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Recognise some symbolic colors (red, green, blue, yellow, black, white, gr[ae]y, and more)

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This commit is contained in:
Rogier 2015-02-15 08:44:44 +01:00
parent 59bae48fc7
commit 1854ef34e6
3 changed files with 52 additions and 3 deletions
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48
Color.cpp
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@ -2,16 +2,60 @@
#include <cctype>
#include <stdexcept>
#include <cstdlib>
#include <map>
#include <string>
#include <cctype>
#include "Color.h"
class ColorTable : public std::map<std::string, Color>
{
public:
ColorTable(void)
{
map<std::string, Color> &table = *this;
table["white"] = Color(0xff, 0xff, 0xff);
table["black"] = Color(0, 0, 0);
table["gray"] = Color(0x7f, 0x7f, 0x7f);
table["grey"] = Color(0x7f, 0x7f, 0x7f);
table["red"] = Color(0xff, 0, 0);
table["green"] = Color(0, 0xff, 0);
table["blue"] = Color(0, 0, 0xff);
table["yellow"] = Color(0xff, 0xff, 0);
table["magenta"] = Color(0xff, 0, 0xff);
table["fuchsia"] = Color(0xff, 0, 0xff);
table["cyan"] = Color(0, 0xff, 0xff);
table["aqua"] = Color(0, 0xff, 0xff);
table["orange"] = Color(0xff, 0x7f, 0);
table["chartreuse"] = Color(0x7f, 0xff, 0);
table["pink"] = Color(0xff, 0, 0x7f);
table["violet"] = Color(0x7f, 0, 0xff);
table["springgreen"] = Color(0, 0xff, 0x7f);
table["azure"] = Color(0, 0x7f, 0xff);
table["brown"] = Color(0x7f, 0x3f, 0);
}
};
ColorTable colorTable;
// alpha:
// 0: don't expect/allow alpha
// 1: allow alpha; defaults to 255 (0xff)
// -1: allow alpha but ignore - set to to 255 (0xff)
Color::Color(const std::string &color, int alpha)
Color::Color(std::string color, int alpha)
{
if (color[0] != '#') {
throw std::runtime_error("Color does not begin with #");
int l = color.length();
for (int i = 0; i < l; i++)
color[i] = tolower(color[i]);
if (colorTable.count(color) > 0) {
*this = colorTable[color];
return;
}
throw std::runtime_error(std::string("Symbolic color '") + color + "' not known, or color does not begin with #");
}
if (std::string::npos != color.find_first_not_of("0123456789abcdefABCDEF",1)) {
throw std::runtime_error("Color value has invalid digits (expected: [0-9a-zA-Z])");

2
Color.h
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@ -9,7 +9,7 @@ struct Color {
Color(uint32_t c): r((c >> 16) & 0xff), g((c >> 8) & 0xff), b((c >> 0) & 0xff ), a((c >> 24) & 0xff) {};
Color(uint8_t r, uint8_t g, uint8_t b): r(r), g(g), b(b), a(0xff) {};
Color(uint8_t r, uint8_t g, uint8_t b, uint8_t a): r(r), g(g), b(b), a(a) {};
Color(const std::string &s, int alpha = 1);
Color(std::string s, int alpha = 1);
Color &operator=(const Color &c);
unsigned to_uint() const { return (unsigned(a) << 24) + (unsigned(r) << 16) + (unsigned(g) << 8) + unsigned(b); }
//libgd treats 127 as transparent, and 0 as opaque ...

5
mapper.cpp
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@ -108,6 +108,11 @@ void usage()
"Color formats:\n"
"\t'#000' or '#000000' (RGB)\n"
"\t'#0000' or '#0000000' (ARGB - usable if an alpha value is allowed)\n"
"\tSome symbolic color names:\n"
"\t\twhite, black, gray, grey, red, green, blue,\n"
"\t\tyellow, magenta, fuchsia, cyan, aqua,\n"
"\t\torange, chartreuse, pink, violet, springgreen, azure\n"
"\t\tbrown (= 50% orange)\n"
"Geometry formats:\n"
"\t<width>x<heigth>[+|-<xoffset>+|-<yoffset>] (dimensions and corner)\n"
"\t<xoffset>,<yoffset>+<width>+<height> (corner and dimensions)\n"