ios - drawInRect: losing Quality of Image resolution -



ios - drawInRect: losing Quality of Image resolution -

i trying erase image using next code

cgcolorref strokecolor = [uicolor whitecolor].cgcolor; uigraphicsbeginimagecontext(imgforeground.frame.size); cgcontextref context = uigraphicsgetcurrentcontext(); [imgforeground.image drawinrect:cgrectmake(0, 0, imgforeground.frame.size.width, imgforeground.frame.size.height)]; cgcontextsetlinecap(context, kcglinecapround); cgcontextsetlinewidth(context, 10); cgcontextsetstrokecolorwithcolor(context, strokecolor); cgcontextsetblendmode(context, kcgblendmodeclear); cgcontextbeginpath(context); cgcontextmovetopoint(context, lastpoint.x, lastpoint.y); cgcontextaddlinetopoint(context, currentpoint.x, currentpoint.y); cgcontextstrokepath(context); imgforeground.image = uigraphicsgetimagefromcurrentimagecontext(); uigraphicsendimagecontext();

but find out image losing resolution due drawinrect.

you should go uigraphicsbeginimagecontextwithoptions instead of uigraphicsbeginimagecontext, scale factor can specified.

for example, utilize scale factor of device's main screen:

uigraphicsbeginimagecontextwithoptions(imgforeground.frame.size, no, 0);

ios cocoa-touch uiimage quartz-graphics cgcontext

Comments

Post a Comment

Popular posts from this blog

web services - java.lang.NoClassDefFoundError: Could not initialize class net.sf.cglib.proxy.Enhancer -

web services - java.lang.NoClassDefFoundError: Could not initialize class net.sf.cglib.proxy.Enhancer - when trying request rest service @ time of response getting exception.. feb 21, 2013 2:34:49 pm com.sun.jersey.spi.container.containerresponse mapmappablecontainerexception severe: exception contained within mappablecontainerexception not mapped response, re-throwing http container java.lang.noclassdeffounderror: not initialize class net.sf.cglib.proxy.enhancer @ org.hibernate.proxy.pojo.cglib.cgliblazyinitializer.getproxyfactory(cgliblazyinitializer.java:117) @ org.hibernate.proxy.pojo.cglib.cglibproxyfactory.postinstantiate(cglibproxyfactory.java:43) @ org.hibernate.tuple.entity.pojoentitytuplizer.buildproxyfactory(pojoentitytuplizer.java:162) @ org.hibernate.tuple.entity.abstractentitytuplizer.<init>(abstractentitytuplizer.java:135) @ org.hibernate.tuple.entity.pojoentitytuplizer.<init>(pojoentitytuplizer.java:55) @ org.hibernate.tuple.e...
Read more

Accessing MATLAB's unicode strings from C -

Accessing MATLAB's unicode strings from C - how can access underlying unicode info of matlab strings through matlab engine or mex c interfaces? here's example. let's set unicode characters in utf-8 encoded file test.txt, read as fid=fopen('test.txt','r','l','utf-8'); s=fscanf(fid, '%s') in matlab. now if first feature('defaultcharacterset', 'utf-8') , c engevalstring(ep, "s") , output text file utf-8. proves matlab stores unicode internally. if mxarraytostring(enggetvariable(ep, "s")) , unicode2native(s, 'latin-1') give me in matlab: non-latin-1 characters replaced character code 26. need getting access underlying unicode info c string in unicode format (utf-8, utf-16, etc.), , preserving non-latin-1 characters. is possible? my platform os x, matlab r2012b. addendum: documentation explicitly states "[mxarraytostring()] supports multibyte encoded characters...
Read more

javascript - mongodb won't find my schema method in nested container -

javascript - mongodb won't find my schema method in nested container - i trying access method of schema stored within mixed container. here situation : have cases model can many different things, have schema each of these things stored in "casecontent" mixed property. var caseschema = mongoose.schema({ casecontent : {}, object : {type:string, default : "null"}, collision : {type : boolean, default : false} }); the casecontent property filled model of 1 of schemas, 1 exemple : var treeschema = new mongoose.schema({ applecount : {type : number, default : 3} }); treeschema.methods.dostuff = function (data) { console.log('hey, listen'); homecoming true; }; then, want utilize method of schema original container : caseschema.methods.dostuff = function (data) { if (this.casecontent.dostuff !== undefined) { this.casecontent.dostuff(); console.log('it worked'); } else { ...
Read more