}

/* Test to draw a line*/

void testLine(){

// 0x00FF is the color data in the format of RGB565

uint16_t color = 0x00FF;

screen.fillScreen(COLOR_RGB565_BLACK);

for (int16_t x=0; x < screen.width(); x+=6) {

/*

* @ brief draw a line

* @ param x0 The x-coordinate of the first vertex

*

y0 The y-coordinate of the first vertex

*

x1 The x-coordinate of the second vertex

*

y1 The y-coordinate of the second vertex

*

c line color

*/

screen.drawLine(/*x0=*/screen.width()/*Screen width*//2, /*y0=*/screen.height()/*Screen height*//2, /*x1=*/x, /*y1=*/0, /*c=*/colo

}

for (int16_t y=0; y < screen.height(); y+=6) {

screen.drawLine(screen.width()/2, screen.height()/2, screen.width(), y, color+=0x0700);

}

for (int16_t x = screen.width(); x >= 0; x-=6) {

screen.drawLine(screen.width()/2, screen.height()/2, x,screen.height(), color+=0x0700);

}

for (int16_t y = screen.height(); y >= 0; y-=6) {

screen.drawLine(screen.width()/2, screen.height()/2, 0, y, color+=0x0700);

}

}

/* Test to fast draw line(need to set delay), only horizontal line and vertical line */

void testFastLines(uint16_t color1, uint16_t color2) {

for (int16_t y=0; y < screen.height(); y+=4) {

/*

* @ brief draw a line

* @ param x The x-coordinate of the first vertex

*

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