javascript - Canvas signature on scroll changes mouse draw location -


I am trying to use canvas so that someone with a mouse can write their signature until I see the screen By stretching or scrolling, everything works until it pulls the line at a different place than the mouse.

code: 

  function onMouseUp (event) {'strict experiment'; Mouse pressed = false; } Ceremony onMouseMove (event) {'strict experiment'; If (mouse button) {event.preventDefault (); Mousex = event. Client X - can.offsetLeft - mleft; MouseY = event.clientY - can.offsetTop - mtop; Ctx.lineTo (mousex, mousse); ctx.stroke (); }} Function onMouseDown (event) {'use strict'; MousePressed = True; Mousex = event. Client X - can.offsetLeft - mleft; MouseY = event.clientY - can.offsetTop - mtop; Ctx.beginPath (); Ctx.moveTo (mousex, mousse); } Can.addEventListener ('mousemove', onMouseMove, incorrect); Can.addEventListener ('mousedown', onMouseDown, False); Can.addEventListener ('mouseup', onMouseUp, Incorrect);   
 looks like HTML:  & lt; Canvas id = "signature" width = "567" height = "150" & gt; & Lt; / Canvas & gt;    
 
 
  event.clientX / y  top left corner of viewport Therefore the scroll has not been kept in mind. Relates to the  event.pageX / y  document. So this is the situation on the screen that the event has occurred with scroll. You can change all the references from  clientX  to  pageX  and  clientY  in  pageY  and it should work.

Comments

Post a Comment

Popular posts from this blog

jasper reports - How to center align barcode using jasperreports and barcode4j -

I use iReport 5.5.0 . How to align a barcode component to the center The relevant piece of my jrxml is below & Lt; JR: Code 128 xmlns: JR = "http://jasperreports.sourceforge.net/jasperreports/components" xsi: schemaLocation = "http://jasperreports.sourceforge.net/jasperreports/components http: //jasperreports.sourceforge Purge / xsd / components.xsd "textPosition =" bottom "& gt; & Lt; Jr: codeExpression & gt; & Lt; [CDATA [$ F {number}]] & gt; & Lt; / Jr: codeExpression & gt; & Lt; / Jr: Code 128 & gt; & Lt; / componentElement & gt; "Text" itemprop = "text"> Create a style after this, it is called "barcode", like: & lt; Style name = "barcode" fontName = "Helvetica" fONTSIZE = "10" hAlign = "center" valign = "center" /> and set the property of your barcode element to "barcode".
Read more

Verilog Error: output or inout port "Q" must be connected to a structural net expression -

I get the error every time, I try to compile. I'm not sure why anyone can help is? I'm new to verilog. Module D_FF (clerk, d, reset_n, q); Input D, Clack, reset_en; Output Q; reg Q; lab4_gdl f1 (.lk (~ clk), d (d), .q.m (qm)); lab4_GDL f2 (.Clk (Clk), D (QM), .Q (Q)); Always start at @ (posedge clk, neggeous reset_n) (Reset_n == 0) Q & lt; = 0; Other questions & lt; = D; Edit End: The problem is what we are asking to do: In this section, you apply the memory / registration circuit on the AlterEdie 2 board. will do. The circuit has the following specifications: The present value of swift SW15-0 on the D2 board should be shown in four hexadecimal four sections of HEX3-0. This part of the circuit will be combination logic. To use an active-less asynchronous reset and KEY1 to use KEY0 as the clock input, you must store SW15-0in in a 16-bit register in the value The register should be enabled to have a 16-bit positive edge, which uses the embedded D flip-flo
Read more

c# - ASP.NET MVC - Attaching an entity of type 'MODELNAME' failed because another entity of the same type already has the same primary key value -

In brief, the wrapper module is inserted during posting and the status of an entry is changed to 'modified' . Before changing the state, the state is set to 'separate', but calling attachments () causes the same error to be thrown away. I am using EF 6. Model / wrapper class public class avi model {public A is a {get; Set; } Public listing & lt; B & gt; B {received; Set; } Public cc {receipt; Set; }} Administrator edit public functioning (int? id) {if (id == null) {new HttpStatusCodeResult (HttpStatusCode.BadRequest); } If (! Conveyor Access (id.Value)) new HTTPTitus code result (HTTP status code. Forbidden); Var aViewModel = new AViewModel (); aViewModel.A = db.As.Find (id); If (aViewModel.Receipt == zero) {return HttpNotFound (); } aViewModel.b = db.Bs.Where (x => x.aid == id.Value) .Oolist (); AViewModel.Vendor = db.Cs.Where (x => x.cid == aViewModel.a.cID) .FirstOrDefault (); See Return (aViewModel); } [HTPFost] [Valid AntitiferousTeacon
Read more