ios - Draw on UIImageView over MKMapView -


i have searched lot answer question, none of them seem want. lot of tutorials show me how add lines , polygons in code, not freehand drawing.

i got mkmapview uiimageview on map. , can draw little on uiimageview right after that, mkmapview draged , draw doesn't continue.

i know have done wrong ?

here code touches events : 

- (void)touchesbegan:(nsset *)touches withevent:(uievent *)event {     uitouch *touch = [touches anyobject];     pointa = [touch locationinview:drawview]; }  - (void)touchesmoved:(nsset *)touches withevent:(uievent *)event {         uitouch *touch = [touches anyobject];         cgpoint currentlocation = [touch locationinview:drawview];          uigraphicsbeginimagecontext(drawview.frame.size);         cgcontextref ctx = uigraphicsgetcurrentcontext();         [drawview.image drawinrect:cgrectmake(0, 0, drawview.frame.size.width, drawview.frame.size.height)];         cgcontextsetlinecap(ctx, kcglinecapround);         cgcontextsetlinewidth(ctx, 5.0);         cgcontextsetrgbstrokecolor(ctx, 1.0, 0.0, 0.0, 1.0);         cgcontextbeginpath(ctx);         cgcontextmovetopoint(ctx, pointa.x, pointa.y);         cgcontextaddlinetopoint(ctx, currentlocation.x, currentlocation.y);         cgcontextstrokepath(ctx);         drawview.image = uigraphicsgetimagefromcurrentimagecontext();         uigraphicsendimagecontext();          pointa = currentlocation; }  - (void)touchesended:(nsset *)touches withevent:(uievent *)event {         uitouch *touch = [touches anyobject];         cgpoint currentlocation = [touch locationinview:drawview];          uigraphicsbeginimagecontext(drawview.frame.size);         cgcontextref ctx = uigraphicsgetcurrentcontext();         [drawview.image drawinrect:cgrectmake(0, 0, drawview.frame.size.width, drawview.frame.size.height)];         cgcontextsetlinecap(ctx, kcglinecapround);         cgcontextsetlinewidth(ctx, 5.0);         cgcontextsetrgbstrokecolor(ctx, 1.0, 0.0, 0.0, 1.0);         cgcontextbeginpath(ctx);         cgcontextmovetopoint(ctx, pointa.x, pointa.y);         cgcontextaddlinetopoint(ctx, currentlocation.x, currentlocation.y);         cgcontextstrokepath(ctx);         drawview.image = uigraphicsgetimagefromcurrentimagecontext();         uigraphicsendimagecontext();          pointa = currentlocation; }

and code of button show uiimageview :

edit : made stoping interactions map :

- (ibaction)modedraw:(id)sender {     if (drawview.alpha == 0.0) {         drawview.image=nil; //empty new draw         drawview.backgroundcolor = [uicolor whitecolor];         [uiimageview beginanimations:nil context:nil];         [uiimageview setanimationduration:0.5];         [drawview setalpha:0.4];         [uiimageview commitanimations];         mymapview.zoomenabled = no;         mymapview.scrollenabled = no;     } else {         [uiimageview beginanimations:nil context:nil];         [uiimageview setanimationduration:0.5];         [drawview setalpha:0.0];         [uiimageview commitanimations];         mymapview.zoomenabled = yes;         mymapview.scrollenabled = yes;     } }

after doing draw, i transform draw form (area), put on map. if have indications me ?

thank you, , sorry bad english.

here code if have same problem me , link allan gave me : http://www.apps168.net/post/1460.html :

