HTML5 game development - Zero-based development of RPG games - Open source lecture (3) - Scroll & dialogue implementation

In the first two articles, the development of RPG has realized adding maps and adding game characters. This article will realize the scroll scrolling of the map and the realization of character dialogue. The effect is as follows

Scrolling of the map

For the scrolling principle of the map, you can refer to the figure below

Follow the instructions in the above picture to implement map scrolling. You only need to draw the upcoming map (the yellow part in Picture) first. Then scroll the map. After the map is scrolled, remove the part outside the screen (the green part in the picture)

First, add a variable to control whether the map scrolls

//地图滚动
var mapmove = false;

Then, when the character moves, determine whether the map needs to scroll

/**
 * 地图是否滚动
 **/
Character.prototype.checkMap = function (dir){
	var self = this;
	mapmove = false;
	//如果不是英雄，则地图不需要滚动
	if(!self.isHero)return;
	
	switch (dir){
		case UP:
			if(self.y + charaLayer.y> STEP)break;
			if(mapLayer.y >= 0)break;
			addMap(0,-1);
			mapmove = true;
			break;
		case LEFT:
			if(self.x + charaLayer.x > STEP)break;
			if(mapLayer.x >= 0)break;
			addMap(-1,0);
			mapmove = true;
			break;
		case RIGHT:
			if(self.x < 480 - 2*STEP)break;
			if(480 - mapLayer.x >= map[0].length*STEP)break;
			addMap(1,0);
			mapmove = true;
			break;
		case DOWN:
			if(self.y < 288 - 2*STEP)break;
			if(288 - mapLayer.y >= map.length*STEP)break;
			addMap(0,1);
			mapmove = true;
			break;
	}
};

During the movement, determine whether the map is in Scroll state, if the map is scrolling, scroll the map, otherwise move the character

/**
 * 开始移动 
 **/
Character.prototype.onmove = function (){
	var self = this;
	//设定一个移动步长中的移动次数
	var ml_cnt = 4;
	//计算一次移动的长度
	var ml = STEP/ml_cnt;
	//根据移动方向，开始移动
	switch (self.direction){
		case UP:
			if(mapmove){
				mapLayer.y += ml;
				charaLayer.y += ml;
			}
			self.y -= ml;
			break;
		case LEFT:
			if(mapmove){
				mapLayer.x += ml;
				charaLayer.x += ml;
			}
			self.x -= ml;
			break;
		case RIGHT:
			if(mapmove){
				mapLayer.x -= ml;
				charaLayer.x -= ml;
			}
			self.x += ml;
			break;
		case DOWN:
			if(mapmove){
				mapLayer.y -= ml;
				charaLayer.y -= ml;
			}
			self.y += ml;
			break;
	}
	self.moveIndex++;
	//当移动次数等于设定的次数，开始判断是否继续移动
	if(self.moveIndex >= ml_cnt){
		//一个地图步长移动完成后，如果地图处于滚动状态，则移除多余地图块
		if(mapmove)delMap();
		self.moveIndex = 0;
		//如果已经松开移动键，或者前方为障碍物，则停止移动，否则继续移动
		if(!isKeyDown || !self.checkRoad()){
			self.move = false;
			return;
		}else if(self.direction != self.direction_next){
			self.direction = self.direction_next;
			self.anime.setAction(self.direction);
		}
		//地图是否滚动
		self.checkMap(self.direction);
	}
};

