238 lines
6.5 KiB
C
238 lines
6.5 KiB
C
#include <GL/glfw.h>
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#include <FTGL/ftgl.h>
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#include <math.h>
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#include <stdio.h>
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#include "gauge.h"
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#include "text.h"
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void init_gauges(void)
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{
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}
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void DrawArc(float inner, float outer, float start_angle, float arc_angle, int num_segments)
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{
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num_segments = 72;
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float theta = arc_angle / (float)(num_segments - 1);//theta is now calculated from the arc angle instead, the - 1 bit comes from the fact that the arc is open
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float tangetial_factor = tanf(theta);
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float radial_factor = cosf(theta);
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float xi = inner * sinf(start_angle); //we now start at the start angle
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float yi = inner * cosf(start_angle);
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float xo = outer * sinf(start_angle); //we now start at the start angle
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float yo = outer * cosf(start_angle);
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glBegin(GL_TRIANGLE_STRIP);//since the arc is not a closed curve, this is a strip now
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int ii;
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for(ii = 0; ii < num_segments; ii++)
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{
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glVertex3f(xi, yi, 0);
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glVertex3f(xo, yo, 0);
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float txi = -yi;
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float tyi = xi;
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xi += txi * tangetial_factor;
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yi += tyi * tangetial_factor;
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xi *= radial_factor;
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yi *= radial_factor;
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float txo = -yo;
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float tyo = xo;
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xo += txo * tangetial_factor;
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yo += tyo * tangetial_factor;
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xo *= radial_factor;
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yo *= radial_factor;
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}
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glEnd();
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}
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/*
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float theta = 2 * 3.1415926 / (float)num_segments;
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float c = cosf(theta);//precalculate the sine and cosine
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float s = sinf(theta);
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float t;
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float x = r;//we start at angle = 0
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float y = 0;
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glBegin(GL_LINE_LOOP);
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int ii;
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for(ii = 0; ii < num_segments; ii++)
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{
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glVertex3f(x + cx, y + cy, 0);//output vertex
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//apply the rotation matrix
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t = x;
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x = c * x - s * y;
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y = s * t + c * y;
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}
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glEnd();
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}*/
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void drawDial(const struct gauge *gauge, float value, int style)
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{
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float range = gauge->rangemax - gauge->rangemin;
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float angle = gauge->anglemax - gauge->anglemin;
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float cura = (value - gauge->rangemin) / range * angle + gauge->anglemin;
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switch (style)
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{
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case GT_NONE:
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break;
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case GT_BAR:
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glColor4f(gauge->dial.r, gauge->dial.g, gauge->dial.b, gauge->dial.a);
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DrawArc(gauge->majorstart, gauge->majorend, cura, cura - gauge->anglemin, 10);
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break;
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case GT_LINE2:
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glColor4f(gauge->dial.r, gauge->dial.g, gauge->dial.b, gauge->dial.a);
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glBegin(GL_LINES);
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glVertex3f(0, 0, 0);
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glVertex3f(sin(cura), cos(cura), 0);
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glEnd();
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break;
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case GT_LINE:
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glColor4f(1.0, 0.0, 0.0, 1.0);
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glBegin(GL_LINES);
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glVertex3f(sin(cura) * 0.8, cos(cura) * 0.8, 0);
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glVertex3f(sin(cura), cos(cura), 0);
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glEnd();
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break;
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default:
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case GT_NEEDLE:
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glColor4f(gauge->dial.r, gauge->dial.g, gauge->dial.b, gauge->dial.a);
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glRotatef(cura * -180.0 / M_PI, 0.0, 0.0, 1.0);
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glBegin(GL_TRIANGLE_STRIP);
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//glVertex3f(-0.01, -0.04, 0.0);
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//glVertex3f(0.01, -0.04, 0.0);
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//glVertex3f(-0.02, 0, 0.0);
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//glVertex3f(0.02, 0.0, 0.0);
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//glVertex3f(-0.005, 1.0, 0.0);
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//glVertex3f(0.005, 1.0, 0.0);
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glVertex3f(-0.02, 0.2, 0.0);
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glVertex3f(0.02, 0.2, 0.0);
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glVertex3f(-0.005, 1.0, 0.0);
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glVertex3f(0.005, 1.0, 0.0);
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//glVertex3f(0.0, 1.0, 0.0);
