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add color picker example

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git-svn-id: http://svn2.nishi.boats/svn/milsko/trunk@381 b9cfdab3-6d41-4d17-bbe4-086880011989
This commit is contained in:
IoIxD
2025-10-16 22:12:06 +00:00
parent caf2d110d1
commit e5c41d7295
4 changed files with 169 additions and 12 deletions
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4
GNUmakefile
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@@ -130,7 +130,7 @@ L_OBJS += src/backend/mac/mac.o src/backend/mac/carbon.o
LIB = lib
SO = .dylib
EXEC =
EXEC =
SHARED = -dynamiclib
endif
@@ -141,7 +141,7 @@ else
include external/deps.mk
endif
EXAMPLES = examples/basic/example$(EXEC) examples/basic/rotate$(EXEC) examples/basic/image$(EXEC) examples/basic/scrollbar$(EXEC) examples/basic/checkbox$(EXEC) examples/basic/messagebox$(EXEC) examples/basic/viewport$(EXEC) examples/basic/listbox$(EXEC)
EXAMPLES = examples/basic/example$(EXEC) examples/basic/rotate$(EXEC) examples/basic/image$(EXEC) examples/basic/scrollbar$(EXEC) examples/basic/checkbox$(EXEC) examples/basic/messagebox$(EXEC) examples/basic/viewport$(EXEC) examples/basic/listbox$(EXEC) examples/color_picker$(EXEC)
ifeq ($(OPENGL),1)
L_OBJS += src/widget/opengl.o

152
examples/color_picker.c Normal file
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@@ -0,0 +1,152 @@
/* $Id$ */
#include <Mw/Milsko.h>
MwWidget vp;
#define WIN_SIZE 512
#define PICKER_SIZE 360
#define IMG_POS ((WIN_SIZE - PICKER_SIZE) / 2)
#define IMAGE_SIZE (PICKER_SIZE * PICKER_SIZE * 4)
typedef struct {
double r; // a fraction between 0 and 1
double g; // a fraction between 0 and 1
double b; // a fraction between 0 and 1
} rgb;
typedef struct {
double h; // angle in degrees
double s; // a fraction between 0 and 1
double v; // a fraction between 0 and 1
} hsv;
static rgb hsv2rgb(hsv in) {
rgb out;
int i = (int)(floor(in.h * 6));
double f = in.h * 6 - i;
double p = in.v * (1 - in.s);
double q = in.v * (1 - f * in.s);
double t = in.v * (1 - (1 - f) * in.s);
switch(i % 6) {
case 0:
out.r = in.v, out.g = t, out.b = p;
break;
case 1:
out.r = q, out.g = in.v, out.b = p;
break;
case 2:
out.r = p, out.g = in.v, out.b = t;
break;
case 3:
out.r = p, out.g = q, out.b = in.v;
break;
case 4:
out.r = t, out.g = p, out.b = in.v;
break;
case 5:
out.r = in.v, out.g = p, out.b = q;
break;
}
return out;
}
typedef struct {
MwWidget parent;
MwWidget color_wheel_img;
MwWidget slider;
MwLLPixmap pixmap;
double value;
} color_wheel;
void color_wheel_update(color_wheel* wheel) {
unsigned char* data = malloc(IMAGE_SIZE);
for(int y = 0; y < PICKER_SIZE; y++) {
for(int x = 0; x < PICKER_SIZE; x++) {
int i = ((y * PICKER_SIZE) + x) * 4;
int _x = x - (PICKER_SIZE / 2);
int _y = y - (PICKER_SIZE / 2);
double dist = sqrt(_x * _x + _y * _y);
if(dist >= 180.) {
data[i] = 0;
data[i + 1] = 0;
data[i + 2] = 0;
data[i + 3] = 0;
} else {
double xd = (M_PI / 180.) * ((double)_x);
double yd = (M_PI / 180.) * ((double)_y);
float angle = atan2(yd, xd) - M_PI;
float hue = (angle * 180.) / M_PI;
if(hue < 0.0) {
hue += 360;
}
rgb color = hsv2rgb((hsv){
.h = hue / 360.,
.s = dist / 179.61,
.v = wheel->value,
});
data[i] = color.r * 255;
data[i + 1] = color.g * 255;
data[i + 2] = color.b * 255;
data[i + 3] = 255;
}
}
}
if(wheel->pixmap != NULL) {
MwLLDestroyPixmap(wheel->pixmap);
}
wheel->pixmap = MwLoadRaw(wheel->parent, data, PICKER_SIZE, PICKER_SIZE);
free(data);
MwVaApply(wheel->color_wheel_img, MwNpixmap, wheel->pixmap, NULL);
}
static void color_wheel_on_change(MwWidget handle, void* user, void* call) {
color_wheel* wheel = (color_wheel*)user;
int value = MwGetInteger(handle, MwNvalue);
int diff = MwGetInteger(handle, MwNchangedBy);
wheel->value = 1.0 - ((double)value / 1024.);
color_wheel_update(wheel);
}
void color_wheel_setup(MwWidget parent, color_wheel* wheel) {
wheel->parent = parent;
wheel->color_wheel_img = MwVaCreateWidget(MwImageClass, "image", wheel->parent, IMG_POS, IMG_POS, PICKER_SIZE, PICKER_SIZE, NULL);
wheel->pixmap = NULL;
wheel->value = 1;
color_wheel_update(wheel);
wheel->slider = MwVaCreateWidget(MwScrollBarClass, "scroll", wheel->parent, IMG_POS + PICKER_SIZE, IMG_POS, PICKER_SIZE / 32, PICKER_SIZE, MwNorientation, MwVERTICAL, MwNminValue, 0, MwNmaxValue, 1024, NULL);
MwAddUserHandler(wheel->slider, MwNchangedHandler, color_wheel_on_change, wheel);
};
int main() {
for(int h = 0; h < 255; h++) {
for(int s = 0; s < 255; s++) {
for(int v = 0; v < 255; v++) {
rgb col = hsv2rgb((hsv){
.h = h,
.s = s,
.v = v});
}
}
}
MwWidget w = MwVaCreateWidget(MwWindowClass, "main", NULL, MwDEFAULT, MwDEFAULT, WIN_SIZE, WIN_SIZE, MwNtitle, "test", NULL);
color_wheel wheel;
color_wheel_setup(w, &wheel);
MwLoop(w);
}

