Small graphical glitches

[robertosw]

I really like this crate, will use it in my project. Great work :D

While trying this out, I found two glitches. Maybe I configured something wrong. I also tried in my terminal, but the glitches are there too. The screenshot is from VS Code's terminal.

1. Each time the lines cross, the color of the top one bleeds into the bottom one
2. The end values of both lines are way above 0, but the diagram lines are drawn from the value until 0

Values for both lines; 659.29, 301.96, 417.01, 580.61, 659.73, 574.36, 450.49, 358.84, 1540.40, 591.36 508.98, 804.54, 848.70, 319.94, 1037.34, 415.30, 834.05, 538.52, 1463.05, 310.16

Code:

Chart::new(200, 100, 1.0, 10.0)
        .linecolorplot(&Shape::Lines(&line1), RGB8 { r: 255, g: 0, b: 0 })
        .linecolorplot(&Shape::Lines(&line2), RGB8 { r: 0, g: 255, b: 0 })
        .x_axis_style(LineStyle::None)
        .y_axis_style(LineStyle::None)
        .x_label_format(LabelFormat::Value)
        .y_label_format(LabelFormat::Value)
        .display();