[英]Draw vertical lines at regular intervals in rectangle using Fabric.js
我想以規則的間隔在矩形中繪制垂直線,並且線的數量取決於用戶。
如果數字為3,則應該在矩形中存在相等間隔的垂直線。 我如何在Fabric.js中實現這一目標
我可以使用鼠標事件繪制矩形。
代碼和小提琴如下:
//Start when the document is loaded
$(document).ready(function(){
var canDraw = true;
//Getting the canvas
var canvas1= new fabric.Canvas('canvas');
//Setting the canvas properties
canvas1.setHeight(400);
canvas1.setWidth(1300);
canvas1.renderAll();
//End of canvas1
//Binding the functions to button_2
$('#2').click(function(){
console.log("Button 2 cilcked");
canvas1.isDrawingMode=false;
//Declaring the variables
var isMouseDown=false;
var OriginX=new Array();
var OriginY= new Array();
var refRect;
if( canDraw ) {
//Setting the mouse events
canvas1.on('mouse:down',function(event){
//Defining the procedure
isMouseDown=true;
OriginX=[];
OriginY=[];
//Getting the mouse Co-ordinates
var posX=event.e.clientX;
var posY=event.e.clientY;
OriginX.push(posX);
OriginY.push(posY);
//Creating the rectangle object
var rect=new fabric.Rect({
left:OriginX[0],
top:OriginY[0],
width:0,
height:0,
stroke:'red',
fill:'white'
});
canvas1.add(rect);
rect.lockRotation=true;
refRect=rect; //**Reference of rectangle object
});
}
canvas1.on('mouse:move', function(event){
// Defining the procedure
if(canDraw) {
//Getting the mouse Co-ordinates
var posX=event.e.clientX;
var posY=event.e.clientY;
refRect.setWidth(Math.abs((posX-refRect.get('left'))));
refRect.setHeight(Math.abs((posY-refRect.get('top'))));
refRect.setCoords();
canvas1.renderAll();
}
});
canvas1.on('mouse:up',function(){
canDraw = false;
});
});
});
小提琴:
如果在間隔中使用以下代碼,並將變量“ size”設置為width /(所需的行數),則應獲得所需的結果
var canvas = new fabric.Canvas('canvas');
window.onload=function(){
var width = canvas.width;//you may specify the rectangle width in your case
var height = canvas.height;//you may specify the rectangle height in your case
var j = 0;
var line = null;
var rect = [];
var size = 800/3;
//divide the rectangles width with the number of lines required in this case the assuming the canvas is the rectangle and the requirement of 3 verticle lines
for (var i = 0; i < Math.ceil(width/20); ++i) {
rect[0] = i * size;
rect[1] = 0;
rect[2] = i * size;
rect[3] = height;
line = null;
line = new fabric.Line(rect, {
stroke: '#ff001e'
});
line.selectable = false;
canvas.add(line);
line.sendToBack();
}
canvas.renderAll();
}
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