1 #include <stdio.h>

2 #include "opengl.h"

3 #include "xfer_view.h"

4 #include "dicomview.h"

5

6 static TransferFunc *xfer;

7

8 static int act_color = 3;

9

10 bool xfview_init(TransferFunc *xferarg)

11 {

12 xfer = xferarg;

13 return true;

14 }

15

16 void xfview_destroy()

17 {

18 }

19

20 void xfview_draw()

21 {

22 float line_color[][3] = {

23 { 1, 0, 0 }, { 0, 1, 0 }, { 0, 0, 1 }, { 1, 1, 1 }

24 };

25

26 glMatrixMode(GL_PROJECTION);

27 glLoadIdentity();

28 glMatrixMode(GL_MODELVIEW);

29 glLoadIdentity();

30

31 int xsz, ysz;

32 get_window_size(&xsz, &ysz);

33 int nsamples = xsz / 4;

34

35 // paint the background a faint version of the selected color

36 glBegin(GL_QUADS);

37 glColor3f(line_color[act_color][0] * 0.1, line_color[act_color][1] * 0.1, line_color[act_color][2] * 0.1);

38 glVertex2f(-1, -1);

39 glVertex2f(1, -1);

40 glVertex2f(1, 1);

41 glVertex2f(-1, 1);

42 glEnd();

43

44 glEnable(GL_LINE_SMOOTH);

45

46 glEnable(GL_BLEND);

47 glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

48

49 // draw curve

50 glLineWidth(2.0);

51

52 for(int i=0; i<3; i++) {

53 int idx;

54 if(act_color < 3) {

55 idx = (i + act_color + 1) % 3;

56 } else {

57 idx = i;

58 }

59

60 glColor3fv(line_color[idx]);

61

62 glBegin(GL_LINE_STRIP);

63 for(int j=0; j<nsamples; j++) {

64 float t = (float)j / (float)(nsamples - 1);

65 float vval[4];

66 xfer->map(t, vval);

67

68 glVertex2f(t * 2.0 - 1.0, vval[i] * 2.0 - 1.0);

69 }

70 glEnd();

71 }

72

73 glDisable(GL_BLEND);

74 }

75

76 void xfview_button(int bn, int press, int x, int y)

77 {

78 if(bn == 2 && press) {

79 act_color = (act_color + 1) % 4;

80 redisplay();

81 return;

82 }

83

84 if(bn == 1) {

85 if(press) {

86 } else {

87 }

88 }

89 }

90

91 void xfview_motion(int x, int y)

92 {

93 }