// The '(x != 0 && y != 0)' test in the last line of this function
// may be omitted for a performance benefit if the radius of the
// circle is known to be non-zero.
static void plot4points(uint16_t cx, uint16_t cy, uint16_t x, uint16_t y,
uint32_t color)
{
fgui_set_pixel(cx + x, cy + y, color);
if (x != 0) fgui_set_pixel(cx - x, cy + y, color);
if (y != 0) fgui_set_pixel(cx + x, cy - y, color);
if (x != 0 && y != 0) fgui_set_pixel(cx - x, cy - y, color);
}
/**
* Bresenham's line algorithm:
* http://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm
*/
void fgui_draw_line(uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1,
uint32_t color)
{
int16_t dx, dy, sx, sy, err, e2;
dx = abs(x1 - x0);
dy = abs(y1 - y0);
sx = x0 < x1 ? 1 : -1;
sy = y0 < y1 ? 1 : -1;
err = dx - dy;
while (1) {
fgui_set_pixel(x0, y0, color);
if (x0 == x1 && y0 == y1) {
break;
}
e2 = 2 * err;
if (e2 > -dy) {
err = err - dy;
x0 = x0 + sx;
}
if (e2 < dx) {
err = err + dx;
y0 = y0 + sy;
}
}
}
void fgui_fill_rectangle(uint16_t x, uint16_t y, uint16_t w, uint16_t h,
uint32_t color)
{
uint16_t xpos, ypos;
for (ypos = y; ypos < y + h; ypos++) {
for (xpos = x; xpos < x + w; xpos++) {
fgui_set_pixel(xpos, ypos, color);
}
}
}
void fgui_combobox_draw(struct fgui_widget *widget)
{
size_t i;
struct fgui_combobox *combobox = (struct fgui_combobox *)widget;
int n = 1;
int h = combobox->base.area.h*n;
int x1 = combobox->base.area.x+2;
int y1 = combobox->base.area.y;
int x2 = x1+combobox->base.area.w-5;
int y2 = y1+h-1;
if (!combobox->base.has_focus && !fgui_combobox_type) { // Cheap hack
combobox->is_expanded = false;
} else if (combobox->is_expanded) {
n = combobox->num_items;
h = combobox->base.area.h*n;
y2 = y1+h-1;
}
/* combobox background */
fgui_fill_rectangle(combobox->base.area.x, combobox->base.area.y, combobox->base.area.w, h,
FGUI_COMBOBOX_BG_COLOR);
if (fgui_combobox_type == 0){ // Cheap hack to multipurpose combobox
/* border */
fgui_draw_line(x1, y1, x2, y1, FGUI_COMBOBOX_BORDER_COLOR);
fgui_draw_line(x1, y2, x2, y2, FGUI_COMBOBOX_BORDER_COLOR);
fgui_draw_line(x1-2, y1+2, x1-2, y2-2, FGUI_COMBOBOX_BORDER_COLOR);
fgui_draw_line(x2+2, y1+2, x2+2, y2-2, FGUI_COMBOBOX_BORDER_COLOR);
/* border shading */
fgui_draw_line(x1, 1+y1, x2, 1+y1, FGUI_COMBOBOX_TOP_COLOR);
fgui_draw_line(x1, 2+y1, x2, 2+y1, FGUI_COMBOBOX_TOQ_COLOR);
fgui_draw_line(x1, 3+y1, x2, 3+y1, FGUI_COMBOBOX_TOR_COLOR);
fgui_draw_line(x1, y2-1, x2, y2-1, FGUI_COMBOBOX_BOT_COLOR);
fgui_draw_line(x1, y2-2, x2, y2-2, FGUI_COMBOBOX_BOQ_COLOR);
fgui_draw_line(x1, y2-3, x2, y2-3, FGUI_COMBOBOX_BOR_COLOR);
fgui_draw_line(x1-1, y1+2, x1-1, y2-2, FGUI_COMBOBOX_TOP_COLOR);
fgui_draw_line(x2+1, y1+2, x2+1, y2-2, FGUI_COMBOBOX_BOT_COLOR);
}
if (combobox->is_expanded) {
/* highlight current item */
fgui_fill_rectangle(x1-1, y1+1 + combobox->base.area.h * combobox->current_item,
combobox->base.area.w-2,
combobox->base.area.h-2,
FGUI_COMBOBOX_HIGHLIGHT_COLOR);
for (i = 0; i < combobox->num_items; i++) {
/* current item text */
fgui_draw_string(combobox->items[i].text,
x1, combobox->base.area.y+2 + combobox->base.area.h * i,
FGUI_COMBOBOX_TEXT_COLOR, NULL);
}
} else {
/* if focus, draw red border */
if (combobox->base.has_focus) {
fgui_draw_rectangle(combobox->base.area.x, combobox->base.area.y,
combobox->base.area.w, combobox->base.area.h,
FGUI_COMBOBOX_FOCUS_COLOR);
}
/* current item text */
fgui_draw_string(combobox->items[combobox->current_item].text,
x1, combobox->base.area.y+2,
FGUI_COMBOBOX_TEXT_COLOR, NULL);
/* draw arrow to indicate that this is a combobox */
fgui_draw_triangle(combobox->base.area.x + combobox->base.area.w - 15,
combobox->base.area.y + combobox->base.area.h / 2 - 2,
combobox->base.area.x + combobox->base.area.w - 5,
combobox->base.area.y + combobox->base.area.h / 2 - 2,
combobox->base.area.x + combobox->base.area.w - 10,
combobox->base.area.y + combobox->base.area.h / 2 + 3,
FGUI_COMBOBOX_BORDER_COLOR);
}
if (fgui_combobox_type == 0){ // Cheap hack to multipurpose combobox
/* draw rounded border corners */
fgui_set_pixel(x1-1,y1+1, FGUI_COMBOBOX_BORDER_COLOR);
fgui_set_pixel(x2+1,y1+1, FGUI_COMBOBOX_BORDER_COLOR);
fgui_set_pixel(x1-1,y2-1, FGUI_COMBOBOX_BORDER_COLOR);
fgui_set_pixel(x2+1,y2-1, FGUI_COMBOBOX_BORDER_COLOR);
}
}
void fgui_draw_point(uint16_t x, uint16_t y, uint32_t color, struct fgui_rect *clip)
{
if (clip == NULL || is_in_rect(x, y, clip)) {
fgui_set_pixel(x, y, color);
}
}