- (void)touchesbegan:(nsset *)touches withevent:(uievent *)event {     uitouch *touch = [touches anyobject];     pointa = [touch locationinview:drawview];     pathref = cgpathcreatemutable();     cgpathmovetopoint(pathref, null, pointa.x, pointa.y); }  - (void)touchesmoved:(nsset *)touches withevent:(uievent *)event {     uitouch *touch = [touches anyobject];     cgpoint currentlocation = [touch locationinview:drawview];     cgpoint pastlocation = [touch previouslocationinview:drawview];      uigraphicsbeginimagecontext(drawview.frame.size);     cgcontextref ctx = uigraphicsgetcurrentcontext();     [drawview.image drawinrect:cgrectmake(0, 0, drawview.frame.size.width, drawview.frame.size.height)];     cgcontextsetlinecap(ctx, kcglinecapround);     cgcontextsetlinewidth(ctx, 5.0);     cgcontextsetrgbstrokecolor(ctx, 0.0, 0.0, 0.0, 1.0);     cgcontextbeginpath(ctx);     cgcontextstrokepath(ctx);      cgcontextmovetopoint(ctx, pastlocation.x, pastlocation.y);     cgcontextaddlinetopoint(ctx, currentlocation.x, currentlocation.y);     cgcontextdrawpath(ctx, kcgpathfillstroke);     drawview.image=uigraphicsgetimagefromcurrentimagecontext();      cgpathaddlinetopoint(pathref, null, currentlocation.x, currentlocation.y);     uigraphicsendimagecontext();      //pointa = currentlocation; }  - (void)touchesended:(nsset *)touches withevent:(uievent *)event {      cgpathclosesubpath(pathref);      nsuinteger count = [array count];     (nsuinteger = 0; < count; i=i+2) {         nsstring *lat = [array objectatindex: i];         nsstring *lgt = [array objectatindex: i+1];          cllocationcoordinate2d pointloc;         pointloc.latitude = [lat doublevalue];         pointloc.longitude = [lgt doublevalue];          locationconvertoimage = [mymapview convertcoordinate:pointloc topointtoview:drawview];         if (cgpathcontainspoint(pathref, null, locationconvertoimage, no)) {             nslog(@"point in path!");             //sélection de ces points et cacher les autres.         }     }      [uiimageview beginanimations:nil context:nil];     [uiimageview setanimationduration:0.5];     [drawview setalpha:0.0];     [uiimageview commitanimations];     mymapview.zoomenabled = yes;     mymapview.scrollenabled = yes;  }

Comments

Post a Comment

Popular posts from this blog

Why does Ruby on Rails generate add a blank line to the end of a file? -

running rails generate controller foo home results in: class foocontroller < application controller def home end end (there's nothing on line in actual file, blank line) is there purpose blank line? it's common use newline indicate end of line, last line. many editors (like vi, use) add in newline silently. consensus text files (especially in unix world) should end in newline, , there have been problems historically if wasn't present. why should text files end newline? the tool used count lines in file "wc" counts newlines in file, without trailing newline show 3 instead of 4. it improves readability of templates used in generator. consider: https://github.com/rails/rails/blob/master/railties/lib/rails/generators/rails/controller/templates/controller.rb to remove trailing newline, template have last line of: end<% end -%> instead of: end <% end -%> that seems less readable me. the discussion below refers ...
Read more

keyboard - Smiles and long press feature in Android -

i've created android keyboard. how add features inserting smilies, , using long keypresses display symbols? to create long-press behavior allows select several options pop-up menu, follow guide (specifically pop-up menu section): http://developer.android.com/guide/topics/ui/menus.html smileys (also known emoticons) combination of keys, understood programs , parsed same way. have do, when clicks smiley face on keyboard, simulate pressing of key combination matching emoticon. example, when clicks smiley, should simulate key presses ':' , ')' :). here's list of emoticons: http://en.wikipedia.org/wiki/list_of_emoticons
Read more

node.js - Bad Request - node js ajax post -

i'm using express 3.0 , node v0.11.0. have button submits form , i'm using ajax post data json object node server. client code is: $('#contact').submit(function(e) { console.log('submit called'); var formdata = json.stringify($('form').serializeobject()); console.log(formdata); $.ajax({ url: "http://localhost:3000/savedata/", type: "post", datatype: 'json', data: {objectdata: formdata}, contenttype: "application/json", complete: function() { console.log('process complete'); }, success: function(data) { console.log('process sucess'); }, error: function() { console.log('process error'); }, }); return false; }); then on server: var express = require('express'); var app = express(); app.set('views', __dirname + '/views'); app.set('view engine', 'jade'); app.use(express.bodyparser());...
Read more