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lv_canvas: add basic drawing functionalities

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seyyah
2019-01-25 14:14:22 +03:00
parent 5c33fb67e5
commit 98b6e446f0
2 changed files with 225 additions and 0 deletions
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208
lv_objx/lv_canvas.c
View File

@@ -114,6 +114,28 @@ void lv_canvas_set_px(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_color_t
memcpy((void*)&ext->dsc.data[px], &c, sizeof(lv_color_t));
}
/**
* Get the color of a pixel on the canvas
* @param canvas
* @param x x coordinate of the point to set
* @param y x coordinate of the point to set
* @param c color of the point
*/
void lv_canvas_get_px(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_color_t * c)
{
lv_canvas_ext_t * ext = lv_obj_get_ext_attr(canvas);
if(x >= ext->dsc.header.w || y >= ext->dsc.header.h) {
LV_LOG_WARN("lv_canvas_get_px: x or y out of the canvas");
return;
}
uint32_t px_size = lv_img_color_format_get_px_size(ext->dsc.header.cf) >> 3;
uint32_t px = ext->dsc.header.w * y * px_size + x * px_size;
memcpy(c, (void*)&ext->dsc.data[px], sizeof(lv_color_t));
}
/**
* Copy a buffer to the canvas
* @param canvas pointer to a canvas object
@@ -259,6 +281,192 @@ lv_style_t * lv_canvas_get_style(const lv_obj_t * canvas, lv_canvas_style_t type
* Other functions
*====================*/
/**
* Draw circle function of the canvas
* @param canvas pointer to a canvas object
* @param x0 x coordinate of the circle
* @param y0 y coordinate of the circle
* @param radius radius of the circle
* @param color border color of the circle
*/
void lv_canvas_draw_circle(lv_obj_t * canvas, lv_coord_t x0, lv_coord_t y0, lv_coord_t radius, lv_color_t color)
{
int x = radius;
int y = 0;
int err = 0;
while (x >= y)
{
lv_canvas_set_px(canvas, x0 + x, y0 + y, color);
lv_canvas_set_px(canvas, x0 + y, y0 + x, color);
lv_canvas_set_px(canvas, x0 - y, y0 + x, color);
lv_canvas_set_px(canvas, x0 - x, y0 + y, color);
lv_canvas_set_px(canvas, x0 - x, y0 - y, color);
lv_canvas_set_px(canvas, x0 - y, y0 - x, color);
lv_canvas_set_px(canvas, x0 + y, y0 - x, color);
lv_canvas_set_px(canvas, x0 + x, y0 - y, color);
if (err <= 0)
{
y += 1;
err += 2*y + 1;
}
if (err > 0)
{
x -= 1;
err -= 2*x + 1;
}
}
}
/**
* Draw line function of the canvas
* @param canvas pointer to a canvas object
* @param point1 start point of the line
* @param point2 end point of the line
* @param color color of the line
*/
void lv_canvas_draw_line(lv_obj_t * canvas, lv_point_t point1, lv_point_t point2, lv_color_t color)
{
lv_coord_t x0, y0, x1, y1;
x0 = point1.x;
y0 = point1.y;
x1 = point2.x;
y1 = point2.y;
int dx = abs(x1-x0), sx = x0<x1 ? 1 : -1;
int dy = abs(y1-y0), sy = y0<y1 ? 1 : -1;
int err = (dx>dy ? dx : -dy)/2, e2;
for(;;){
// setPixel(x0,y0);
lv_canvas_set_px(canvas, x0, y0, color);
if (x0==x1 && y0==y1) break;
e2 = err;
if (e2 >-dx) { err -= dy; x0 += sx; }
if (e2 < dy) { err += dx; y0 += sy; }
}
}
/**
* Draw triangle function of the canvas
* @param canvas pointer to a canvas object
* @param points edge points of the triangle
* @param color line color of the triangle
*/
void lv_canvas_draw_triangle(lv_obj_t * canvas, lv_point_t * points, lv_color_t color)
{
lv_canvas_draw_polygon(canvas, points, 3, color);
}
/**
* Draw rectangle function of the canvas
* @param canvas pointer to a canvas object
* @param points edge points of the rectangle
* @param color line color of the rectangle
*/
void lv_canvas_draw_rect(lv_obj_t * canvas, lv_point_t * points, lv_color_t color)
{
lv_canvas_draw_polygon(canvas, points, 4, color);
}
/**
* Draw polygon function of the canvas
* @param canvas pointer to a canvas object
* @param points edge points of the polygon
* @param size edge count of the polygon
* @param color line color of the polygon
*/
void lv_canvas_draw_polygon(lv_obj_t * canvas, lv_point_t * points, size_t size, lv_color_t color)
{
uint8_t i;
for(i=0; i < (size - 1); i++) {
lv_canvas_draw_line(canvas, points[i], points[i + 1], color);
}
lv_canvas_draw_line(canvas, points[size - 1], points[0], color);
}
/**
* Fill polygon function of the canvas
* @param canvas pointer to a canvas object
* @param points edge points of the polygon
* @param size edge count of the polygon
* @param color line color of the polygon
* @param bg_color background color of the polygon
*/
void lv_canvas_fill_polygon(lv_obj_t * canvas, lv_point_t * points, size_t size, lv_color_t color, lv_color_t bg_color)
{
uint32_t x = 0, y = 0;
uint8_t i;
for(i=0; i<size; i++) {
x += points[i].x;
y += points[i].y;
}
x = x / size;
y = y / size;
// lv_canvas_flood_fill(canvas, (lv_coord_t) x, (lv_coord_t) y, color, bg_color);
lv_canvas_boundary_fill4(canvas, (lv_coord_t) x, (lv_coord_t) y, color, color);
}
/**
* Boundary fill function of the canvas
* @param canvas pointer to a canvas object
* @param x x coordinate of the start position (seed)
* @param y y coordinate of the start position (seed)
* @param fill_color fill color of the area
* @param boundary_color edge/boundary color of the area
*/
void lv_canvas_boundary_fill4(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_color_t fill_color, lv_color_t boundary_color)
{
lv_color_t c;
lv_canvas_get_px(canvas, x, y, &c);
if(c.full != boundary_color.full &&
c.full != fill_color.full)
{
// putpixel(x, y, fill_color);
lv_canvas_set_px(canvas, x, y, fill_color);
lv_canvas_boundary_fill4(canvas, x + 1, y, fill_color, boundary_color);
lv_canvas_boundary_fill4(canvas, x, y + 1, fill_color, boundary_color);
lv_canvas_boundary_fill4(canvas, x - 1, y, fill_color, boundary_color);
lv_canvas_boundary_fill4(canvas, x, y - 1, fill_color, boundary_color);
}
}
/**
* Flood fill function of the canvas
* @param canvas pointer to a canvas object
* @param x x coordinate of the start position (seed)
* @param y y coordinate of the start position (seed)
* @param fill_color fill color of the area
* @param bg_color background color of the area
*/
void lv_canvas_flood_fill(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_color_t fill_color, lv_color_t bg_color)
{
lv_color_t c;
lv_canvas_get_px(canvas, x, y, &c);
if(c.full == bg_color.full)
{
lv_canvas_set_px(canvas, x, y, fill_color);
lv_canvas_flood_fill(canvas, x+1, y, fill_color, bg_color);
lv_canvas_flood_fill(canvas, x, y+1, fill_color, bg_color);
lv_canvas_flood_fill(canvas, x-1, y, fill_color, bg_color);
lv_canvas_flood_fill(canvas, x, y-1, fill_color, bg_color);
}
}
/**********************
* STATIC FUNCTIONS

