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Javascript game development: 'Three Kingdoms Cao Cao Biography' component development (5) Implementation of movable maps_javascript skills
Javascript game development: 'Three Kingdoms Cao Cao Biography' component development (5) Implementation of movable maps_javascript skills
May 16, 2016 pm 05:42 PM
1. Introduction
The content of this lecture is very simple, and everyone will understand it faster. Therefore, I will only analyze the key points, and it is your turn to think about the rest! First of all, I don’t have much experience in game development, because today’s programmers love to use canvas, but I can only make up a few divs. But it doesn’t matter, because the result is still a game. ha! I've been talking a lot lately, I hope you'll forgive me. Next, please look at the code analysis.2. Code explanation
Today I will adjust the order of explanation. Look at the code first and then the pictures.This is the content in slg.js:
var subtractedMargin = 0;
var subtractedMarginL = 0;
var mousedown = 0;
var toright;
var toleft; >
window.onmouseup = function(){
mousedown = 0;
clearInterval(toright);
clearInterval(toleft);
clearInterval(todown);
clearInterval (toup);
}
function mapMove(direction)
{
switch(direction){
case "down":
subtractedMargin -= 15;
$("#ID_IMG_MAP").animate({marginTop: subtractedMargin "px"}, 120);
break;
case "up":
subtractedMargin = 15 ;
$("#ID_IMG_MAP").animate({marginTop: subtractedMargin "px"}, 120);
break;
case "right":
subtractedMarginL -= 15;
$("#ID_IMG_MAP").animate({marginLeft: subtractedMarginL "px"}, 120);
break;
case " left":
subtractedMarginL = 15;
$("#ID_IMG_MAP").animate({marginLeft: subtractedMarginL "px"}, 120);
break;
}
if(subtractedMarginL < -415){
clearInterval(toright);
clearInterval(toleft);
}
if(subtractedMarginL > -20){
clearInterval(toright);
clearInterval(toleft);
}
if(subtractedMargin < -640){
clearInterval(todown);
clearInterval(toup);
}
if(subtractedMargin > -20){
clearInterval(todown);
clearInterval(toup);
}
}
$("body") .ready(function(){
$("#ID_DIV_TORIGHT").mousedown(function(){
mousedown = 1;
if(subtractedMarginL > -415 && mousedown == 1) {
mapMove("right");
toright = setInterval(function(){mapMove("right");}, 120);
}
});
$("#ID_DIV_TOLEFT").mousedown(function(){
mousedown = 1;
if(subtractedMarginL < -20 && mousedown == 1){
mapMove(" left");
toleft = setInterval(function(){mapMove("left");}, 120);
}
});
$("#ID_DIV_TODOWN") .mousedown(function(){
mousedown = 1;
if(subtractedMargin > -640 && mousedown == 1){
mapMove("down");
todown = setInterval (function(){mapMove("down");}, 120);
}
});
$("#ID_DIV_TOUP").mousedown(function(){
mousedown = 1;
if(subtractedMargin < -20 && mousedown == 1){
mapMove("up");
toup = setInterval(function(){mapMove("up" );}, 120);
}
});
});
When you see the title of this article, you will definitely not understand the meaning of the title because it is too abstract . Now let me explain: Movable means that you can move in all directions. A map is a map. It can be a world map, a Chinese map, or a game map. . . It has to be a picture anyway. I have to say a few more words here, but it doesn’t matter, because it is much better to understand the situation than not knowing the true face of Mount Lu.
Next I will publish the html code again, because this time the html code is very important:
現(xiàn)在大家可以對照兩段代碼看，值得注意得是有一點：在html代碼中，我把一張圖片放入了div，這時div原本是不會遮蓋住圖片的，但當(dāng)你加上overflow: hidden;時就可以遮蓋住圖片了。
在這個程序中為了點擊邊框附近就能使地圖移動，我用了四個div壓住圖片四邊，當(dāng)邊框附近被點擊時，就等于點了div，點了div就會調(diào)動相應(yīng)函數(shù)。這樣做雖然技術(shù)會有點差，不過也是一個好辦法。
另一點值得注意得是：當(dāng)點擊邊框附近調(diào)用函數(shù)時，我用了一個很特別的方法讓地圖一直移動，除非你松開鼠標(biāo)。這個方法就是用setInterval()等待幾秒后又移動，setInterval()又是個不停循環(huán)的東東，于是就一直調(diào)用下去，當(dāng)松開鼠標(biāo)時，就用clearInterval();讓setInterval()停下，于是，這個環(huán)節(jié)搞定了?。?！哈哈哈。
對了，不忘把圖片給大家，圖片有點大。。。
?
三、演示效果
先看演示圖片：
然后是：
?
演示地址：
注意：進入demo后點擊圖片邊緣便可以移動地圖。
希望大家多支持！謝謝！
“用Javascript開發(fā)《三國志曹操傳》”系列文章差不多到此就該結(jié)束了，下次我們來研究研究html5游戲開發(fā)。相信那更是智慧的挑戰(zhàn)。敬請期待！---Yorhom Wang
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