objective c - Objecive-C Draw a Circle with a Ring shape -

-

i wrote class draws animated progress circle (it draws circular sector based on float progress)

@implementation mxmprogressview  @synthesize progress;  - (id)initwithdefaultsize {     int circleoffset = 45.0f;     self = [super initwithframe:cgrectmake(0.0f,                                            0.0f,                                            135.0f + circleoffset,                                            135.0f + circleoffset)];     self.backgroundcolor = [uicolor clearcolor];     return self; }  - (void)drawrect:(cgrect)rect {      cgrect allrect = self.bounds;     cgrect circlerect = cgrectmake(allrect.origin.x + 2, allrect.origin.y + 2, allrect.size.width - 4,                                    allrect.size.height - 4);      cgcontextref context = uigraphicsgetcurrentcontext();      // background image     //uiimage *image = [uiimage imagenamed:@"loader_disc_hover.png"];      //[image drawinrect:circlerect];      // orange: e27006     cgcontextsetrgbfillcolor(context,                               ((cgfloat)0xe2/(cgfloat)0xff),                              ((cgfloat)0x70/(cgfloat)0xff),                              ((cgfloat)0x06/(cgfloat)0xff),                              0.01f); // fill      //cgcontextsetlinewidth(context, 2.0);     cgcontextfillellipseinrect(context, circlerect);     //cgcontextstrokeellipseinrect(context, circlerect);      // draw progress     float x = (allrect.size.width / 2);     float y = (allrect.size.height / 2);      // orange: e27006     cgcontextsetrgbfillcolor(context,                               ((cgfloat)0xe2/(cgfloat)0xff),                              ((cgfloat)0x70/(cgfloat)0xff),                              ((cgfloat)0x06/(cgfloat)0xff),                              1.0f); // progress      cgcontextmovetopoint(context, x, y);     cgcontextaddarc(context, x, y, (allrect.size.width - 4) / 2, -m_pi_2, (self.progress * 2 * m_pi) - m_pi_2, 0);     cgcontextclosepath(context);     cgcontextfillpath(context); }  @end

now want draw ring shape same progress animation, instead of filling full circle, circular sector again not starting center of circle.

i tried cgcontextaddellipseinrect , cgcontexteofillpath(context);

with no success.

i think you'll need construct more complex path, like:

// move start point of outer arc  (which might not required) cgcontextmovetopoint(context, x+outerradius*cos(startangle), y+outerradius*sin(startangle)); // add outer arc path (counterclockwise) cgcontextaddarc(context, x, y, outerradius, startangle, endangle, 0); // move *inward* start point of inner arc cgcontextmovetopoint(context, x+innerradius*cos(endangle), y+innerradius*sin(endangle)); // add inner arc path (clockwise) cgcontextaddarc(context, x, y, innerradius, endangle, startangle, 1); // close path end of inner arc start of outer arc cgcontextclosepath(context);

note: haven't tried above code myself


Comments

Post a Comment

Popular posts from this blog

c# - SVN Error : "svnadmin: E205000: Too many arguments" -

-
i trying reposotries using c# code process svncommand = null; var psi = new processstartinfo("svnadmin"); psi.redirectstandardoutput = true; psi.redirectstandarderror = true; psi.useshellexecute = false; psi.arguments= @"dump c:\repositories\myrepo > c:\temp\myrepodumpfile.dump"; using (svncommand = process.start(psi)) { var myoutput = svncommand.standardoutput; var myerror = svncommand.standarderror; debug.write("output :" + environment.newline + environment.newline + myoutput.readtoend() + environment.newline + "error :" + environment.newline + environment.newline + myerror.readtoend()); svncommand.close(); } when use dump command commandline svnadmin dump c:\repositories\myrepo > c:\temp\myrepodumpfile.dump it works fine when try ...
Read more

c# - Copy ObservableCollection to another ObservableCollection -

-
how copy observablecollection item observablecollection without reference of first collection? here observablecollection item value changes affecting both collections. code private observablecollection<ratemodel> _allmetalrate = new observablecollection<ratemodel>(); private observablecollection<ratemodel> _metalrateondate = new observablecollection<ratemodel>(); public observablecollection<ratemodel> allmetalrate { { return this._allmetalrate; } set { this._allmetalrate = value; notifypropertychanged("metalrate"); } } public observablecollection<ratemodel> metalrateondate { { return this._metalrateondate; } set { this._metalrateondate = value; notifypropertychanged("metalrateondate"); } } foreach (var item in metalrateondate) allmetalrate.add(item); what causing , how can solve it? you need clone object referenced item before it's a...
Read more

All overlapping substrings matching a java regex -

-
is there api method returns (possibly overlapping) substrings match regular expression? for example, have text string: string t = 04/31 412-555-1235; , , have pattern: pattern p = new pattern("\\d\\d+"); matches strings of 2 or more characters. the matches are: 04, 31, 412, 555, 1235. how overlapping matches? i want code return: 04, 31, 41, 412, 12, 55, 555, 55, 12, 123, 1235, 23, 235, 35. theoretically should possible -- there obvious o(n^2) algorithm enumerates , checks substrings against pattern. edit rather enumerating substrings, safer use region(int start, int end) method in matcher . checking pattern against separate, extracted substring might change result of match (e.g. if there non-capturing group or word boundary check @ start/end of pattern). edit 2 actually, it's unclear whether region() expect zero-width matches. specification vague, , experiments yield disappointing results. for example: string line = "xx90xx"; strin...
Read more