caca_draw_circle (3)

NAME

caca_primitives - libcaca primitives drawing

Functions

__extern int caca_draw_line (caca_canvas_t *, int, int, int, int, uint32_t)
Draw a line on the canvas using the given character.
__extern int caca_draw_polyline (caca_canvas_t *, int const x[], int const y[], int, uint32_t)
Draw a polyline.
__extern int caca_draw_thin_line (caca_canvas_t *, int, int, int, int)
Draw a thin line on the canvas, using ASCII art.
__extern int caca_draw_thin_polyline (caca_canvas_t *, int const x[], int const y[], int)
Draw an ASCII art thin polyline.
__extern int caca_draw_circle (caca_canvas_t *, int, int, int, uint32_t)
Draw a circle on the canvas using the given character.
__extern int caca_draw_ellipse (caca_canvas_t *, int, int, int, int, uint32_t)
Draw an ellipse on the canvas using the given character.
__extern int caca_draw_thin_ellipse (caca_canvas_t *, int, int, int, int)
Draw a thin ellipse on the canvas.
__extern int caca_fill_ellipse (caca_canvas_t *, int, int, int, int, uint32_t)
Fill an ellipse on the canvas using the given character.
__extern int caca_draw_box (caca_canvas_t *, int, int, int, int, uint32_t)
Draw a box on the canvas using the given character.
__extern int caca_draw_thin_box (caca_canvas_t *, int, int, int, int)
Draw a thin box on the canvas.
__extern int caca_draw_cp437_box (caca_canvas_t *, int, int, int, int)
Draw a box on the canvas using CP437 characters.
__extern int caca_fill_box (caca_canvas_t *, int, int, int, int, uint32_t)
Fill a box on the canvas using the given character.
__extern int caca_draw_triangle (caca_canvas_t *, int, int, int, int, int, int, uint32_t)
Draw a triangle on the canvas using the given character.
__extern int caca_draw_thin_triangle (caca_canvas_t *, int, int, int, int, int, int)
Draw a thin triangle on the canvas.
__extern int caca_fill_triangle (caca_canvas_t *, int, int, int, int, int, int, uint32_t)
Fill a triangle on the canvas using the given character.
__extern int caca_fill_triangle_textured (caca_canvas_t *cv, int coords[6], caca_canvas_t *tex, float uv[6])
Fill a triangle on the canvas using an arbitrary-sized texture.

Detailed Description

These functions provide routines for primitive drawing, such as lines, boxes, triangles and ellipses.

Function Documentation

__extern int caca_draw_line (caca_canvas_t * cv, int x1, int y1, int x2, int y2, uint32_t ch)

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
x1 X coordinate of the first point.
y1 Y coordinate of the first point.
x2 X coordinate of the second point.
y2 Y coordinate of the second point.
ch UTF-32 character to be used to draw the line.

Returns:

This function always returns 0.

Referenced by caca_draw_box(), caca_draw_triangle(), and caca_fill_ellipse().

__extern int caca_draw_polyline (caca_canvas_t * cv, int const x[], int const y[], int n, uint32_t ch)

Draw a polyline on the canvas using the given character and coordinate arrays. The first and last points are not connected, hence in order to draw a polygon you need to specify the starting point at the end of the list as well.

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
x Array of X coordinates. Must have n + 1 elements.
y Array of Y coordinates. Must have n + 1 elements.
n Number of lines to draw.
ch UTF-32 character to be used to draw the lines.

Returns:

This function always returns 0.

__extern int caca_draw_thin_line (caca_canvas_t * cv, int x1, int y1, int x2, int y2)

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
x1 X coordinate of the first point.
y1 Y coordinate of the first point.
x2 X coordinate of the second point.
y2 Y coordinate of the second point.

Returns:

This function always returns 0.

Referenced by caca_draw_thin_triangle().

__extern int caca_draw_thin_polyline (caca_canvas_t * cv, int const x[], int const y[], int n)

Draw a thin polyline on the canvas using the given coordinate arrays and with ASCII art. The first and last points are not connected, so in order to draw a polygon you need to specify the starting point at the end of the list as well.

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
x Array of X coordinates. Must have n + 1 elements.
y Array of Y coordinates. Must have n + 1 elements.
n Number of lines to draw.

Returns:

This function always returns 0.

__extern int caca_draw_circle (caca_canvas_t * cv, int x, int y, int r, uint32_t ch)

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
x Center X coordinate.
y Center Y coordinate.
r Circle radius.
ch UTF-32 character to be used to draw the circle outline.

