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December 27, 2021 01:40
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Draw on a canvas
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| <html !doctype html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <script> | |
| function draw() { | |
| const canvas = document.getElementById("canvas"); | |
| const ctx = canvas.getContext("2d"); | |
| const widthElement = document.getElementById("width-input"); | |
| const widthStr = widthElement.value; | |
| const width = parseInt(widthStr, 10); | |
| const heightElement = document.getElementById("height-input"); | |
| const heightStr = heightElement.value; | |
| const height = parseInt(heightStr, 10); | |
| // validate wudth | |
| if(isNaN(width)) { | |
| console.log("Invalid width: ", width); | |
| return; | |
| } | |
| if(width < 1 || width > 1800) { | |
| console.log("Invalid width: ", width); | |
| return; | |
| } | |
| // validate height | |
| if(isNaN(height)) { | |
| console.log("Invalid height: ", height); | |
| return; | |
| } | |
| if(height < 1 || height > 1800) { | |
| console.log("Invalid height: ", height); | |
| return; | |
| } | |
| const startX = 0; | |
| const startY = 0; | |
| const endX = 0 + width; | |
| const endY = 0 + height; | |
| clearCanvas(ctx, canvas); | |
| // drawLine(ctx, startX, startY, endX, endY); | |
| drawRect(ctx, 10, 10, width, height); | |
| } | |
| function drawLine(ctx, x1, y1, x2, y2) { | |
| ctx.beginPath(); | |
| ctx.moveTo(x1, y1); | |
| ctx.lineTo(x2, y2); | |
| ctx.stroke(); | |
| } | |
| function drawRect(ctx, startX, startY, length, width) { | |
| const endX = startX + length; | |
| const endY = startY + width; | |
| ctx.beginPath(); | |
| ctx.rect(startX, startY, endX, endY); | |
| ctx.stroke(); | |
| } | |
| function clearCanvas(ctx, canvas) { | |
| ctx.clearRect(0, 0, canvas.width, canvas.height); | |
| } | |
| function mdfCuttingList(height, width) { | |
| const orientation = "portrait"; | |
| // styles are the 'rails' pieces of wood on the side | |
| const styles = '2 x 1800' | |
| const battens = '5 x 1164'; // lookup based on height | |
| } | |
| const wood = { | |
| height: 1800, | |
| width: 39, | |
| depth: 18, | |
| } | |
| </script> | |
| <style> | |
| canvas { | |
| border: 1px solid black; | |
| } | |
| #form { | |
| margin-top: 20px; | |
| } | |
| #submit-button { | |
| display: block; | |
| margin-top: 20px; | |
| } | |
| .input-container { | |
| margin-top: 10px; | |
| } | |
| </style> | |
| </head> | |
| <body onload="draw();"> | |
| <h1>Form</h1> | |
| <div id="form"> | |
| <div class="input-container"> | |
| <label for="height-input">Height:</label> | |
| <input type="text" name="height-input" id="height-input"/> | |
| </div> | |
| <div class="input-container"> | |
| <label for="width-input">Width:</label> | |
| <input type="text" name="width-input" id="width-input"/> | |
| </div> | |
| <div class="input-container"> | |
| <label for="depth-input">Depth:</label> | |
| <select name="depth-select" id="depth-select"> | |
| <option>30</option> | |
| <option>50</option> | |
| </select> | |
| </div> | |
| <div class="input-container"> | |
| <label for="height-select">Height:</label> | |
| <select name="height-select" id="height-select"> | |
| <option>300</option> | |
| <option>500</option> | |
| <option>600</option> | |
| <option>1200</option> | |
| <option>1500</option> | |
| <option>1800</option> | |
| <option>2100</option> | |
| <option>2400</option> | |
| </select> | |
| </div> | |
| <div class="input-container"> | |
| <textarea></textarea> | |
| </div> | |
| <button type="submit" onclick="draw();" id="submit-button">Draw</button> | |
| </div> | |
| <h1>Canvas</h1> | |
| <canvas id="canvas" width="1000" height="500"></canvas> | |
| </body> | |
| </html> |
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