我已經創建了一個側面滾動遊戲,其中包括一個平移「照相機」和一個移動的精靈。平移「照相機」是由與主精靈的相反方向移動的障礙物產生的效果。問題在於精靈不在一個位置;它不斷在屏幕上移動,最終離開視野。 我希望精靈似乎在移動,但實際上它被設置在一個位置,因此它不會從視圖中移出屏幕。如何讓移動的精靈集中在屏幕上?
代碼移動雪碧:
ctx.beginPath();
ctx.moveTo(positionX - small, positionY - large);
ctx.lineTo(positionX + small, positionY - large);
ctx.lineTo(positionX + small, positionY);
ctx.lineTo(positionX - small, positionY);
ctx.closePath();
ctx.stroke();
小變量等於10,大變量等於20.這些變量在這裏是因爲我們隨着時間的推移精靈的大小變化。
守則「攝像機」:
function drawSquare1() {
ctx.beginPath();
ctx.rect(250 - positionX, 145, 30, 30);
ctx.fillStyle = "#FF0000";
ctx.fill();
ctx.closePath();
}
這些代碼行創建在我們的遊戲中移動的障礙物。 具體行:
ctx.rect(250 - positionX, 145, 30, 30
創建移動的「相機」錯覺。
所有代碼:
<!DOCTYPE html>
<html>
<body>
<canvas id="canvas" width="2000" height="2000"></canvas>
<script>
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
var positionX = 50.0;
var positionY = 175.0;
var velocityX = 2;
var velocityY = 0.0;
var gravity = 0.5;
var onGround = false;
var deaths = 0;
var points = 0;
var color = "#DCD93C";
var change1 = 175;
//circle 1
var point1x1 = 339;
var point1x2 = 372;
var point1y1 = 90;
var point1y2 = 150;
var circlex1 = 350;
var circley1 = 100;
//circle 2
var point2x1 = 565;
var point2x2 = 590;
var point2y1 = 90;
var point2y2 = 150;
var circlex2 = 575;
var circley2 = 100;
//circle 3
var point3x1 = 855;
var point3x2 = 880;
var point3y1 = 20;
var point3y2 = 50;
var circlex3 = 865;
var circley3 = 35;
//square size change
small = 10;
large = 20;
window.addEventListener("mousedown", StartJump, false);
window.addEventListener("mouseup", EndJump, false);
Loop();
function StartJump() {
if (onGround) {
velocityY = -12.0;
onGround = false;
}
}
function EndJump() {
if (velocityY < -6.0)
velocityY = -6.0;
}
function Loop() {
Update();
Render();
window.setTimeout(Loop, 30);
}
function Update() {
velocityY += gravity;
positionY += velocityY;
positionX += velocityX;
// Collision Detection //
if ((positionX > (239 - positionX) && positionX < (292 - positionX) && positionY > 145) || (positionX > (439 - positionX) && positionX < (492 - positionX) && positionY > 145) || (positionX > (639 - positionX) && positionX < (692 - positionX) && positionY > 145) || (positionX > (839 - positionX) && positionX < (892 - positionX) && positionY > 145) || (positionX > (839 - positionX) && positionX < (892 - positionX) && positionY > 50 && positionY < 100) || (positionX > (1039 - positionX) && positionX < (1700 - positionX) && positionY > 166 && positionY < 176)) {
positionY = 175;
positionX = 50;
deaths++;
points = 0;
small = 10;
large = 20;
// circle 1
circlex1 = 350;
circley1 = 100;
point1x1 = 339;
point1x2 = 372;
point1y1 = 90;
point1y2 = 150;
//circle 2
circlex2 = 575;
circley2 = 100;
point2x1 = 565;
point2x2 = 595;
point2y1 = 90;
point2y2 = 150;
//circle 3
point3x1 = 855;
point3x2 = 880;
point3y1 = 20;
point3y2 = 50;
circlex3 = 865;
circley3 = 35;
}
if (positionY > change1) {
positionY = change1;
velocityY = 0.0;
onGround = true;
}
// End World
if (positionX < 0 || positionX > 2000)
velocityX *= -1;
// Platform 1
if (positionX > (1039 - positionX) && positionX < (1300 - positionX) && positionY > 101 && positionY < 111)
{
change1 = 111;
}
if (positionX > (1300 - positionX))
{
change1 = 175;
}
//Platform 2
if (positionX > (1439 - positionX) && positionX < (1510 - positionX) && positionY > 81 && positionY < 101)
{
change1 = 91;
}
if (positionX > (1510 - positionX))
{
change1 = 175;
}
//Platform 3
if (positionX > (1600 - positionX) && positionX < (1750 - positionX) && positionY > 111 && positionY < 131)
{
change1 = 121;
}
if (positionX > (1750 - positionX))
{
change1 = 175;
}
// Point 1
if (positionX > (point1x1 - positionX) && positionX < (point1x2 - positionX) && positionY > point1y1 && positionY < point1y2) {
points++;
circlex1 = -10;
circley1 = -10;