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glEnd();
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break;
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}
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}
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void draw_gauge(const struct gauge *gauge, float value, float red, FTGLfont *font, int gaugetype)
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{
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float range = gauge->rangemax - gauge->rangemin;
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float angle = gauge->anglemax - gauge->anglemin;
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float major;// = angle / (range / gauge->majorstep + 0.0);
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float minor;// = angle / (range / gauge->minorstep + 0.0);
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float cura;
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float x1, y1, x2, y2;
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int ii;
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float majorstep = gauge->majorstep;
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float minorstep = gauge->minorstep;
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while (1) {
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major = angle / (range / majorstep + 0.0);
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minor = angle / (range / minorstep + 0.0);
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if (fabsf(major) < 12 * M_PI / 180.0) {
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majorstep *= 2;
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minorstep = majorstep / 2;
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} else {
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break;
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}
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}
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if (value < gauge->rangemin) value = gauge->rangemin;
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if (value > gauge->rangemax * 2) value = gauge->rangemax * 2;
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glPushMatrix();
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glScalef(gauge->radius, gauge->radius, 1.0);
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if (red > 0) {
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glLineWidth(1.0);
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glColor4f(0.8, 0.0, 0.0, 1.0);
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cura = (red - gauge->rangemin) / range * angle + gauge->anglemin;
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/*
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float x1 = sin(cura) * gauge->majorstart;
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float y1 = cos(cura) * gauge->majorstart;
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float x2 = sin(cura) * gauge->majorend;
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float y2 = cos(cura) * gauge->majorend;
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glBegin(GL_LINES);
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glVertex3f(x1, y1, 0);
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glVertex3f(x2, y2, 0);
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glEnd();*/
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// printf("%f -> %f\n", cura, gauge->anglemax);
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DrawArc(gauge->majorstart, gauge->majorend, gauge->anglemax, gauge->anglemax - cura, 10);
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}
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glLineWidth(gauge->minorwidth);
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glColor4f(gauge->minor.r, gauge->minor.g, gauge->minor.b, gauge->minor.a);
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// for (cura = gauge->anglemin; cura < gauge->anglemax; cura += minor)
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for (ii = 0; ii <= range / minorstep; ii++)
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{
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if (red > 0 && ii * minorstep >= red) {
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glColor4f(1.0, 1.0, 1.0, 1.0);
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}
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float cura = gauge->anglemin + ii * minor;
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x1 = sin(cura) * gauge->minorstart;
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y1 = cos(cura) * gauge->minorstart;
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x2 = sin(cura) * gauge->minorend;
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y2 = cos(cura) * gauge->minorend;
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glBegin(GL_LINES);
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glVertex3f(x1, y1, 0);
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glVertex3f(x2, y2, 0);
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glEnd();
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}
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glLineWidth(gauge->majorwidth);
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glColor4f(gauge->major.r, gauge->major.g, gauge->major.b, gauge->major.a);
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// for (cura = gauge->anglemin; cura < gauge->anglemax; cura += major)
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for (ii = 0; ii <= range / majorstep; ii++)
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{
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if (red > 0 && ii * majorstep > red) {
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glColor4f(1.0, 1.0, 1.0, 1.0);
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}
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float cura = gauge->anglemin + ii * major;
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x1 = sin(cura) * gauge->majorstart;
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y1 = cos(cura) * gauge->majorstart;
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x2 = sin(cura) * gauge->majorend;
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y2 = cos(cura) * gauge->majorend;
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glBegin(GL_LINES);
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glVertex3f(x1, y1, 0);
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glVertex3f(x2, y2, 0);
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glEnd();
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char text[10];
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if (gauge->majorstep > 100) {
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snprintf(text, sizeof text, "%d", (int)(ii * majorstep / 1000 + gauge->rangemin));
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} else {
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if (range == 1) {
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snprintf(text, sizeof text, ii == 0 ? "E" : ii == 1 ? "½" : "F");
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} else {
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snprintf(text, sizeof text, "%d", (int)(ii * majorstep + gauge->rangemin));
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}
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}
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float scale = (gauge->majorend - gauge->majorstart) * 1.5;
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float offs = gauge->majorstart - scale;
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drawText(text, font, sin(cura) * offs, cos(cura) * offs, scale, scale, TA_CENTRE, TA_CENTRE);
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}
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drawDial(gauge, value, gaugetype);
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glPopMatrix();
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}
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