1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/xfer_view.cc	Mon Dec 29 05:41:36 2014 +0200
     1.3 @@ -0,0 +1,124 @@
     1.4 +#include <stdio.h>
     1.5 +#include "opengl.h"
     1.6 +#include "xfer_view.h"
     1.7 +#include "dicomview.h"
     1.8 +
     1.9 +static Renderer *rend;
    1.10 +
    1.11 +static int act_color = 3;
    1.12 +static CurvePoint *cpsel[3];
    1.13 +
    1.14 +bool xfview_init(Renderer *rendarg)
    1.15 +{
    1.16 +	rend = rendarg;
    1.17 +	return true;
    1.18 +}
    1.19 +
    1.20 +void xfview_destroy()
    1.21 +{
    1.22 +}
    1.23 +
    1.24 +void xfview_draw()
    1.25 +{
    1.26 +	float line_color[][3] = {
    1.27 +		{ 1, 0, 0 }, { 0, 1, 0 }, { 0, 0, 1 }, { 1, 1, 1 }
    1.28 +	};
    1.29 +
    1.30 +	glMatrixMode(GL_PROJECTION);
    1.31 +	glLoadIdentity();
    1.32 +	glMatrixMode(GL_MODELVIEW);
    1.33 +	glLoadIdentity();
    1.34 +
    1.35 +	int xsz, ysz;
    1.36 +	get_window_size(&xsz, &ysz);
    1.37 +	int nsamples = xsz / 4;
    1.38 +
    1.39 +	// paint the background a faint version of the selected color
    1.40 +	glBegin(GL_QUADS);
    1.41 +	glColor3f(line_color[act_color][0] * 0.1, line_color[act_color][1] * 0.1, line_color[act_color][2] * 0.1);
    1.42 +	glVertex2f(-1, -1);
    1.43 +	glVertex2f(1, -1);
    1.44 +	glVertex2f(1, 1);
    1.45 +	glVertex2f(-1, 1);
    1.46 +	glEnd();
    1.47 +
    1.48 +	glEnable(GL_POINT_SMOOTH);
    1.49 +	glEnable(GL_LINE_SMOOTH);
    1.50 +
    1.51 +	glEnable(GL_BLEND);
    1.52 +	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    1.53 +
    1.54 +	// draw selection outline
    1.55 +	if(act_color < 3) {
    1.56 +		glPointSize(13.0);
    1.57 +		glLineWidth(5.0);
    1.58 +
    1.59 +		const Curve &sel_curve = rend->transfer_curve(act_color);
    1.60 +		glColor3f(0.7, 0.7, 0.7);
    1.61 +		glBegin(GL_LINE_STRIP);
    1.62 +		for(int i=0; i<nsamples; i++) {
    1.63 +			float t = (float)i / (float)(nsamples - 1);
    1.64 +			float val = sel_curve.value(t);
    1.65 +			glVertex2f(t * 2.0 - 1.0, val * 2.0 - 1.0);
    1.66 +		}
    1.67 +		glEnd();
    1.68 +		glBegin(GL_POINTS);
    1.69 +		for(int i=0; i<sel_curve.get_num_points(); i++) {
    1.70 +			const CurvePoint *p = sel_curve.get_point(i);
    1.71 +			float x = 2.0 * (float)p->t_int / 65535.0 - 1.0;
    1.72 +			glVertex2f(x, p->value * 2.0 - 1.0);
    1.73 +		}
    1.74 +		glEnd();
    1.75 +	}
    1.76 +
    1.77 +
    1.78 +	// draw curves and points
    1.79 +	glPointSize(9.0);
    1.80 +	glLineWidth(2.0);
    1.81 +
    1.82 +	for(int i=0; i<3; i++) {
    1.83 +		int idx;
    1.84 +		if(act_color < 3) {
    1.85 +			idx = (i + act_color + 1) % 3;
    1.86 +		} else {
    1.87 +			idx = i;
    1.88 +		}
    1.89 +
    1.90 +		const Curve &xfer = rend->transfer_curve(idx);
    1.91 +		glColor3fv(line_color[idx]);
    1.92 +
    1.93 +		glBegin(GL_LINE_STRIP);
    1.94 +		for(int j=0; j<nsamples; j++) {
    1.95 +			float t = (float)j / (float)(nsamples - 1);
    1.96 +			float val = xfer.value(t);
    1.97 +			glVertex2f(t * 2.0 - 1.0, val * 2.0 - 1.0);
    1.98 +		}
    1.99 +		glEnd();
   1.100 +
   1.101 +		glBegin(GL_POINTS);
   1.102 +		for(int j=0; j<xfer.get_num_points(); j++) {
   1.103 +			const CurvePoint *p = xfer.get_point(j);
   1.104 +			float x = 2.0 * (float)p->t_int / 65535.0 - 1.0;
   1.105 +			glVertex2f(x, p->value * 2.0 - 1.0);
   1.106 +		}
   1.107 +		glEnd();
   1.108 +	}
   1.109 +
   1.110 +	glDisable(GL_BLEND);
   1.111 +}
   1.112 +
   1.113 +void xfview_button(int bn, int press, int x, int y)
   1.114 +{
   1.115 +	if(bn == 2 && press) {
   1.116 +		act_color = (act_color + 1) % 4;
   1.117 +		redisplay();
   1.118 +		return;
   1.119 +	}
   1.120 +
   1.121 +	if(press) {
   1.122 +	}
   1.123 +}
   1.124 +
   1.125 +void xfview_motion(int x, int y)
   1.126 +{
   1.127 +}