#include <cmath>
#include <stdint.h>
#include <cairomm/context.h>
-#include "canvas/utils.h"
-
-using std::max;
-using std::min;
-
-void
-ArdourCanvas::color_to_hsv (Color color, double& h, double& s, double& v)
-{
- double r, g, b, a;
- double cmax;
- double cmin;
- double delta;
-
- color_to_rgba (color, r, g, b, a);
-
- if (r > g) {
- cmax = max (r, b);
- } else {
- cmax = max (g, b);
- }
-
- if (r < g) {
- cmin = min (r, b);
- } else {
- cmin = min (g, b);
- }
-
- v = cmax;
-
- delta = cmax - cmin;
-
- if (cmax == 0) {
- // r = g = b == 0 ... v is undefined, s = 0
- s = 0.0;
- h = -1.0;
- }
-
- if (delta != 0.0) {
- if (cmax == r) {
- h = fmod ((g - b)/delta, 6.0);
- } else if (cmax == g) {
- h = ((b - r)/delta) + 2;
- } else {
- h = ((r - g)/delta) + 4;
- }
-
- h *= 60.0;
- }
-
- if (delta == 0 || cmax == 0) {
- s = 0;
- } else {
- s = delta / cmax;
- }
-
-}
-
-ArdourCanvas::Color
-ArdourCanvas::hsv_to_color (double h, double s, double v, double a)
-{
- s = min (1.0, max (0.0, s));
- v = min (1.0, max (0.0, v));
-
- if (s == 0) {
- // achromatic (grey)
- return rgba_to_color (v, v, v, a);
- }
-
- h = min (360.0, max (0.0, h));
-
- double c = v * s;
- double x = c * (1.0 - fabs(fmod(h / 60.0, 2) - 1.0));
- double m = v - c;
-
- if (h >= 0.0 && h < 60.0) {
- return rgba_to_color (c + m, x + m, m, a);
- } else if (h >= 60.0 && h < 120.0) {
- return rgba_to_color (x + m, c + m, m, a);
- } else if (h >= 120.0 && h < 180.0) {
- return rgba_to_color (m, c + m, x + m, a);
- } else if (h >= 180.0 && h < 240.0) {
- return rgba_to_color (m, x + m, c + m, a);
- } else if (h >= 240.0 && h < 300.0) {
- return rgba_to_color (x + m, m, c + m, a);
- } else if (h >= 300.0 && h < 360.0) {
- return rgba_to_color (c + m, m, x + m, a);
- }
- return rgba_to_color (m, m, m, a);
-}
-
-void
-ArdourCanvas::color_to_rgba (Color color, double& r, double& g, double& b, double& a)
-{
- r = ((color >> 24) & 0xff) / 255.0;
- g = ((color >> 16) & 0xff) / 255.0;
- b = ((color >> 8) & 0xff) / 255.0;
- a = ((color >> 0) & 0xff) / 255.0;
-}
-ArdourCanvas::Color
-ArdourCanvas::rgba_to_color (double r, double g, double b, double a)
-{
- /* clamp to [0 .. 1] range */
-
- r = min (1.0, max (0.0, r));
- g = min (1.0, max (0.0, g));
- b = min (1.0, max (0.0, b));
- a = min (1.0, max (0.0, a));
-
- /* convert to [0..255] range */
-
- unsigned int rc, gc, bc, ac;
- rc = rint (r * 255.0);
- gc = rint (g * 255.0);
- bc = rint (b * 255.0);
- ac = rint (a * 255.0);
-
- /* build-an-integer */
-
- return (rc << 24) | (gc << 16) | (bc << 8) | ac;
-}
-
-void
-ArdourCanvas::set_source_rgba (Cairo::RefPtr<Cairo::Context> context, Color color)
-{
- context->set_source_rgba (
- ((color >> 24) & 0xff) / 255.0,
- ((color >> 16) & 0xff) / 255.0,
- ((color >> 8) & 0xff) / 255.0,
- ((color >> 0) & 0xff) / 255.0
- );
-}
-
-void
-ArdourCanvas::set_source_rgb_a (Cairo::RefPtr<Cairo::Context> context, Color color, float alpha)
-{
- context->set_source_rgba (
- ((color >> 24) & 0xff) / 255.0,
- ((color >> 16) & 0xff) / 255.0,
- ((color >> 8) & 0xff) / 255.0,
- alpha
- );
-}
-
-void
-ArdourCanvas::set_source_rgba (cairo_t *cr, Color color)
-{
- cairo_set_source_rgba ( cr,
- ((color >> 24) & 0xff) / 255.0,
- ((color >> 16) & 0xff) / 255.0,
- ((color >> 8) & 0xff) / 255.0,
- ((color >> 0) & 0xff) / 255.0
- );
-}
+#include "canvas/utils.h"
-void
-ArdourCanvas::set_source_rgb_a (cairo_t *cr, Color color, float alpha)
-{
- cairo_set_source_rgba ( cr,
- ((color >> 24) & 0xff) / 255.0,
- ((color >> 16) & 0xff) / 255.0,
- ((color >> 8) & 0xff) / 255.0,
- alpha
- );
-}
+using namespace std;
+using namespace ArdourCanvas;
ArdourCanvas::Distance
ArdourCanvas::distance_to_segment_squared (Duple const & p, Duple const & p1, Duple const & p2, double& t, Duple& at)
at = p1;
t = 0.0;
return ((dp1x * dp1x) + (dp1y * dp1y));
- }
+ }
// Project a line from p to the segment [p1,p2]. By considering the line
// extending the segment, parameterized as p1 + (t * (p2 - p1)),
- // we find projection of point p onto the line.
+ // we find projection of point p onto the line.
// It falls where t = [(p - p1) . (p2 - p1)] / |p2 - p1|^2
-
+
t = ((dp1x * dx) + (dp1y * dy)) / segLenSquared;
if (t < kEpsilon) {
return ((dpqx * dpqx) + (dpqy * dpqy));
}
-
-uint32_t
-ArdourCanvas::contrasting_text_color (uint32_t c)
-{
- double r, g, b, a;
- ArdourCanvas::color_to_rgba (c, r, g, b, a);
-
- const double black_r = 0.0;
- const double black_g = 0.0;
- const double black_b = 0.0;
-
- const double white_r = 1.0;
- const double white_g = 1.0;
- const double white_b = 1.0;
-
- /* Use W3C contrast guideline calculation */
-
- double white_contrast = (max (r, white_r) - min (r, white_r)) +
- (max (g, white_g) - min (g, white_g)) +
- (max (b, white_b) - min (b, white_b));
-
- double black_contrast = (max (r, black_r) - min (r, black_r)) +
- (max (g, black_g) - min (g, black_g)) +
- (max (b, black_b) - min (b, black_b));
-
- if (white_contrast > black_contrast) {
- /* use white */
- return ArdourCanvas::rgba_to_color (1.0, 1.0, 1.0, 1.0);
- } else {
- /* use black */
- return ArdourCanvas::rgba_to_color (0.0, 0.0, 0.0, 1.0);
- }
-}