alpha value upgradation

RishikeshB commented 1 year ago

Hi, Thank you @kurkle for this great library! As in issue #93 I'd like to increase chart color intensity for better visualization. For this added 'alpha' value where set alpha value to 1 (alpha:1) the intensity of the chart flow color increases or else by default the color value will be 0.5. This will be helpful when given only two color for large dataset.

Eg: I'm not given alpha value and not given any color for flow, chart takes its default color values has red and green : code:

data: {
datasets: [{
label: 'My sankey',
data,
}]
},

chart looks like:

Eg: I'm given alpha value as 1 and not given any color for flow, chart takes its default color values has red and green: code:

data: {
datasets: [{
label: 'My sankey',
data,
alpha:1
}]
},

chart looks like

I'm submitting a PR that proposes a new option.

stockiNail commented 1 year ago

@RishikeshB @kurkle if I may jump in the thread, maybe the best thing is to remove any default alpha color value and delegate the user to decide the colors to apply. Just thinking loud.