`Gradient blending in ChartJS`

Currently, I am facing an issue with my line chart having 2 datasets filled with gradients that overlap, causing a significant color change in the 'bottom' dataset.

Check out my Codepen for reference: https://codepen.io/SimeriaIonut/pen/ydjdLz

Here are my gradient setups and their positions:

var gradientFillPlanned = ctx.createLinearGradient(250.000, 0.000, 150.000, 500.000);
gradientFillPlanned.addColorStop(0, "rgba(128, 182, 244, 0.6)");
gradientFillPlanned.addColorStop(1, "rgba(128, 182, 244, 0.0)");

var gradientFillActual = ctx.createLinearGradient(250.000, 0.000, 150.000, 500.000);
gradientFillActual.addColorStop(0, "rgba(244, 144, 128, 0.6)");
gradientFillActual.addColorStop(1, "rgba(244, 144, 128, 0.0)");

I'm looking for a solution to only display the 'top' dataset until the starting point of the bottom one. Is there a way to achieve this using CSS masks or any other technique?

Thank you!

javascriptcsschart.js

Answer №1

The reason for this issue lies in the use of transparency values like 0.6 within the rgba function. You can experiment with different values to see the impact.

var gradientFillCustom = ctx.createLinearGradient(200.0, 100.0, 300.0, 400.0);
gradientFillCustom.addColorStop(0, "rgba(120,230,140, 1)");
gradientFillCustom.addColorStop(1, "rgba(200,200,200, 1)");

Check out this CodePen example

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