Finally, expand the map's array and terrain to be larger than the screen size

//地图图片数组
var map = [
[18,18,18,18,18,18,18,18,18,18,18,18,55,55,18,18,18],
[18,18,18,17,17,17,17,17,17,17,17,17,55,55,17,17,18],
[18,18,17,17,17,17,18,18,17,17,17,17,55,55,17,17,18],
[18,17,17,17,18,18,18,18,18,17,17,55,55,17,17,17,18],
[18,17,17,18,22,23,23,23,24,18,17,55,55,17,17,17,18],
[18,17,17,18,25,28,26,79,27,18,55,55,17,17,17,17,18],
[18,17,17,17,17,10,11,12,18,18,55,55,17,17,17,17,18],
[18,18,17,17,10,16,16,16,11,55,55,17,17,17,17,17,18],
[18,18,17,17,77,16,16,16,16,21,21,17,17,17,17,17,18],
[18,18,17,17,77,16,16,16,16,55,55,17,17,17,17,17,18],
[18,18,18,18,18,18,18,18,18,55,55,18,18,18,18,18,18]
];
//地图地形数组
var mapdata = [
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
[1,1,1,0,0,0,0,0,0,0,0,0,1,1,0,0,1],
[1,1,0,0,0,0,1,1,0,0,0,0,1,1,0,0,1],
[1,0,0,0,1,1,1,1,1,0,0,1,1,0,0,0,1],
[1,0,0,1,1,1,1,1,1,1,0,1,1,0,0,0,1],
[1,0,0,1,1,1,0,1,1,1,1,1,0,0,0,0,1],
[1,0,0,0,0,0,0,0,1,1,1,1,0,0,0,0,1],
[1,1,0,0,0,0,0,0,0,1,1,0,0,0,0,0,1],
[1,1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1],
[1,1,0,0,0,0,0,0,0,1,1,0,0,0,0,0,1],
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
];

In order to realize map scrolling, modify the method of adding a map and add the yellow map part of the above picture according to the parameters

//添加地图
function addMap(cx,cy){
	var i,j,index,indexX,indexY;
	var bitmapdata,bitmap;
	var mapX = mapLayer.x / STEP;
	var mapY = mapLayer.y / STEP;
	var mx = cx<0?-1:0,my = cy<0?-1:0;
	if(imageArray == null){
		//地图图片数据
		bitmapdata = new LBitmapData(imglist["map"]);
		//将地图图片拆分，得到拆分后的各个小图片的坐标数组
		imageArray = LGlobal.pideCoordinate(bitmapdata.image.width,bitmapdata.image.height,10,10);
	}
	mapLayer.removeAllChild();
	//在地图层上，画出15*10的小图片
	for(i=my;i<9 +Math.abs(cy) && i-mapY < map.length;i++){
		for(j=mx;j<15 +Math.abs(cx)&& j-mapX < map[0].length;j++){
			//从地图数组中得到相应位置的图片坐标
			index = map[i-mapY][j-mapX];
			//小图片的竖坐标
			indexY = Math.floor(index /10);
			//小图片的横坐标
			indexX = index - indexY*10;
			//得到小图片
			bitmapdata = new LBitmapData(imglist["map"],indexX*32,indexY*32,32,32);
			bitmap = new LBitmap(bitmapdata);
			//设置小图片的显示位置
			bitmap.x = j*STEP - mapLayer.x;
			bitmap.y = i*STEP - mapLayer.y;
			//将小图片显示到地图层
			mapLayer.addChild(bitmap);
		}
	}
}
//移除多余地图块
function delMap(){
	var bitmap,i;
	for(i=0;i<mapLayer.childList.length;i++){
		bitmap = mapLayer.childList[i];
		if(bitmap.x + mapLayer.x < 0 || bitmap.x + mapLayer.x >= 480 || 
				bitmap.y + mapLayer.y < 0 || bitmap.y + mapLayer.y >= 288){
			mapLayer.removeChild(bitmap);
			i--;
		}
	}
}

Look at the effect as follows

Character dialogue

Implementation of dialogue, when clicking the square button of the control button Add, so first, when the mouse is raised , determine whether the square button

## is clicked #

function onup(event){
	isKeyDown = false;
	if(event.offsetX >= ctrlLayer.x + 280 && event.offsetX <= ctrlLayer.x+330){
		if(event.offsetY >= ctrlLayer.y+40 && event.offsetY <= ctrlLayer.y+100){
			//对话
			addTalk();
		}
	}
}

When improving the addTalk() method, first prepare the content of the conversation

var talkScriptList = {
	"talk1":new Array(
		{img:"m",name:"鸣人",msg:"我是木叶村的鸣人，你是谁？"},
		{img:"n",name:"黑衣忍者甲",msg:"你就是鸣人？九尾还在你身体里吗？"}
		),
	"talk2":new Array(
		{img:"n",name:"黑衣忍者乙",msg:"鸣人，听说忍者大战就要开始了。"},
		{img:"m",name:"鸣人",msg:"真的吗？一定要想想办法啊。"}
		)
};

talk1, talk2 The following numbers represent the number of the character. The img of each dialogue unit is the avatar of the character, name is the name of the character, and msg is the content of the dialogue.