1
include/Mw/StringDefs.h
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@@ -14,6 +14,7 @@
#define MwNminValue "IminValue"
#define MwNmaxValue "ImaxValue"
#define MwNvalue "Ivalue"
#define MwNchangedBy "IchangedBy"
#define MwNareaShown "IareaShown"
#define MwNchecked "Ichecked"
#define MwNalignment "Ialignment"

24
src/widget/scrollbar.c
View File

@@ -132,7 +132,7 @@ static void draw(MwWidget handle) {
}
static void mouse_move(MwWidget handle) {
int or = MwGetInteger(handle, MwNorientation);
int or = MwGetInteger(handle, MwNorientation);
scrollbar_t* scr = handle->internal;
if(!handle->pressed) return;
@@ -160,31 +160,35 @@ static void mouse_move(MwWidget handle) {
}
static void mouse_down(MwWidget handle, void* ptr) {
int ww = MwGetInteger(handle, MwNwidth);
int wh = MwGetInteger(handle, MwNheight);
int or = MwGetInteger(handle, MwNorientation);
int ww = MwGetInteger(handle, MwNwidth);
int wh = MwGetInteger(handle, MwNheight);
int or = MwGetInteger(handle, MwNorientation);
scrollbar_t* scr = handle->internal;
MwLLMouse* m = ptr;
if(m->button == MwLLMouseWheelUp) {
int min = MwGetInteger(handle, MwNminValue);
int val = MwGetInteger(handle, MwNvalue);
int min = MwGetInteger(handle, MwNminValue);
int val = MwGetInteger(handle, MwNvalue);
int diff = MwGetInteger(handle, MwNareaShown);
val -= MwGetInteger(handle, MwNareaShown);
val -= diff;
if(val < min) val = min;
MwSetInteger(handle, MwNvalue, val);
MwSetInteger(handle, MwNchangedBy, -diff);
MwDispatchUserHandler(handle, MwNchangedHandler, NULL);
} else if(m->button == MwLLMouseWheelDown) {
int max = MwGetInteger(handle, MwNmaxValue);
int val = MwGetInteger(handle, MwNvalue);
int max = MwGetInteger(handle, MwNmaxValue);
int val = MwGetInteger(handle, MwNvalue);
int diff = MwGetInteger(handle, MwNareaShown);
val += MwGetInteger(handle, MwNareaShown);
val += diff;
if(val > max) val = max;
MwSetInteger(handle, MwNvalue, val);
MwSetInteger(handle, MwNchangedBy, diff);
MwDispatchUserHandler(handle, MwNchangedHandler, NULL);
}
if(m->button != MwLLMouseLeft) return;