I saw this project from instructables.com and it seems like the code doesn't work as expected so I optimized it.

1. Change step type from MICROSTEP to INTERLEAVE for better toque.

    char STEP = INTERLEAVE

2. Change data type to long because Int couldn't handle it.

    x1 = (long)(x1*StepsPerMillimeterX);
    y1 = (long)(y1*StepsPerMillimeterY);

3. Reset pen settings to this

    float StepInc = 1;
    int StepDelay = 1;
    int LineDelay = 0;
    int penDelay = 40;

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