Returns:

This function always returns 0.

__extern int caca_draw_ellipse (caca_canvas_t * cv, int xo, int yo, int a, int b, uint32_t ch)

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
xo Center X coordinate.
yo Center Y coordinate.
a Ellipse X radius.
b Ellipse Y radius.
ch UTF-32 character to be used to draw the ellipse outline.

Returns:

This function always returns 0.

__extern int caca_draw_thin_ellipse (caca_canvas_t * cv, int xo, int yo, int a, int b)

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
xo Center X coordinate.
yo Center Y coordinate.
a Ellipse X radius.
b Ellipse Y radius.

Returns:

This function always returns 0.

__extern int caca_fill_ellipse (caca_canvas_t * cv, int xo, int yo, int a, int b, uint32_t ch)

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
xo Center X coordinate.
yo Center Y coordinate.
a Ellipse X radius.
b Ellipse Y radius.
ch UTF-32 character to be used to fill the ellipse.

Returns:

This function always returns 0.

References caca_draw_line().

__extern int caca_draw_box (caca_canvas_t * cv, int x, int y, int w, int h, uint32_t ch)

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
x X coordinate of the upper-left corner of the box.
y Y coordinate of the upper-left corner of the box.
w Width of the box.
h Height of the box.
ch UTF-32 character to be used to draw the box.

Returns:

This function always returns 0.

References caca_draw_line().

__extern int caca_draw_thin_box (caca_canvas_t * cv, int x, int y, int w, int h)

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
x X coordinate of the upper-left corner of the box.
y Y coordinate of the upper-left corner of the box.
w Width of the box.
h Height of the box.

Returns:

This function always returns 0.

__extern int caca_draw_cp437_box (caca_canvas_t * cv, int x, int y, int w, int h)

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
x X coordinate of the upper-left corner of the box.
y Y coordinate of the upper-left corner of the box.
w Width of the box.
h Height of the box.

Returns:

This function always returns 0.

__extern int caca_fill_box (caca_canvas_t * cv, int x, int y, int w, int h, uint32_t ch)

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
x X coordinate of the upper-left corner of the box.
y Y coordinate of the upper-left corner of the box.
w Width of the box.
h Height of the box.
ch UTF-32 character to be used to draw the box.

Returns:

This function always returns 0.

References caca_add_dirty_rect(), and caca_put_char().

Referenced by caca_conio_clreol().

__extern int caca_draw_triangle (caca_canvas_t * cv, int x1, int y1, int x2, int y2, int x3, int y3, uint32_t ch)

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
x1 X coordinate of the first point.
y1 Y coordinate of the first point.
x2 X coordinate of the second point.
y2 Y coordinate of the second point.
x3 X coordinate of the third point.
y3 Y coordinate of the third point.
ch UTF-32 character to be used to draw the triangle outline.

Returns:

This function always returns 0.

References caca_draw_line().

__extern int caca_draw_thin_triangle (caca_canvas_t * cv, int x1, int y1, int x2, int y2, int x3, int y3)

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
x1 X coordinate of the first point.
y1 Y coordinate of the first point.
x2 X coordinate of the second point.
y2 Y coordinate of the second point.
x3 X coordinate of the third point.
y3 Y coordinate of the third point.

Returns:

This function always returns 0.

References caca_draw_thin_line().

__extern int caca_fill_triangle (caca_canvas_t * cv, int x1, int y1, int x2, int y2, int x3, int y3, uint32_t ch)

This function never fails.

Parameters:

cv The handle to the libcaca canvas.
x1 X coordinate of the first point.
y1 Y coordinate of the first point.
x2 X coordinate of the second point.
y2 Y coordinate of the second point.
x3 X coordinate of the third point.
y3 Y coordinate of the third point.
ch UTF-32 character to be used to fill the triangle.

Returns:

This function always returns 0.

References caca_put_char().

__extern int caca_fill_triangle_textured (caca_canvas_t * cv, int coords[6], caca_canvas_t * tex, float uv[6])

This function fails if one or both the canvas are missing

Parameters:

cv The handle to the libcaca canvas.
coords The coordinates of the triangle (3{x,y})
tex The handle of the canvas texture.
uv The coordinates of the texture (3{u,v})

Returns:

This function return 0 if ok, -1 if canvas or texture are missing.

Author

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