Have you built a game by using Egretia engine? Here is an example from our developer community.
Demonstration
Programming
>Make a scrolling background
class BG extends egret.Sprite{
public bg:egret.Bitmap[] = [];
public fg:egret.Bitmap; //foreground
public vy:number; //scroll speed
public game:MainGame; //previous pointer
public constructor(game:MainGame) {
super();
this.game = game;
for(let i = 0 ; i < 2; i ++){
this.bg[i] = Main.createBitmapByName(“bg11_jpg”);
this.addChild(this.bg[i]);
//background position
this.bg[i].y = 0 — i* this.bg[i].height;
}
this.vy = 10; //scroll speed
}
public update(){
for(let i = 0 ; i < 2; i++){
//scroll down
this.bg[i].y+=this.vy;
// background images will be repeated once they move off the screen
if(this.bg[i].y > 800){
// the height of the background images indicates how much to scroll
this.bg[i].y -=2*this.bg[i].height;
}
}
}
}
The foreground is randomly composed of three different images
public resetFG(){
//Random 0~2 0 high ladder，1，2
let id = Math.floor(Math.random()*3);
switch(id){
case 0 :
this.fg.texture = RES.getRes(“bg12_png”);
if(Math.random()*100 < 50){// conspectus of 50%, left or right
this.fg.scaleX = -1;
this.fg.x = 480;
}else{
this.fg.scaleX = 1;
this.fg.x = 0;
}
break;
case 1:
this.fg.texture = RES.getRes(“bg13_png”);
this.fg.x = 480 — Math.random()*184;
this.fg.scaleX = 1;
break;
case 2 :
this.fg.texture = RES.getRes(“bg13_png”);
this.fg.x = Math.random() * 184;
this.fg.scaleX = -1;
break;
}
this.fg.y = -500 — Math.random()*100;
}
>Players control
Trajectory principle:
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