fabricjs

问题 I have a fabricjs canvas that I need to input a PDF, similar to how images are loaded. I expect that I'd need to convert the PDF to a PNG via PDFjs before loading onto canvas? document.getElementById('imgLoader').onchange = function handleImage(e) { var reader = new FileReader(); reader.onload = function (event) { console.log('fdsf'); var imgObj = new Image(); imgObj.src = event.target.result; imgObj.onload = function () { var image = new fabric.Image(imgObj); image.set({ left: 320, top: 5, }

问题 Fiddle - jsfiddle sequencing: draw the line at coordinates (x1 = 50, y1 = 50, x2 = 450, y2 = 50) Checking coordinate y1. y1 = 50 Move the line on the y-axis by 50 pixels. Checking coordinate y1. LEFT y1 = 50 ??? Why is that? And how to get the true coordinates? var canvas = new fabric.Canvas('c'); var line = new fabric.Line([50, 50, 450, 50], { stroke: 'blue', strokeWidth : 10, hasControls: false, hasBorders: false, lockMovementX: true, lockMovementY: true, hoverCursor: 'default' }); canvas

问题 Fiddle - jsfiddle sequencing: draw the line at coordinates (x1 = 50, y1 = 50, x2 = 450, y2 = 50) Checking coordinate y1. y1 = 50 Move the line on the y-axis by 50 pixels. Checking coordinate y1. LEFT y1 = 50 ??? Why is that? And how to get the true coordinates? var canvas = new fabric.Canvas('c'); var line = new fabric.Line([50, 50, 450, 50], { stroke: 'blue', strokeWidth : 10, hasControls: false, hasBorders: false, lockMovementX: true, lockMovementY: true, hoverCursor: 'default' }); canvas

问题 Fiddle - jsfiddle sequencing: draw the line at coordinates (x1 = 50, y1 = 50, x2 = 450, y2 = 50) Checking coordinate y1. y1 = 50 Move the line on the y-axis by 50 pixels. Checking coordinate y1. LEFT y1 = 50 ??? Why is that? And how to get the true coordinates? var canvas = new fabric.Canvas('c'); var line = new fabric.Line([50, 50, 450, 50], { stroke: 'blue', strokeWidth : 10, hasControls: false, hasBorders: false, lockMovementX: true, lockMovementY: true, hoverCursor: 'default' }); canvas

问题 Fiddle - jsfiddle sequencing: draw the line at coordinates (x1 = 50, y1 = 50, x2 = 450, y2 = 50) Checking coordinate y1. y1 = 50 Move the line on the y-axis by 50 pixels. Checking coordinate y1. LEFT y1 = 50 ??? Why is that? And how to get the true coordinates? var canvas = new fabric.Canvas('c'); var line = new fabric.Line([50, 50, 450, 50], { stroke: 'blue', strokeWidth : 10, hasControls: false, hasBorders: false, lockMovementX: true, lockMovementY: true, hoverCursor: 'default' }); canvas

问题 Fiddle - jsfiddle sequencing: draw the line at coordinates (x1 = 50, y1 = 50, x2 = 450, y2 = 50) Checking coordinate y1. y1 = 50 Move the line on the y-axis by 50 pixels. Checking coordinate y1. LEFT y1 = 50 ??? Why is that? And how to get the true coordinates? var canvas = new fabric.Canvas('c'); var line = new fabric.Line([50, 50, 450, 50], { stroke: 'blue', strokeWidth : 10, hasControls: false, hasBorders: false, lockMovementX: true, lockMovementY: true, hoverCursor: 'default' }); canvas

问题 Fiddle - jsfiddle sequencing: draw the line at coordinates (x1 = 50, y1 = 50, x2 = 450, y2 = 50) Checking coordinate y1. y1 = 50 Move the line on the y-axis by 50 pixels. Checking coordinate y1. LEFT y1 = 50 ??? Why is that? And how to get the true coordinates? var canvas = new fabric.Canvas('c'); var line = new fabric.Line([50, 50, 450, 50], { stroke: 'blue', strokeWidth : 10, hasControls: false, hasBorders: false, lockMovementX: true, lockMovementY: true, hoverCursor: 'default' }); canvas

来源： https://stackoverflow.com/questions/52697422/how-to-get-top-left-of-an-object-inside-group-fabricjs

来源： https://stackoverflow.com/questions/44416109/canvas-client-size-in-fabric-js

来源： https://stackoverflow.com/questions/44416109/canvas-client-size-in-fabric-js