iOS網膜ディスプレイ用にFlotを設定する方法

Question

私はこれをiPad（3世代）でテストしました。折れ線グラフは完全に滑らかに見えます。

http://justindarc.github.com/flot.touch/example/index.html

私は自分のFLOTコードとコードを差分の試してみましたが、それは網膜モードで実行させるような任意の有意な差を見ることができません。彼のコードと同じで、私のフロートはバージョン0.7です。何が私の自分のチャートを試しても網膜以外のモードで実行されます。

網膜モードを実行するトリックとは何ですか？

セットアップコードがかなり長いです。

私はこのようなjquery.flot.jsを変更した

function setup_chart0(setup_options) { 
    var point_data = []; 
    if(setup_options.use_sample_data_for_chart0) { 
     point_data = generate_dummy_data(
      setup_options.timestamp_generate_min, 
      setup_options.timestamp_generate_max 
     ); 
    } 
    var average_data = henderson23(point_data); 
    var datasets = make_chart0_datasets(point_data, average_data); 

    if(is_dualaxis_detail_mode) { 
     datasets = make_chart0_dual_datasets(
      [], 
      [], 
      [], 
      [] 
     ); 
    } 


    var options = default_plot_options(); 
    options.xaxis.min = setup_options.timestamp_visible_min; 
    options.xaxis.max = setup_options.timestamp_visible_max; 
    options.xaxis.panRange = [setup_options.timestamp_pan_min, setup_options.timestamp_pan_max]; 
    options.yaxis.min = -0.025; 
    options.yaxis.max = 1.025; 
    options.yaxis.panRange = [-0.025, 1.025]; 
    options.legend = { container: '#legend0', noColumns: 2 }; 
    options.grid.markings = compute_markings_with_alertlevels; 

    if(is_dualaxis_detail_mode) { 
     options.y2axis = {}; 
     options.y2axis.position = "right"; 
     options.y2axis.min = -0.025; 
     options.y2axis.max = 1.025; 
     options.y2axis.panRange = [-0.025, 1.025]; 
     options.legend = { container: '#legend_hidden', noColumns: 2 }; 
    } 

    //save_as_file({ samples: point_data, average: average_data }); 

    var el_placeholder0 = $("#placeholder0"); 
    if(el_placeholder0.length){ 
     //console.log('plotting chart 0'); 
     var fade = false; 
     var el = el_placeholder0; 
     var el_outer = $("#placeholder0_outer"); 
     var original_offset = el_outer.offset(); 
     if(fade) { 
      el_outer.offset({ top: -5000, left: 0 }); // move plot container off screen 
     } 
     chart0 = $.plot(el, datasets, options); 
     if(fade) { 
      el.hide(); // hide plot - must do *after* creation 
      el_outer.offset(original_offset); // put plot back where it belongs 
      el.fadeIn('slow'); // fade in 
     } 

     /*var s = ' width: ' + chart0.width() + ' height: ' + chart0.height(); 
     $('#label0').append(s);*/ 

     if(solo_pan_mode) { 
      el.bind('plotpan', function (event, plot) { 
       set_data_should_redraw_chart0 = true; 
       set_data_should_redraw_chart1 = false; 
       set_data_should_redraw_chart2 = false; 
       fetch_data_for_chart(chart0, setup_options.timestamp); 
       show_loading_empty('#loader1'); 
       show_loading_empty('#loader2'); 
      }); 
      el.bind('plotpanend', function (event, plot) { 
       set_data_should_redraw_chart0 = true; 
       set_data_should_redraw_chart1 = true; 
       set_data_should_redraw_chart2 = true; 
       copy_min_max(chart0, chart1, '#placeholder1'); 
       copy_min_max(chart0, chart2, '#placeholder2'); 
       hack_hide_loading_wheels = true; 
       maybe_hide_loading_wheels(); 
      }); 
     } else { 
      el.bind('plotpan', function (event, plot) { 
       fetch_data_for_chart(chart0, setup_options.timestamp); 
       sync_with_chart0(); 
      }); 
     } 

    } 
} 

Answer 1

：

トップでは、私は今、網膜では、これらの機能を利用できる

function makeCanvas(skipPositioning, cls) { 
    var c = document.createElement('canvas'); 
    c.className = cls; 
    c.width = canvasWidth; 
    c.height = canvasHeight; 

    if (!skipPositioning) 
     $(c).css({ position: 'absolute', left: 0, top: 0 }); 

    $(c).appendTo(placeholder); 

    if(retinaMode) { 
     c.width = canvasWidth * 2; 
     c.height = canvasHeight * 2; 
     c.style.width = '' + canvasWidth + 'px'; 
     c.style.height = '' + canvasHeight + 'px'; 
    } 

    if (!c.getContext) // excanvas hack 
     c = window.G_vmlCanvasManager.initElement(c); 

    // used for resetting in case we get replotted 
    c.getContext("2d").save(); 

    if (retinaMode) { 
     c.getContext("2d").scale(2,2); 
    } 

    return c; 
} 

function getCanvasDimensions() { 
    canvasWidth = placeholder.width(); 
    canvasHeight = placeholder.height(); 

    if (canvasWidth <= 0 || canvasHeight <= 0) 
     throw "Invalid dimensions for plot, width = " + canvasWidth + ", height = " + canvasHeight; 
} 

function resizeCanvas(c) { 
    // resizing should reset the state (excanvas seems to be 
    // buggy though) 
    if (c.width != canvasWidth) { 
     c.width = canvasWidth; 
     if(retinaMode) { 
      c.width = canvasWidth * 2; 
     } 
     c.style.width = '' + canvasWidth + 'px'; 

    } 

    if (c.height != canvasHeight) { 
     c.height = canvasHeight; 
     if(retinaMode) { 
      c.height = canvasHeight * 2; 
     } 
     c.style.height = '' + canvasHeight + 'px'; 
    } 

    // so try to get back to the initial state (even if it's 
    // gone now, this should be safe according to the spec) 
    var cctx = c.getContext("2d"); 
    cctx.restore(); 

    // and save again 
    cctx.save(); 

    if(retinaMode) { 
     cctx.scale(2, 2); 
    } 
}