point1x1 = -10;
point1x2 = -10;
point1y1 = -10;
point1y2 = -10;
small += -2;
large = small * 2;
}
// Point 2
if (positionX > (point2x1 - positionX) && positionX < (point2x2 - positionX) && positionY > point2y1 && positionY < point2y2) {
points++;
circlex2 = -10;
circley2 = -10;
point2x1 = -10;
point2x2 = -10;
point2y1 = -10;
point2y2 = -10;
small += -2;
large = small * 2;
}
// Point 3
if (positionX > (point3x1 - positionX) && positionX < (point3x2 - positionX) && positionY > point3y1 && positionY < point3y2) {
points++;
circlex3 = -10;
circley3 = -10;
point3x1 = -10;
point3x2 = -10;
point3y1 = -10;
point3y2 = -10;
small += -2;
large = small * 2;
}
// Gets Bigger One
if (positionX > (point1x1 - positionX) && positionX < (point1x2 - positionX) && positionY > 150) {
small += .2;
large = small * 2;
}
// Gets Bigger Two
if (positionX > (point2x1 - positionX) && positionX < (point2x2 - positionX) && positionY > 150) {
small += .2;
large = small * 2;
}
// Gets Bigger Three
if (positionX > (839 - positionX) && positionX < (892 - positionX) && positionY > 101 && positionY < 149) {
small += .2;
large = small * 2;
}
}
function drawPlatform1() {
ctx.beginPath();
ctx.rect(1050 - positionX, 111, 250, 10);
ctx.fillStyle = "#0066FF";
ctx.fill();
ctx.closePath();
}
function drawPlatform2() {
ctx.beginPath();
ctx.rect(1450 - positionX, 91, 60, 10);
ctx.fillStyle = "#0066FF";
ctx.fill();
ctx.closePath();
}
function drawPlatform3() {
ctx.beginPath();
ctx.rect(1600 - positionX, 121, 150, 10);
ctx.fillStyle = "#0066FF";
ctx.fill();
ctx.closePath();
}
function drawSquare1() {
ctx.beginPath();
ctx.rect(250 - positionX, 145, 30, 30);
ctx.fillStyle = "#FF0000";
ctx.fill();
ctx.closePath();
}
function drawCircle1() {
ctx.beginPath();
ctx.arc(circlex1 - positionX, circley1, 7, 7, 500);
ctx.fillStyle = color;
ctx.fill();
ctx.closePath();
}
function drawCircle2() {
ctx.beginPath();
ctx.arc(circlex2 - positionX, circley2, 7, 7, 500);
ctx.fillStyle = color;
ctx.fill();
ctx.closePath();
}
function drawCircle3() {
ctx.beginPath();
ctx.arc(circlex3 - positionX, circley3, 7, 7, 500);
ctx.fillStyle = color;
ctx.fill();
ctx.closePath();
}
function drawSquare2() {
ctx.beginPath();
ctx.rect(450 - positionX, 145, 30, 30);
ctx.fillStyle = "#FF0000";
ctx.fill();
ctx.closePath();
}
function drawSquare3() {
ctx.beginPath();
ctx.rect(650 - positionX, 145, 30, 30);
ctx.fillStyle = "#FF0000";
ctx.fill();
ctx.closePath();
}
function drawSquare5() {
ctx.beginPath();
ctx.rect(850 - positionX, 145, 30, 30);
ctx.fillStyle = "#FF0000";
ctx.fill();
ctx.closePath();
}
function drawSquare6() {
ctx.beginPath();
ctx.rect(1050 - positionX, 165, 700, 10);
ctx.fillStyle = "#FF0000";
ctx.fill();
ctx.closePath();
}
function drawSquare4() {
ctx.beginPath();
ctx.rect(850 - positionX, 50, 30, 30);
ctx.fillStyle = "#FF0000";
ctx.fill();
ctx.closePath();
}
function drawDeaths() {
ctx.font = "16px Arial";
ctx.fillStyle = "#0095DD";
ctx.fillText("Deaths: " + deaths, 10, 20);
}
function drawPoints() {
ctx.font = "16px Arial";
ctx.fillStyle = "#0095DD";
ctx.fillText("Points: " + points, 10, 50);
}
function Render() {
ctx.clearRect(0, 0, 2000, 2000);
drawPlatform1();
drawPlatform2();
drawPlatform3();
drawCircle1();
drawCircle2();
drawCircle3();
drawSquare1();
drawSquare2();
drawSquare3();
drawSquare4();
drawSquare5();
drawSquare6();
drawDeaths();
drawPoints();
ctx.beginPath();
ctx.moveTo(0, 175);
ctx.lineTo(2000, 175);
ctx.stroke();
ctx.beginPath();
ctx.moveTo(positionX - small, positionY - large);
ctx.lineTo(positionX + small, positionY - large);
ctx.lineTo(positionX + small, positionY);
ctx.lineTo(positionX - small, positionY);
ctx.closePath();
ctx.stroke();
}
</script>
</body>
</html>
@DarkBee我重申了我的問題,並進行了更多細節,因爲我認爲這是我的另一個問題的問題? – Mit
你應該刪除你的其他問題,然後......重構原始而不是重複會更好。 – Seth