class sinusScroll{scroll_pt=0;offset=0;font_width=16;font_height=13;display_max_width=1280;scroll_angle=0;constructor(info){this.scrolltext=info.msg??"NO TEXT";this.pos_y=info.pos_y??0;this.dispContext=info.dispContext;this.scroll_speed=info.scroll_speed??1;this.canvasBuffer=document.createElement('canvas');this.canvasBuffer.width=this.display_max_width+this.font_width;this.canvasBuffer.height=this.font_height;this.ctx_canvasBuffer=this.canvasBuffer.getContext("2d");this.canvasBufferTmp=document.createElement('canvas');this.canvasBufferTmp.width=this.canvasBuffer.width;this.canvasBufferTmp.height=this.canvasBuffer.height;this.ctx_canvasBufferTmp=this.canvasBufferTmp.getContext("2d");this.font=new Image();this.font.src="/gfx/font-16x13-alpha.png"}
dispFont(context,cx,cy,msg,zoom){context.imageSmoothingEnabled=!1;for(let n=0;n<msg.length;n++){let ptletter=parseInt(msg.charCodeAt(n))-32;context.drawImage(this.font,16*ptletter,0,this.font_width,this.font_height,cx+16*n*zoom,cy,16*zoom,13*zoom)}
context.imageSmoothingEnabled=!0}
run(){if(xtrInfo.isResize)this.resize(xtrInfo.screenWidth,xtrInfo.screenHeight);this.ctx_canvasBufferTmp.clearRect(0,0,this.canvasBufferTmp.width,this.canvasBufferTmp.height);this.ctx_canvasBufferTmp.drawImage(this.canvasBuffer,0,0,this.canvasBufferTmp.width,this.font_height,-this.scroll_speed,0,this.canvasBufferTmp.width,this.font_height);this.offset+=this.scroll_speed;if(this.offset>=this.font_width){this.offset=0;var croptext=this.scrolltext.substr(this.scroll_pt,1);this.scroll_pt++;if(this.scroll_pt==this.scrolltext.length){this.scroll_pt=0}
this.dispFont(this.ctx_canvasBufferTmp,this.canvasBufferTmp.width-this.font_width,0,croptext,1)}
this.ctx_canvasBuffer.clearRect(0,0,this.canvasBuffer.width,this.canvasBuffer.height);this.ctx_canvasBuffer.drawImage(this.canvasBufferTmp,0,0);this.scroll_angle+=8;for(let n=0;n<this.canvasBuffer.width;n++){let scrolly=Math.sin((n+this.scroll_angle)*Math.PI/180)*32+this.pos_y;this.dispContext.drawImage(this.canvasBuffer,n,0,1,this.canvasBuffer.height,n,scrolly,1,this.canvasBuffer.height)}}
resize(sw,sh){let old_sw=this.display_max_width;this.display_max_width=sw;let dist=sw-old_sw;this.canvasBuffer.width=this.display_max_width+this.font_width;this.ctx_canvasBuffer.drawImage(this.canvasBufferTmp,dist,0);this.canvasBufferTmp.width=this.canvasBuffer.width}}