The way to add dialogue is to judge the character after clicking the square button. Is there anyone in front of Naruto? If there is someone, take out the number of the character, get the corresponding dialogue content from the above array, and then display the corresponding content on the game screen. The specific implementation code is as follows

//对话内容
var talkScript;
var talkScriptList = {
	"talk1":new Array(
		{img:"m",name:"鸣人",msg:"我是木叶村的鸣人，你是谁？"},
		{img:"n",name:"黑衣忍者甲",msg:"你就是鸣人？九尾还在你身体里吗？"}
		),
	"talk2":new Array(
		{img:"n",name:"黑衣忍者乙",msg:"鸣人，听说忍者大战就要开始了。"},
		{img:"m",name:"鸣人",msg:"真的吗？一定要想想办法啊。"}
		)
};
//对话序号
var talkIndex = 0;
//对话中
var talking = false;

/**
 * 添加对话
 * */
function addTalk(){
	//如果对话内容为空，则开始判断是否可以对话
	if(talkScript == null){
		var key,tx = player.x,ty = player.y;
		switch (player.direction){
		case UP:
			ty -= STEP;
			break;
		case LEFT:
			tx -= STEP;
			break;
		case RIGHT:
			tx += STEP;
			break;
		case DOWN:
			ty += STEP;
			break;
		}
		for(key in charaLayer.childList){
			//判断前面又没有npc，有则开始对话
			if(charaLayer.childList[key].x == tx && charaLayer.childList[key].y == ty){
				if(talkScriptList["talk"+charaLayer.childList[key].index]){
					talkScript = talkScriptList["talk"+charaLayer.childList[key].index];
					talkIndex = 0;
				}
			}
		}
		//如果前方没有npc，则返回
		if(talkScript == null)return;
	}
	//将对话层清空
	talkLayer.removeAllChild();
	//当对话开始，且按照顺序进行对话
	if(talkIndex < talkScript.length){
		//得到对话内容
		var talkObject = talkScript[talkIndex];
		//对话背景
		bitmapdata = new LBitmapData(imglist["talk"]);
		bitmap = new LBitmap(bitmapdata);
		bitmap.width = 330;
		bitmap.height = 70;
		bitmap.x = 100;
		bitmap.y = 20;
		bitmap.alpha = 0.7;
		talkLayer.addChild(bitmap);
		//对话头像
		bitmapdata = new LBitmapData(imglist[talkObject.img]);
		bitmap = new LBitmap(bitmapdata);
		bitmap.x = 0;
		bitmap.y = 0;
		talkLayer.addChild(bitmap);
		//对话人物名称
		var name = new LTextField();
		name.x = 110;
		name.y = 30;
		name.size = "14";
		name.color = "#FFFFFF";
		name.text = "[" + talkObject.name + "]";
		talkLayer.addChild(name);
		//对话内容
		var msg = new LTextField();
		msg.x = 110;
		msg.y = 55;
		msg.color = "#FFFFFF";
		msg.text = talkObject.msg;
		talkLayer.addChild(msg);
		//对话内容逐字显示
		msg.wind();
		talkLayer.x = 20;
		talkLayer.y = 50;
		talkIndex++;
	}else{
		//对话结束
		talkScript = null;
	}
}

The effect is shown in the picture below

##Game Demo address

http://lufylegend.com/demo/rpg/index.html

lufylegend.js engine package contains this demo, please download the lufylegend.js engine directly and view the source code in the engine package

lufylegend.js engine download address

##http://lufylegend .com/lufylegend

##The above is html5 game development - zero-based development RPG Game - Open Source Lecture (3) - Scroll & Dialogue Implementation. For more related content, please pay attention to the PHP Chinese website (www.php.cn)!