nuclear@4: #include <stdio.h>
nuclear@4: #include "opengl.h"
nuclear@4: #include "xfer_view.h"
nuclear@4: #include "dicomview.h"
nuclear@4: 
nuclear@6: static TransferFunc *xfer;
nuclear@4: 
nuclear@4: static int act_color = 3;
nuclear@4: 
nuclear@6: bool xfview_init(TransferFunc *xferarg)
nuclear@4: {
nuclear@6: 	xfer = xferarg;
nuclear@4: 	return true;
nuclear@4: }
nuclear@4: 
nuclear@4: void xfview_destroy()
nuclear@4: {
nuclear@4: }
nuclear@4: 
nuclear@4: void xfview_draw()
nuclear@4: {
nuclear@4: 	float line_color[][3] = {
nuclear@4: 		{ 1, 0, 0 }, { 0, 1, 0 }, { 0, 0, 1 }, { 1, 1, 1 }
nuclear@4: 	};
nuclear@4: 
nuclear@4: 	glMatrixMode(GL_PROJECTION);
nuclear@4: 	glLoadIdentity();
nuclear@4: 	glMatrixMode(GL_MODELVIEW);
nuclear@4: 	glLoadIdentity();
nuclear@4: 
nuclear@4: 	int xsz, ysz;
nuclear@4: 	get_window_size(&xsz, &ysz);
nuclear@4: 	int nsamples = xsz / 4;
nuclear@4: 
nuclear@4: 	// paint the background a faint version of the selected color
nuclear@4: 	glBegin(GL_QUADS);
nuclear@4: 	glColor3f(line_color[act_color][0] * 0.1, line_color[act_color][1] * 0.1, line_color[act_color][2] * 0.1);
nuclear@4: 	glVertex2f(-1, -1);
nuclear@4: 	glVertex2f(1, -1);
nuclear@4: 	glVertex2f(1, 1);
nuclear@4: 	glVertex2f(-1, 1);
nuclear@4: 	glEnd();
nuclear@4: 
nuclear@4: 	glEnable(GL_LINE_SMOOTH);
nuclear@4: 
nuclear@4: 	glEnable(GL_BLEND);
nuclear@4: 	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
nuclear@4: 
nuclear@6: 	// draw curve
nuclear@4: 	glLineWidth(2.0);
nuclear@4: 
nuclear@4: 	for(int i=0; i<3; i++) {
nuclear@4: 		int idx;
nuclear@4: 		if(act_color < 3) {
nuclear@4: 			idx = (i + act_color + 1) % 3;
nuclear@4: 		} else {
nuclear@4: 			idx = i;
nuclear@4: 		}
nuclear@4: 
nuclear@4: 		glColor3fv(line_color[idx]);
nuclear@4: 
nuclear@4: 		glBegin(GL_LINE_STRIP);
nuclear@4: 		for(int j=0; j<nsamples; j++) {
nuclear@4: 			float t = (float)j / (float)(nsamples - 1);
nuclear@6: 			float vval[4];
nuclear@6: 			xfer->map(t, vval);
nuclear@4: 
nuclear@6: 			glVertex2f(t * 2.0 - 1.0, vval[i] * 2.0 - 1.0);
nuclear@4: 		}
nuclear@4: 		glEnd();
nuclear@4: 	}
nuclear@4: 
nuclear@4: 	glDisable(GL_BLEND);
nuclear@4: }
nuclear@4: 
nuclear@4: void xfview_button(int bn, int press, int x, int y)
nuclear@4: {
nuclear@6: 	if(bn == 2 && press) {
nuclear@4: 		act_color = (act_color + 1) % 4;
nuclear@4: 		redisplay();
nuclear@4: 		return;
nuclear@4: 	}
nuclear@4: 
nuclear@5: 	if(bn == 1) {
nuclear@5: 		if(press) {
nuclear@5: 		} else {
nuclear@5: 		}
nuclear@4: 	}
nuclear@4: }
nuclear@4: 
nuclear@4: void xfview_motion(int x, int y)
nuclear@4: {
nuclear@4: }