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a simple colorpicker in GTK
//=====================================================================
// 拾取颜色并输出
// 返回值:
// 0 正常
// 1 被取消
// 2 语法错
//---------------------------------------------------------------------
#include<gtk/gtk.h>
#include<ctype.h>
//---------------------------------------------------------------------
/* 程序名称 */
char* self = NULL;
void usage(){
printf("Colorpicker --- Pick color and print it\n\n"
"Usage: %s [init_color]\n\n"
"`init_color' should be in the form of #xxxxxx or rgba(r, g, b, a)\n"
"If alpha is not 255, a `rgba' notation of the color is printed "
"instead.\n"
"If cancelled, nothing is printed and 1 is returned.\n\n"
"by lilydjwg@gmail.com, 2010-08-16, ver 0.2\n"
, self);
}
gint main(gint argc, gchar * argv[]){
GtkWidget *colorseldlg;
GdkColor color;
GtkColorSelection *colorsel;
gint response;
gint r, g, b;
guint16 alpha=65535;
float f;
self = argv[0];
gtk_init(&argc, &argv);
if(argc == 2){
g = 0;
b = 0;
if(argv[1][0] == 'r'){
if(argv[1][3] == 'a'){
//rgba(...)
sscanf(argv[1], "rgba(%d, %d, %d, %f)", &r, &g, &b, &f);
color.red = r * 256;
color.green = g * 256;
color.blue = b * 256;
alpha = f * 65535;
}else if(argv[1][3] == '('){
//rgb(...)
sscanf(argv[1], "rgb(%d, %d, %d)", &r, &g, &b);
color.red = r * 256;
color.green = g * 256;
color.blue = b * 256;
}else{
usage();
return 2;
}
goto option_ok;
}
if(argv[1][0] == '#'){
b = 1;
}
for(r=b; r<b+6; r++){
if(!isxdigit(argv[1][r])){
usage();
return 2;
}
}
if(b){
/* # 开头 */
argv[1]++;
}
sscanf(argv[1], "%2x%2x%2x", &r, &g, &b);
color.red = r * 256;
color.green = g * 256;
color.blue = b * 256;
}else if(argc == 1){
color.red = 0xffff;
color.green = 0xffff;
color.blue = 0xffff;
}else{
usage();
return 2;
}
option_ok:
colorseldlg = gtk_color_selection_dialog_new("Select color");
colorsel = GTK_COLOR_SELECTION(
gtk_color_selection_dialog_get_color_selection(
GTK_COLOR_SELECTION_DIALOG(colorseldlg)));
gtk_color_selection_set_current_color(colorsel, &color);
gtk_color_selection_set_has_palette(colorsel, TRUE);
gtk_color_selection_set_has_opacity_control(colorsel, TRUE);
gtk_color_selection_set_current_alpha(colorsel, alpha);
gtk_window_set_position(GTK_WINDOW(colorseldlg), GTK_WIN_POS_MOUSE);
gtk_window_set_keep_above(GTK_WINDOW(colorseldlg), TRUE);
response = gtk_dialog_run(GTK_DIALOG(colorseldlg));
if(response == GTK_RESPONSE_OK){
gtk_color_selection_get_current_color(colorsel, &color);
r = color.red / 256;
g = color.green / 256;
b = color.blue / 256;
alpha = gtk_color_selection_get_current_alpha(colorsel);
alpha /= 256;
if(alpha == 255)
printf("#%02x%02x%02x\n", r, g, b);
else
printf("rgba(%d, %d, %d, %.2f)\n", r, g, b, (float)alpha/256);
}else
/* 取消了 */
return 1;
return 0;
}
//=====================================================================

dxcqcv commented Apr 25, 2016

这个怎么安装捏?

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