- added libdrawtext

[demo_prior] / src / imtk / slider.c

diff --git a/src/imtk/slider.c b/src/imtk/slider.c
new file mode 100644 (file)
index 0000000..6c50d03
--- /dev/null
+++ b/src/imtk/slider.c
@@ -0,0 +1,110 @@
+#include <stdio.h>
+#include <string.h>
+#include <assert.h>
+#include "imtk.h"
+#include "state.h"
+#include "draw.h"
+
+#define SLIDER_SIZE            100
+#define THUMB_WIDTH            10
+#define THUMB_HEIGHT   20
+
+static int draw_slider(int id, float pos, float min, float max, int x, int y, int over);
+
+float imtk_slider(int id, float pos, float min, float max, int x, int y)
+{
+       int mousex, mousey, thumb_x, thumb_y, txsz, over = 0;
+       float range = max - min;
+
+       assert(id >= 0);
+
+       if(x == IMTK_AUTO || y == IMTK_AUTO) {
+               imtk_layout_get_pos(&x, &y);
+       }
+       y += THUMB_HEIGHT / 2;
+
+       imtk_get_mouse(&mousex, &mousey);
+
+       pos = (pos - min) / range;
+       if(pos < 0.0) pos = 0.0;
+       if(pos > 1.0) pos = 1.0;
+
+       thumb_x = x + SLIDER_SIZE * pos - THUMB_WIDTH / 2;
+       thumb_y = y - THUMB_HEIGHT / 2;
+
+       if(imtk_hit_test(thumb_x, thumb_y, THUMB_WIDTH, THUMB_HEIGHT)) {
+               imtk_set_hot(id);
+               over = 1;
+       }
+
+       if(imtk_button_state(IMTK_LEFT_BUTTON)) {
+               if(over && imtk_is_hot(id)) {
+                       if(!imtk_is_active(id)) {
+                               imtk_set_prev_mouse(mousex, mousey);
+                       }
+                       imtk_set_active(id);
+               }
+       } else {
+               if(imtk_is_active(id)) {
+                       imtk_set_active(-1);
+               }
+       }
+
+       if(imtk_is_active(id)) {
+               int prevx;
+               float dx;
+
+               imtk_get_prev_mouse(&prevx, 0);
+
+               dx = (float)(mousex - prevx) / (float)SLIDER_SIZE;
+               pos += dx;
+               imtk_set_prev_mouse(mousex, mousey);
+
+               if(pos < 0.0) pos = 0.0;
+               if(pos > 1.0) pos = 1.0;
+       }
+
+       txsz = draw_slider(id, pos, min, max, x, y, over);
+       imtk_layout_advance(SLIDER_SIZE + THUMB_WIDTH + txsz, THUMB_HEIGHT);
+       return pos * range + min;
+}
+
+
+static int draw_slider(int id, float pos, float min, float max, int x, int y, int over)
+{
+       float range = max - min;
+       int thumb_x, thumb_y;
+       char buf[32];
+       float tcol[4], bcol[4];
+       unsigned int attr = 0;
+
+       thumb_x = x + SLIDER_SIZE * pos - THUMB_WIDTH / 2;
+       thumb_y = y - THUMB_HEIGHT / 2;
+
+       memcpy(tcol, imtk_get_color(IMTK_BOTTOM_COLOR), sizeof tcol);
+       memcpy(bcol, imtk_get_color(IMTK_TOP_COLOR), sizeof bcol);
+
+       /* draw trough */
+       imtk_draw_rect(x, y - 2, SLIDER_SIZE, 5, tcol, bcol);
+       imtk_draw_frame(x, y - 2, SLIDER_SIZE, 5, FRAME_INSET);
+
+       if(over) {
+               attr |= IMTK_FOCUS_BIT;
+       }
+       if(imtk_is_active(id)) {
+               attr |= IMTK_PRESS_BIT;
+       }
+       memcpy(tcol, imtk_get_color(IMTK_TOP_COLOR | attr), sizeof tcol);
+       memcpy(bcol, imtk_get_color(IMTK_BOTTOM_COLOR | attr), sizeof bcol);
+
+       /* draw handle */
+       imtk_draw_rect(thumb_x, thumb_y, THUMB_WIDTH, THUMB_HEIGHT, tcol, bcol);
+       imtk_draw_frame(thumb_x, thumb_y, THUMB_WIDTH, THUMB_HEIGHT, FRAME_OUTSET);
+
+       /* draw display */
+       sprintf(buf, "%.3f", pos * range + min);
+       glColor4fv(imtk_get_color(IMTK_TEXT_COLOR));
+       imtk_draw_string(x + SLIDER_SIZE + THUMB_WIDTH / 2 + 2, y + 4, buf);
+       return imtk_string_size(buf);
+}
+