From 6a1f368f3731be09e1563b90f9367fa0d79f9738 Mon Sep 17 00:00:00 2001
From: leca <leca@foxarmy.org>
Date: Sun, 30 Jul 2023 21:19:35 +0300
Subject: [PATCH] Added index.html

---
 index.html | 156 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 156 insertions(+)
 create mode 100644 index.html
diff --git a/index.html b/index.html
new file mode 100644
index 0000000..0bd49cf
--- /dev/null
+++ b/index.html
@@ -0,0 +1,156 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <title>Pixel Battle</title>
+        <meta charset="UTF-8">
+
+    </head>
+    <body>
+        <canvas id="board" width="1920" height="1080" style="border:1px solid #000000;" display="block">
+        <canvas hidden id="hidden" width="1920" height="1080" style="border:1px solid #000000;" display="block">
+
+        </canvas>
+        <script>
+        var canvas = document.getElementById("board");
+        var canvasHidden = document.getElementById("hidden");
+        var ctx = canvas.getContext("2d");
+        var ctx2 = canvasHidden.getContext("2d");
+        canvas.width = 1920;
+        canvas.height = 1080;
+        var imgData = ctx2.createImageData(canvasHidden.width, canvasHidden.height)
+
+        // All the code that is making zooms and moving around cavnas is made with big help of http://phrogz.net/tmp/canvas_zoom_to_cursor.html. Thanks alot!
+        window.onload = function() {
+            var ctx = canvas.getContext("2d");
+            trackTransforms(ctx);
+            function redraw(x ,y) {
+                ctx.save();
+                ctx.setTransform(1,0,0,1,0,0);
+                ctx.clearRect(0,0,canvas.width,canvas.height);
+                ctx.restore();
+                for (let i = 0; i < 1000; i += 4) {
+                    imgData.data[i+0] = 255;
+                    imgData.data[i+1] = 0;
+                    imgData.data[i+2] = 0;
+                    imgData.data[i+3] = 255;
+                }
+                ctx2.putImageData(imgData, 10, 50);
+                ctx.drawImage(canvasHidden, 0, 0)
+            }
+
+            function drawPixel(x, y, color) {
+                let pixelNumber = y * canvas.width + x // THIS IS NOT CORRECT. MUST BE FIXED
+                for (let i = 0; i < 4; i ++) 
+                    imgData.data[pixelNumber+i] = color[i]
+                redraw();
+            }
+
+            redraw();
+
+            var lastX=canvas.width/2, lastY=canvas.height/2;
+            var dragStart,dragged;
+            canvas.addEventListener('mousedown',function(evt){
+                document.body.style.mozUserSelect = document.body.style.webkitUserSelect = document.body.style.userSelect = 'none';
+                lastX = evt.offsetX || (evt.pageX - canvas.offsetLeft);
+                lastY = evt.offsetY || (evt.pageY - canvas.offsetTop);
+                dragStart = ctx.transformedPoint(lastX,lastY);
+                dragged = false;
+                
+            },false);
+            canvas.addEventListener('mousemove',function(evt){
+                lastX = evt.offsetX || (evt.pageX - canvas.offsetLeft);
+                lastY = evt.offsetY || (evt.pageY - canvas.offsetTop);
+                dragged = true;
+                if (dragStart){
+                    var pt = ctx.transformedPoint(lastX,lastY);
+                    ctx.translate(pt.x-dragStart.x,pt.y-dragStart.y);
+                    redraw();
+                }
+            },false);
+            canvas.addEventListener('mouseup',function(evt){
+                dragStart = null;
+                
+                if (!dragged) drawPixel(
+                    Math.round(ctx.transformedPoint(lastX,lastY).x), 
+                    Math.round(ctx.transformedPoint(lastX,lastY).y)
+                )
+                // if (!dragged) zoom(evt.shiftKey ? -1 : 1 );
+            },false);
+
+            var scaleFactor = 1.1;
+            var zoom = function(clicks){
+                var pt = ctx.transformedPoint(lastX,lastY);
+                ctx.translate(pt.x,pt.y);
+                var factor = Math.pow(scaleFactor,clicks);
+                ctx.scale(factor,factor);
+                ctx.translate(-pt.x,-pt.y);
+                redraw();
+            }
+
+            var handleScroll = function(evt){
+                var delta = evt.wheelDelta ? evt.wheelDelta/40 : evt.detail ? -evt.detail : 0;
+                if (delta) zoom(delta);
+                return evt.preventDefault() && false;
+            };
+            canvas.addEventListener('DOMMouseScroll',handleScroll,false);
+            canvas.addEventListener('mousewheel',handleScroll,false);
+        };
+        
+        function trackTransforms(ctx){
+		var svg = document.createElementNS("http://www.w3.org/2000/svg",'svg');
+		var xform = svg.createSVGMatrix();
+		ctx.getTransform = function(){ return xform; };
+		
+		var savedTransforms = [];
+		var save = ctx.save;
+		ctx.save = function(){
+			savedTransforms.push(xform.translate(0,0));
+			return save.call(ctx);
+		};
+		var restore = ctx.restore;
+		ctx.restore = function(){
+			xform = savedTransforms.pop();
+			return restore.call(ctx);
+		};
+
+		var scale = ctx.scale;
+		ctx.scale = function(sx,sy){
+			xform = xform.scaleNonUniform(sx,sy);
+			return scale.call(ctx,sx,sy);
+		};
+		var rotate = ctx.rotate;
+		ctx.rotate = function(radians){
+			xform = xform.rotate(radians*180/Math.PI);
+			return rotate.call(ctx,radians);
+		};
+		var translate = ctx.translate;
+		ctx.translate = function(dx,dy){
+			xform = xform.translate(dx,dy);
+			return translate.call(ctx,dx,dy);
+		};
+		var transform = ctx.transform;
+		ctx.transform = function(a,b,c,d,e,f){
+			var m2 = svg.createSVGMatrix();
+			m2.a=a; m2.b=b; m2.c=c; m2.d=d; m2.e=e; m2.f=f;
+			xform = xform.multiply(m2);
+			return transform.call(ctx,a,b,c,d,e,f);
+		};
+		var setTransform = ctx.setTransform;
+		ctx.setTransform = function(a,b,c,d,e,f){
+			xform.a = a;
+			xform.b = b;
+			xform.c = c;
+			xform.d = d;
+			xform.e = e;
+			xform.f = f;
+			return setTransform.call(ctx,a,b,c,d,e,f);
+		};
+		var pt  = svg.createSVGPoint();
+		ctx.transformedPoint = function(x,y){
+			pt.x=x; pt.y=y;
+			return pt.matrixTransform(xform.inverse());
+		}
+	}
+    </script>
+    </body>
+</html>
\ No newline at end of file
