i have drawing app use preexisting .png images draw textured colors uiimageview.
//basic drawing stuff
- (void)touchesbegan:(nsset *)touches withevent:(uievent *)event { ctr = 0; pts[0] = [touch locationinview:self.tempimage]; lastpoint = [touch locationinview:tempimage]; } - (void)touchesmoved:(nsset *)touches withevent:(uievent *)event { uitouch *touch = [touches anyobject]; cgpoint p = [touch locationinview:self.tempimage]; currentpoint = [touch locationinview:tempimage]; ctr++; pts[ctr] = p; if (ctr == 4) { pts[3] = cgpointmake((pts[2].x + pts[4].x)/2.0, (pts[2].y + pts[4].y)/2.0); // move endpoint middle of line joining second control point of first bezier segment , first control point of second bezier segment [path movetopoint:pts[0]]; [path addcurvetopoint:pts[3] controlpoint1:pts[1] controlpoint2:pts[2]]; // add cubic bezier pt[0] pt[3], control points pt[1] , pt[2] [self draw2]; pts[1] = pts[4]; ctr = 1; } lastpoint = currentpoint; } - (void)touchesended:(nsset *)touches withevent:(uievent *)event { [path removeallpoints]; ctr = 0; uigraphicsbeginimagecontext(self.tempimage.frame.size); [self.imagesview.image drawinrect:cgrectmake(0,0, self.imagesview.frame.size.width, self.imagesview.frame.size.height) blendmode:kcgblendmodenormal alpha:1.0]; [self.tempimage.image drawinrect:cgrectmake(0,0, self.tempimage.frame.size.width, self.tempimage.frame.size.height) blendmode:kcgblendmodenormal alpha:a]; self.imagesview.image = uigraphicsgetimagefromcurrentimagecontext(); self.tempimage.image = nil; uigraphicsendimagecontext(); } - (void)draw2 { uigraphicsbeginimagecontext(self.tempimage.frame.size); [self.tempimage.image drawinrect:cgrectmake(0, 0, self.tempimage.frame.size.width, self.tempimage.frame.size.height)]; if ([pencilstring isequaltostring:@"red"]) { //i assign preexisting .png (redtextureimage.png) colorwithpatternimage , draw it
brushimage = [uiimage imagenamed:@"redtextureimage.png]; [[uicolor colorwithpatternimage:brushimage]setstroke]; } cgcontextsetblendmode(uigraphicsgetcurrentcontext(),kcgblendmodenormal); [path stroke]; } //and sets alpha
self.tempimage setalpha:a]; uigraphicsendimagecontext(); } so can draw stroke or line across tempview when touchesmoved
and have saved onto imagesview on touchesend @ whatever alpha choose.
problem
what want take imagesview.image , save png image , load colorwithpatternimage, changing alpha @ will. can draw line across original drawing more transparent , change alpha , have different line of different transparency.
how save uiimageview.image .png image used colorpatternimage?
i have image illustrate can't see how upload it.
so figured out:
in touchesbegan made brushimage = self.imagesview.image;
then in touchesmoved used code erase stroke form imagesview , (draw2) redraw using colorwithpatterncolor brushimage instead of using blendmodenormal used blendmodecopy.
and works way want.
