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adding lv_chart_draw_areas function

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after adding this function it is possible to plot the area type chart too.
This commit is contained in:
Ali Rostami
2019-03-14 11:18:53 +03:30
committed by GitHub
parent 02e5ed8b16
commit 22ad2e0ec1
1 changed files with 68 additions and 0 deletions
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68
lv_objx/lv_chart.c
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@@ -35,6 +35,7 @@ static void lv_chart_draw_lines(lv_obj_t * chart, const lv_area_t * mask);
static void lv_chart_draw_points(lv_obj_t * chart, const lv_area_t * mask);
static void lv_chart_draw_cols(lv_obj_t * chart, const lv_area_t * mask);
static void lv_chart_draw_vertical_lines(lv_obj_t * chart, const lv_area_t * mask);
static void lv_chart_draw_areas(lv_obj_t * chart, const lv_area_t * mask);
/**********************
* STATIC VARIABLES
@@ -490,6 +491,7 @@ static bool lv_chart_design(lv_obj_t * chart, const lv_area_t * mask, lv_design_
if(ext->type & LV_CHART_TYPE_COLUMN) lv_chart_draw_cols(chart, mask);
if(ext->type & LV_CHART_TYPE_POINT) lv_chart_draw_points(chart, mask);
if(ext->type & LV_CHART_TYPE_VERTICAL_LINE) lv_chart_draw_vertical_lines(chart, mask);
if(ext->type & LV_CHART_TYPE_AREA) lv_chart_draw_areas(chart, mask);
}
return true;
}
@@ -819,4 +821,70 @@ static void lv_chart_draw_vertical_lines(lv_obj_t * chart, const lv_area_t * mas
}
}
}
/**
* Draw the data lines as areas on a chart
* @param obj pointer to chart object
*/
static void lv_chart_draw_areas(lv_obj_t * chart, const lv_area_t * mask)
{
lv_chart_ext_t * ext = lv_obj_get_ext_attr(chart);
uint16_t i;
lv_point_t p1;
lv_point_t p2;
lv_coord_t w = lv_obj_get_width(chart);
lv_coord_t h = lv_obj_get_height(chart);
lv_coord_t x_ofs = chart->coords.x1;
lv_coord_t y_ofs = chart->coords.y1;
int32_t y_tmp;
lv_coord_t p_prev;
lv_coord_t p_act;
lv_chart_series_t * ser;
lv_opa_t opa_scale = lv_obj_get_opa_scale(chart);
lv_style_t style;
lv_style_copy(&style, &lv_style_plain);
style.line.opa = ext->series.opa;
style.line.width = ext->series.width;
/*Go through all data lines*/
LL_READ_BACK(ext->series_ll, ser) {
style.line.color = ser->color;
p1.x = 0 + x_ofs;
p2.x = 0 + x_ofs;
p_prev = ser->start_point;
y_tmp = (int32_t)((int32_t) ser->points[p_prev] - ext->ymin) * h;
y_tmp = y_tmp / (ext->ymax - ext->ymin);
p2.y = h - y_tmp + y_ofs;
for(i = 1; i < ext->point_cnt; i ++) {
p1.x = p2.x;
p1.y = p2.y;
p2.x = ((w * i) / (ext->point_cnt - 1)) + x_ofs;
p_act = (ser->start_point + i) % ext->point_cnt;
y_tmp = (int32_t)((int32_t) ser->points[p_act] - ext->ymin) * h;
y_tmp = y_tmp / (ext->ymax - ext->ymin);
p2.y = h - y_tmp + y_ofs;
if(ser->points[p_prev] != LV_CHART_POINT_DEF && ser->points[p_act] != LV_CHART_POINT_DEF) {
lv_point_t triangle_points[3];
triangle_points[0] = p1;
triangle_points[1].x = p2.x;
triangle_points[1].y = y_ofs + h;
triangle_points[2].x = p1.x;
triangle_points[2].y = y_ofs + h;
lv_draw_triangle(triangle_points, mask, style.line.color);
triangle_points[2] = p2;
lv_draw_triangle(triangle_points, mask, style.line.color);
}
p_prev = p_act;
}
}
}
#endif