bar chart - iPad: How can I create a dynamic barchart using CGAffineTransformScale? -

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i trying create animated barchart scaling bar (slider) , translating endcap. endcap works expected, however, "slider" translates when try scale horizontally.

-(void) animatebaropen: (nsinteger) rowindex {     nslog(@"%s: row=%d %@", __function__, rowindex, [self.values objectatindex:rowindex]);     nsmutabledictionary *row = [self.values objectatindex:rowindex];     uiimageview *slider = [row objectforkey:@"slider"];     uiimageview *endcap = [row objectforkey:@"image"];     uilabel *labelinfo = [row objectforkey:@"label"];     [labelinfo settext: [nsstring stringwithformat: @"%@ %@", [row objectforkey:@"quantity"], [row objectforkey:@"color"]]];     [labelinfo settextcolor: productcolor];      float quantity = [(nsnumber*) [row objectforkey:@"quantity"] floatvalue];     float tx = 10.0f * quantity;     float sx = -40.0f * quantity;      [uiview beginanimations:@"open" context:nil];     [uiview setanimationduration:0.25];     [uiview setanimationdelay:0.0];     [uiview setanimationcurve:uiviewanimationcurveeaseinout];      slider.transform = cgaffinetransformscale(cgaffinetransformidentity, sx, 1.0f);      endcap.transform = cgaffinetransformtranslate(cgaffinetransformidentity, tx, 0.0f);     labelinfo.transform = cgaffinetransformtranslate(cgaffinetransformidentity, tx, 0.0f);      [uiview commitanimations]; }

ok - found ref explaining issue allowed me fix code. basically, since scaling based upon view's center property, therefore translates origin. result, have (re-)translate view location expected translate ratio of translation distance of location scaling moved.

demystifying cgaffinetransform

below code (that works) , notice computation of ratio of width before-to-after , translating amount. @ computation sx , second computation of tx (after animation). thought both should go in animation, not work might expect if second translation inside begin/commit.

also note: left of cosmetic code displaying colorful caption @ tip of bar.

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(void) animatebaropen: (nsinteger) rowindex withduration: (nstimeinterval) duration {     if (verbose_log) {         nslog(@"%s: row=%d %@", __function__, rowindex, [self.values objectatindex:rowindex]);     }      nsmutabledictionary *rowvalues = [self.values objectatindex:rowindex];     nsmutabledictionary *rowoutlets = [self.iboutlets objectatindex:rowindex];     uicolor *productcolor = [infographview colorbyname: [rowvalues objectforkey: @"color"]];     uiimageview *slider = [rowoutlets objectforkey:@"slider"];     uiimageview *endcap = [rowoutlets objectforkey:@"image"];     uilabel *labelinfo = [rowoutlets objectforkey:@"label"];     nsassert1(labelinfo != nil, @"labelinfo null??", nil);     [labelinfo setbackgroundcolor: productcolor];     // (255, 253, 208)     uicolor *creamcolor = [uicolor colorwithred:255.0/255.0f green:253.0/255.0f blue:208.0/255.0f alpha:0.9];     [labelinfo settextcolor: creamcolor];     if ([(nsstring*)[rowvalues objectforkey:@"color"] isequaltostring:@"black"]) {         [labelinfo setshadowcolor: [uicolor graycolor]];     } else {         [labelinfo setshadowcolor: [uicolor blackcolor]];     }     [labelinfo settext: [nsstring stringwithformat: @"%@ %@", [rowvalues objectforkey:@"quantity"], [rowvalues objectforkey:@"color"]]];      [slider sethidden:yes];     [slider setalpha: 0.7f];      float rangescale = [self computerangescale: self.values forwidth: cgrectgetwidth(self.frame) - margins];      slider.transform = cgaffinetransformidentity;      float quantity = [(nsnumber*) [rowvalues objectforkey:@"quantity"] floatvalue];     float tx = rangescale * quantity;     float sx = tx / cgrectgetwidth(slider.frame); // (cgrectgetwidth(endcap.frame) - cgrectgetwidth(slider.frame));      float sliderwidth = cgrectgetwidth(slider.frame);      [slider sethidden:(rowindex == -1)];      [uiview beginanimations:@"open" context:nil];     [uiview setanimationduration:duration];     [uiview setanimationcurve:uiviewanimationcurveeaseinout];      slider.transform = cgaffinetransformscale(cgaffinetransformidentity, sx, 1.0f);     endcap.transform = cgaffinetransformtranslate(cgaffinetransformidentity, tx, 0.0f);     labelinfo.transform = cgaffinetransformtranslate(cgaffinetransformidentity, tx, (-rowindex*1.0f));     [labelinfo setalpha:1.0];      [uiview commitanimations];      tx = 1.0f * (cgrectgetwidth(slider.frame) - sliderwidth) / (sx*2.0f);      slider.transform = cgaffinetransformtranslate(slider.transform, tx, 0.0f);     [slider sethidden:no];  }

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