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Added gfx.linedRectangle and gfx.linedCircle

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Reuh 2016-04-29 17:55:59 +02:00
parent 707b1a451e
commit b4ceb200ea
2 changed files with 107 additions and 2 deletions
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108
source/gfx.c
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@ -35,6 +35,14 @@ scissor_state lua_scissor = {
0, 0
};
// Rotate a point (x,y) around the center (cx,cy) by angle radians.
void rotatePoint(int x, int y, int cx, int cy, float angle, int* outx, int* outy) {
float s = sin(angle), c = cos(angle);
int tx = x - cx, ty = y - cy;
*outx = round(tx * c - ty * s) + cx;
*outy = round(tx * s + ty * c) + cy;
}
/***
The `ctr.gfx.color` module.
@table color
@ -227,7 +235,7 @@ static int gfx_point(lua_State *L) {
}
/***
Draw a rectangle on the current screen.
Draw a filled rectangle on the current screen.
@function rectangle
@tparam integer x rectangle origin horizontal coordinate, in pixels
@tparam integer y rectangle origin vertical coordinate, in pixels
@ -254,7 +262,51 @@ static int gfx_rectangle(lua_State *L) {
}
/***
Draw a circle on the current screen.
Draw a rectangle outline on the current screen.
@function linedRectangle
@tparam integer x rectangle origin horizontal coordinate, in pixels
@tparam integer y rectangle origin vertical coordinate, in pixels
@tparam integer width rectangle width, in pixels
@tparam integer height rectangle height, in pixels
@tparam[opt=1] integer lineWidth line's thickness, in pixels
@tparam[opt=0] number angle rectangle rotation, in radians
@tparam[opt=default color] integer color drawing color
*/
static int gfx_linedRectangle(lua_State *L) {
int x = luaL_checkinteger(L, 1);
int y = luaL_checkinteger(L, 2);
int width = luaL_checkinteger(L, 3);
int height = luaL_checkinteger(L, 4);
float lineWidth = luaL_optnumber(L, 5, 1.0f);
float angle = luaL_optnumber(L, 6, 0);
u32 color = luaL_optinteger(L, 7, color_default);
// Corner coordinates
int x2 = x + width, y2 = y;
int x3 = x2, y3 = y + height;
int x4 = x, y4 = y3;
// Rotate corners
if (angle != 0) {
int cx = x + width/2, cy = y + height/2;
rotatePoint(x, y, cx, cy, angle, &x, &y );
rotatePoint(x2, y2, cx, cy, angle, &x2, &y2);
rotatePoint(x3, y3, cx, cy, angle, &x3, &y3);
rotatePoint(x4, y4, cx, cy, angle, &x4, &y4);
}
// Draw lines
sf2d_draw_line(x, y, x2, y2, lineWidth, color);
sf2d_draw_line(x2, y2, x3, y3, lineWidth, color);
sf2d_draw_line(x3, y3, x4, y4, lineWidth, color);
sf2d_draw_line(x4, y4, x, y, lineWidth, color);
return 0;
}
/***
Draw a filled circle on the current screen.
@function circle
@tparam integer x circle center horizontal coordinate, in pixels
@tparam integer y circle center vertical coordinate, in pixels
@ -273,6 +325,56 @@ static int gfx_circle(lua_State *L) {
return 0;
}
/***
Draw a circle outline on the current screen.
@function linedCircle
@tparam integer x circle center horizontal coordinate, in pixels
@tparam integer y circle center vertical coordinate, in pixels
@tparam integer radius circle radius, in pixels
@tparam[opt=1] integer width line's thickness, in pixels
@tparam[opt=default color] integer color drawing color
*/
static int gfx_linedCircle(lua_State *L) {
int x0 = luaL_checkinteger(L, 1);
int y0 = luaL_checkinteger(L, 2);
int radius = luaL_checkinteger(L, 3);
float width = luaL_optnumber(L, 4, 1.0f);
u32 color = luaL_optinteger(L, 5, color_default);
for (int r = ceil(radius - width/2), maxr = ceil(radius + width/2)-1; r <= maxr; r++) {
// Implementatin of the Andres circle algorithm.
int x = 0;
int y = r;
int d = r - 1;
while (y >= x) {
// Best way to draw a lot of points, 10/10
sf2d_draw_rectangle(x0 + x , y0 + y, 1, 1, color);
sf2d_draw_rectangle(x0 + y , y0 + x, 1, 1, color);
sf2d_draw_rectangle(x0 - x , y0 + y, 1, 1, color);
sf2d_draw_rectangle(x0 - y , y0 + x, 1, 1, color);
sf2d_draw_rectangle(x0 + x , y0 - y, 1, 1, color);
sf2d_draw_rectangle(x0 + y , y0 - x, 1, 1, color);
sf2d_draw_rectangle(x0 - x , y0 - y, 1, 1, color);
sf2d_draw_rectangle(x0 - y , y0 - x, 1, 1, color);
if (d >= 2*x) {
d -= 2*x + 1;
x++;
} else if (d < 2*(r-y)) {
d += 2*y - 1;
y--;
} else {
d += 2*(y - x - 1);
y--;
x++;
}
}
}
return 0;
}
/***
Draw a text on the current screen.
@function text
@ -580,7 +682,9 @@ static const struct luaL_Reg gfx_lib[] = {
{ "line", gfx_line },
{ "point", gfx_point },
{ "rectangle", gfx_rectangle },
{ "linedRectangle", gfx_linedRectangle },
{ "circle", gfx_circle },
{ "linedCircle", gfx_linedCircle },
{ "text", gfx_text },
{ "wrappedText", gfx_wrappedText },
{ "calcBoundingBox", gfx_calcBoundingBox },