From bd01be7001f442296d2a9fe6389ab15f3641c84f Mon Sep 17 00:00:00 2001
From: Indrajith K L
Date: Thu, 19 Jan 2023 23:12:00 +0530
Subject: Integrates Codef Library * Adds StarField & 3D Lines * Style fixes to
 accommodate canvas * Adds Canvas container

Signed-off-by: Indrajith K L <mac91112@gmail.com>
---
 libs/codef_starfield.js | 150 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 150 insertions(+)
 create mode 100644 libs/codef_starfield.js

(limited to 'libs/codef_starfield.js')

diff --git a/libs/codef_starfield.js b/libs/codef_starfield.js
new file mode 100644
index 0000000..70e2c4d
--- /dev/null
+++ b/libs/codef_starfield.js
@@ -0,0 +1,150 @@
+/*------------------------------------------------------------------------------
+Copyright (c) 2011 Antoine Santo Aka NoNameNo
+
+This File is part of the CODEF project. (https://github.com/N0NameN0/CODEF)
+
+More info : http://codef.santo.fr
+Demo gallery http://www.wab.com
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+------------------------------------------------------------------------------*/
+
+function starfield3D(dest, nb, speed, w, h, centx, centy, color, ratio, offsetx, offsety){
+	this.dest=dest;
+	this.test=true;
+	this.n=nb;
+	this.star=new Array(this.n);
+	this.w=w;
+	this.h=h;
+	this.x=0;
+	this.y=0;
+	this.z=0;
+	this.offsetx=0;
+	this.offsety=0;
+	if(offsetx) this.offsetx=offsetx;
+	if(offsety) this.offsety=offsety;
+	this.centx=centx;
+	this.centy=centy;
+	this.color=color;
+	this.star_x_save,this.star_y_save;
+	this.star_speed=speed;
+	this.star_ratio=ratio;
+	this.star_color_ratio=0;
+	this.x=Math.round(this.w/2);
+	this.y=Math.round(this.h/2);
+	this.z=(this.w+this.h)/2;
+	this.star_color_ratio=1/this.z;
+	this.cursor_x=this.x;
+	this.cursor_y=this.y;
+
+	for(var i=0;i<this.n;i++){
+		this.star[i]=new Array(5);
+		this.star[i][0]=Math.random()*this.w*2-this.x*2;
+		this.star[i][1]=Math.random()*this.h*2-this.y*2;
+		this.star[i][2]=Math.round(Math.random()*this.z);
+		this.star[i][3]=0;
+		this.star[i][4]=0;
+	}
+
+	this.draw = function(){
+		var tmp=this.dest.contex.strokeStyle;
+		var tmp2 = this.dest.contex.globalAlpha;
+		var tmp3 = this.dest.contex.lineWidth;
+		this.dest.contex.globalAlpha=1;
+		this.dest.contex.strokeStyle=this.color;
+
+		for(var i=0;i<this.n;i++){
+			this.test=true;
+			this.star_x_save=this.star[i][3];
+			this.star_y_save=this.star[i][4];
+			this.star[i][0]+=(this.centx-this.x)>>4; if(this.star[i][0]>this.x<<1) { this.star[i][0]-=this.w<<1; this.test=false; } if(this.star[i][0]<-this.x<<1) { this.star[i][0]+=this.w<<1; this.test=false; }
+			this.star[i][1]+=(this.centy-this.y)>>4; if(this.star[i][1]>this.y<<1) { this.star[i][1]-=this.h<<1; this.test=false; } if(this.star[i][1]<-this.y<<1) { this.star[i][1]+=this.h<<1; this.test=false; }
+			this.star[i][2]-=this.star_speed; if(this.star[i][2]>this.z) { this.star[i][2]-=this.z; this.test=false; } if(this.star[i][2]<0) { this.star[i][2]+=this.z; this.test=false; }
+			this.star[i][3]=this.x+(this.star[i][0]/this.star[i][2])*this.star_ratio;
+			this.star[i][4]=this.y+(this.star[i][1]/this.star[i][2])*this.star_ratio;
+			if(this.star_x_save>0&&this.star_x_save<this.w&&this.star_y_save>0&&this.star_y_save<this.h&&this.test){
+				this.dest.contex.lineWidth=(1-this.star_color_ratio*this.star[i][2])*2;
+				this.dest.contex.beginPath();
+				this.dest.contex.moveTo(this.star_x_save+this.offsetx,this.star_y_save+this.offsety);
+				this.dest.contex.lineTo(this.star[i][3]+this.offsetx,this.star[i][4]+this.offsety);
+				this.dest.contex.stroke();
+				this.dest.contex.closePath();
+			}
+		}
+		this.dest.contex.strokeStyle=tmp;
+		this.dest.contex.globalAlpha=tmp2;
+		this.dest.contex.lineWidth=tmp3;
+	}
+
+	return this;
+
+}
+
+function starfield2D_dot(dst,params){
+	this.dst=dst;
+	this.stars=new Array();
+	var t=0;
+
+	for(var i=0; i<params.length; i++){
+		for(var j=0; j<params[i].nb; j++){
+			this.stars[t]={x:Math.random()*this.dst.canvas.width, y:Math.random()*this.dst.canvas.height, speedx:params[i].speedx, speedy:params[i].speedy, color:params[i].color, size:params[i].size};
+			t++;
+		}
+	}
+
+	this.draw=function(){
+		for(var i=0; i<this.stars.length; i++){
+			this.dst.plot(this.stars[i].x,this.stars[i].y,this.stars[i].size,this.stars[i].color);
+			this.stars[i].x+=this.stars[i].speedx;
+			this.stars[i].y+=this.stars[i].speedy;
+			if(this.stars[i].x>this.dst.canvas.width) this.stars[i].x=0;
+			if(this.stars[i].x<0) this.stars[i].x=this.dst.canvas.width;
+			if(this.stars[i].y>this.dst.canvas.height) this.stars[i].y=0;
+			if(this.stars[i].y<0) this.stars[i].y=this.dst.canvas.height;
+		}
+	}
+
+}
+
+function starfield2D_img(dst,img,params){
+	this.dst=dst;
+	this.stars=new Array();
+	this.img=img;
+	var t=0;
+
+	for(var i=0; i<params.length; i++){
+		for(var j=0; j<params[i].nb; j++){
+			this.stars[t]={x:Math.random()*this.dst.canvas.width, y:Math.random()*this.dst.canvas.height, speedx:params[i].speedx, speedy:params[i].speedy, params:params[i].params};
+			t++;
+		}
+	}
+
+	this.draw=function(){
+		for(var i=0; i<this.stars.length; i++){
+			this.dst.contex.drawImage(this.img[this.stars[i].params].img,this.stars[i].x,this.stars[i].y);
+			this.stars[i].x+=this.stars[i].speedx;
+			this.stars[i].y+=this.stars[i].speedy;
+			if(this.stars[i].x>this.dst.canvas.width) this.stars[i].x=0-this.img[this.stars[i].params].img.width;
+			if(this.stars[i].x<0-this.img[this.stars[i].params].img.width) this.stars[i].x=this.dst.canvas.width;
+			if(this.stars[i].y>this.dst.canvas.height) this.stars[i].y=0-this.img[this.stars[i].params].img.height;
+			if(this.stars[i].y<0-this.img[this.stars[i].params].img.height) this.stars[i].y=this.dst.canvas.height;
+		}
+	}
+
+}
-- 
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