = z;}
Add=(v)=>(
v = v < 1e5 ? new Vec3(v,v,v) : v,
new Vec3( this.x + v.x, this.y + v.y, this.z + v.z ));
Multiply=(v)=>(
v = v < 1e5 ? new Vec3(v,v,v) : v,
new Vec3( this.x * v.x, this.y * v.y, this.z * v.z ));
}
// draw a trapazoid shaped poly
DrawPoly=(x1, y1, w1, x2, y2, w2, fillStyle)=>
{
context.beginPath(context.fillStyle = fillStyle);
context.lineTo(x1-w1, y1|0);
context.lineTo(x1+w1, y1|0);
context.lineTo(x2+w2, y2|0);
context.lineTo(x2-w2, y2|0);
context.fill();
}
// draw outlined hud text
DrawText=(text, posX)=>
{
// scale text so it works in tiny CodePen iframe
const size = c.height/79;
context.font = size+'em impact'; // set font size
context.fillStyle = LSHA(99,0,0,.5); // set font color
context.fillText(text, posX, size*14); // fill text
context.lineWidth = size/2.5; // line width
context.strokeText(text, posX, size*14); // outline text
/*
context.font = '9em impact'; // set font size
context.fillStyle = LSHA(99,0,0,.5); // set font color
context.fillText(text, posX, 129); // fill text
context.lineWidth = 3; // line width
context.strokeText(text, posX, 129); // outline text
*/
}
//////////////////////////////////////////////////////////////////
// build the road with procedural generation
//////////////////////////////////////////////////////////////////
roadGenLengthMax = // end of section
roadGenLength = // distance left
roadGenTaper = // length of taper
roadGenFreqX = // X wave frequency
roadGenFreqY = // Y wave frequency
roadGenScaleX = // X wave amplitude
roadGenScaleY = 0; // Y wave amplitude
roadGenWidth = roadWidth; // starting road width
startRandSeed = randSeed = Date.now(); // set random seed
road = []; // clear road
// generate the road
for( i = 0; i < roadEnd*2; ++i ) // build road past end
{
if (roadGenLength++ > roadGenLengthMax) // is end of section?
{
// calculate difficulty percent
d = Math.min(1, i/maxDifficultySegment);
// randomize road settings
roadGenWidth = roadWidth*R(1-d*.7,3-2*d); // road width
roadGenFreqX = R(Lerp(d,.01,.02)); // X curves
roadGenFreqY = R(Lerp(d,.01,.03)); // Y bumps
roadGenScaleX = i>roadEnd ? 0 : R(Lerp(d,.2,.6));// X scale
roadGenScaleY = R(Lerp(d,1e3,2e3)); // Y scale
// apply taper and move back
roadGenTaper = R(99, 1e3)|0; // random taper
roadGenLengthMax = roadGenTaper + R(99,1e3); // random length
roadGenLength = 0; // reset length
i -= roadGenTaper; // subtract taper
}
// make a wavy road
x = Math.sin(i*roadGenFreqX) * roadGenScaleX;
y = Math.sin(i*roadGenFreqY) * roadGenScaleY;
road[i] = road[i]? road[i] : {x:x, y:y, w:roadGenWidth};
// apply taper from last section and lerp values
p = Clamp(roadGenLength / roadGenTaper, 0, 1);
road[i].x = Lerp(p, road[i].x, x);
road[i].y = Lerp(p, road[i].y, y);
road[i].w = i > roadEnd ? 0 : Lerp(p, road[i].w, roadGenWidth);
// calculate road pitch angle
road[i].a = road[i-1] ?
Math.atan2(road[i-1].y-road[i].y, segmentLength) : 0;
}
//////////////////////////////////////////////////////////////////
// init game
//////////////////////////////////////////////////////////////////
// reset everything
velocity = new Vec3
( pitchSpring = pitchSpringSpeed = pitchRoad = hueShift = 0 );
position = new Vec3(0, height); // set player start pos
nextCheckPoint = checkPointDistance; // init next checkpoint
time = maxTime; // set the start time
heading = randSeed; // random world heading
//////////////////////////////////////////////////////////////////
// update and render frame
//////////////////////////////////////////////////////////////////
Update=()=>
{
// get player road segment
s = position.z / segmentLength | 0; // current road segment
p = position.z / segmentLength % 1; // percent along segment
// get lerped values between last and current road segment
roadX = Lerp(p, road[s].x, road[s+1].x);
roadY = Lerp(p, road[s].y, road[s+1].y) + height;
roadA = Lerp(p, road[s].a, road[s+1].a);
// update player velocity
lastVelocity = velocity.Add(0);
velocity.y += gravity;
velocity.x *= lateralDamp;
velocity.z = Math.max(0, time?forwardDamp*velocity.z:0);
// add velocity to position
position = position.Add(velocity);
// limit player x position (how far off road)
position.x = Clamp(position.x, -maxPlayerX, maxPlayerX);
// check if on ground
if (position.y < roadY)
{
position.y = roadY; // match y to ground plane
airFrame = 0; // reset air frames
// get the dot product of the ground normal and the velocity
dp = Math.cos(roadA)*velocity.y + Math.sin(roadA)*velocity.z;
// bounce velocity against ground normal
velocity = new Vec3(0, Math.cos(roadA), Math.sin(roadA))
.Multiply(-elasticity * dp).Add(velocity);
// apply player brake and accel
velocity.z +=
mouseDown? playerBrake :
Lerp(velocity.z/maxSpeed, mousePressed*playerAccel, 0);
// check if off road
if (Math.abs(position.x) > road[s].w)
{
velocity.z *= offRoadDamp; // slow down
pitchSpring += Math.sin(position.z/99)**4/99; // rumble
}
}
// update player turning and apply centrifugal force
turn = Lerp(velocity.z/maxSpeed, mouseX * turnControl, 0);
velocity.x +=
velocity.z * turn -
velocity.z ** 2 * centrifugal * roadX;
// update jump
if (airFrame++<6 && time
&& mouseDown && mouseUpFrames && mouseUpFrames<9)
{
velocity.y +=jumpAccel; // apply jump velocity
airFrame=9; // prevent jumping again
}
mouseUpFrames=mouseDown? 0 : mouseUpFrames+1;
// pitch down with vertical velocity when in air
airPercent=(position.y-roadY) / 99;
pitchSpringSpeed +=Lerp(airPercent, 0, velocity.y/4e4);
// update player pitch spring
pitchSpringSpeed +=(velocity.z - lastVelocity.z)/2e3;
pitchSpringSpeed -=pitchSpring * springConstant;
pitchSpringSpeed *=pitchSpringDamp;
pitchSprin.........完整代码请登录后点击上方下载按钮下载查看
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