Project 3

2021-11-24 21:55:54 +05:30
parent d673d78d5c
commit 19e50aa407
1 changed files with 89 additions and 0 deletions
@@ -0,0 +1,89 @@
+<!doctype html>
+<html>
+<head>
+    <title>Canvas HTML5</title>
+    <style>
+        #canvas {
+            border: 1px solid black;
+        }
+    </style>
+</head>
+<body>
+    <canvas id="canvas" width="600" height="400"></canvas>
+    <div>
+        <button class="save">Save</button>
+        <button class="clear">clear</button>
+        <span>Color: <input type="color" value="#ffff00" id="penColor"></span>
+        <span>Width: <input type="range" min="1" max="20" value="10" id="penWidth"></span>
+    </div>
+    <div class="output"></div>
+    <script>
+        const canvas = document.querySelector("#canvas");
+        const ctx = canvas.getContext("2d");
+        const penColor = document.querySelector("#penColor");
+        const penWidth = document.querySelector("#penWidth");
+        const btnSave = document.querySelector(".save");
+        const btnClear = document.querySelector(".clear");
+        const output = document.querySelector(".output");
+        const mLoc = {
+            draw: false,
+            x: 0,
+            y: 0,
+            lastX: 0,
+            lastY: 0
+        };
+        canvas.style.border = "1px solid black";
+        btnSave.addEventListener("click", saveImg);
+        btnClear.addEventListener("click", clearCanvas);
+        canvas.addEventListener("mousemove", (e) => {
+            mLoc.lastX = mLoc.x;
+            mLoc.lastY = mLoc.y;
+            //console.log(e);
+            mLoc.x = e.clientX;
+            mLoc.y = e.clientY;
+            draw();
+        })
+        canvas.addEventListener("mousedown", (e) => {
+            mLoc.draw = true;
+        })
+        canvas.addEventListener("mouseup", (e) => {
+            mLoc.draw = false;
+        })
+        canvas.addEventListener("mouseout", (e) => {
+            mLoc.draw = false;
+        })
+        function saveImg() {
+            const dataURL = canvas.toDataURL();
+            console.log(dataURL);
+            const img = document.createElement("img");
+            output.prepend(img);
+            img.setAttribute("src", dataURL);
+            const link = document.createElement("a");
+            output.append(link);
+            let fileName = Math.random().toString(16).substr(-8) + ".png"
+            link.setAttribute("download", fileName);
+            link.href = dataURL;
+            link.click();
+            output.removeChild(link);
+        }
+        function clearCanvas() {
+            let temp = confirm("clear canvas?");
+            if (temp) {
+                ctx.clearRect(0, 0, canvas.width, canvas.height);
+            }
+        }
+        function draw() {
+            if (mLoc.draw) {
+                ctx.beginPath();
+                ctx.moveTo(mLoc.lastX, mLoc.lastY);
+                ctx.lineTo(mLoc.x, mLoc.y);
+                ctx.strokeStyle = penColor.value;
+                ctx.lineWidth = penWidth.value;
+                ctx.stroke();
+                ctx.closePath();
+            }
+        }
+    </script>
+
+</body>
+</html>