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July 23, 2023 06:53
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Simplest HTML5 drawing tool
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| <html> | |
| <style> | |
| body { | |
| margin: 0; | |
| padding 0; | |
| } | |
| </style> | |
| <body> | |
| <script> | |
| var canvas, context, mouse = { x: 0, y: 0 }; | |
| init(); | |
| function init() { | |
| canvas = document.createElement( 'canvas' ); | |
| canvas.width = window.innerWidth; | |
| canvas.height = window.innerHeight; | |
| canvas.style.cursor = 'crosshair'; | |
| context = canvas.getContext( '2d' ); | |
| context.strokeStyle = 'rgb(0,0,0)'; | |
| context.lineWidth = 0.5; | |
| document.addEventListener( 'mousedown', onDocumentMouseDown, false ); | |
| document.addEventListener( 'mouseup', onDocumentMouseUp, false ); | |
| document.body.appendChild( canvas ); | |
| } | |
| function onDocumentMouseDown( event ) { | |
| mouse.x = event.clientX; | |
| mouse.y = event.clientY; | |
| document.addEventListener( 'mousemove', onDocumentMouseMove, false ); | |
| } | |
| function onDocumentMouseUp( event ) { | |
| document.removeEventListener( 'mousemove', onDocumentMouseMove, false ); | |
| } | |
| function onDocumentMouseMove( event ) { | |
| context.beginPath(); | |
| context.moveTo( mouse.x, mouse.y ); | |
| context.lineTo( event.clientX, event.clientY ); | |
| context.stroke(); | |
| mouse.x = event.clientX; | |
| mouse.y = event.clientY; | |
| } | |
| </script> | |
| </body> | |
| </html> |
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