17
lv_objx/lv_canvas.h
View File

@@ -71,6 +71,15 @@ lv_obj_t * lv_canvas_create(lv_obj_t * par, const lv_obj_t * copy);
*/
void lv_canvas_set_px(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_color_t c);
/**
* Get the color of a pixel on the canvas
* @param canvas
* @param x x coordinate of the point to set
* @param y x coordinate of the point to set
* @param c color of the point
*/
void lv_canvas_get_px(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_color_t * c);
/**
* Copy a buffer to the canvas
* @param canvas pointer to a canvas object
@@ -138,6 +147,14 @@ lv_style_t * lv_canvas_get_style(const lv_obj_t * canvas, lv_canvas_style_t type
/*=====================
* Other functions
*====================*/
void lv_canvas_draw_circle(lv_obj_t * canvas, lv_coord_t x0, lv_coord_t y0, lv_coord_t radius, lv_color_t color);
void lv_canvas_draw_line(lv_obj_t * canvas, lv_point_t point1, lv_point_t point2, lv_color_t color);
void lv_canvas_draw_triangle(lv_obj_t * canvas, lv_point_t * points, lv_color_t color);
void lv_canvas_draw_rect(lv_obj_t * canvas, lv_point_t * points, lv_color_t color);
void lv_canvas_draw_polygon(lv_obj_t * canvas, lv_point_t * points, size_t size, lv_color_t color);
void lv_canvas_fill_polygon(lv_obj_t * canvas, lv_point_t * points, size_t size, lv_color_t color, lv_color_t bg_color);
void lv_canvas_boundary_fill4(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_color_t fill_color, lv_color_t boundary_color);
void lv_canvas_flood_fill(lv_obj_t * canvas, lv_coord_t x, lv_coord_t y, lv_color_t fill_color, lv_color_t bg_color);
/**********************
* MACROS