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|
/*
* gldgDraw.c
*
* OpenGL Graph Display primitive drawing module implementation
*
* Written by: Shawn Taras
*/
#include <stdlib.h>
#include <math.h>
#include <GL/gl.h>
#include "glgd.h"
/*
* Defines
*/
#define GLGDDRAW_BW1 (4.0f)
#define GLGDDRAW_BW2 (2.0f)
/*
* Global variables
*/
glgdColor g_colorBlack = {0.0, 0.0, 0.0, 1.0};
glgdColor g_colorWhite = {1.0, 1.0, 1.0, 1.0};
glgdColor g_colorRed = {1.0, 0.0, 0.0, 1.0};
glgdColor g_colorGreen = {0.0, 1.0, 0.0, 1.0};
glgdColor g_colorBlue = {0.0, 0.0, 1.0, 1.0};
glgdColor g_colorYellow = {1.0, 1.0, 0.0, 1.0};
glgdColor g_colorCyan = {0.0, 1.0, 1.0, 1.0};
glgdColor g_colorMagenta = {1.0, 0.0, 1.0, 1.0};
/*
* Static local (to this module) variables
*/
static glgdColor s_colorBlack = {0.0, 0.0, 0.0, 1.0};
static GLdouble s_zValue = 0.0f;
static GLdouble s_lineWidth = 1.0f;
static GLint s_blendFunc[2] = {GL_ONE, GL_ZERO};
/*
* Static local (to this module) functions
*/
static void
glgdPushAttributes(void)
{
glPushAttrib(GL_ENABLE_BIT | GL_HINT_BIT | GL_LINE_BIT);
glGetIntegerv(GL_BLEND_SRC, &s_blendFunc[0]);
glGetIntegerv(GL_BLEND_DST, &s_blendFunc[1]);
/* Common attributes for primitive drawing */
glDisable(GL_TEXTURE_2D);
glDisable(GL_LIGHTING);
glDisable(GL_DEPTH_TEST);
glLineWidth((GLfloat)s_lineWidth);
}
static void
glgdPopAttributes(void)
{
glPopAttrib();
glBlendFunc(s_blendFunc[0], s_blendFunc[1]);
}
static void
glgdDrawColorSet(glgdColor col, GLboolean isLine)
{
if (isLine)
{
glEnable(GL_LINE_SMOOTH);
glHint(GL_LINE_SMOOTH_HINT, GL_NICEST);
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glColor4d(col[0], col[1], col[2], col[3]);
}
else if (col[3] < 1.0)
{
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glColor4d(col[0], col[1], col[2], col[3]);
}
else
{
glDisable(GL_BLEND);
glColor3d(col[0], col[1], col[2]);
}
}
static GLdouble
glgdDrawLERP
(
GLdouble val,
GLdouble smin,
GLdouble smax,
GLdouble gmin,
GLdouble gmax
)
{
if (smin == smax)
{
return gmax;
}
else
{
return gmin + (gmax - gmin) * (val - smin) / (smax - smin);
}
}
/*
* External public functions
*/
void
glgdDrawZValueSet(GLdouble zValue)
{
s_zValue = zValue;
}
void
glgdDrawZValueGet(GLdouble *zValue)
{
if (zValue)
{
*zValue = s_zValue;
}
}
void
glgdDrawLineWidthSet(GLdouble lineWidth)
{
s_lineWidth = lineWidth;
}
void
glgdDrawLineWidthGet(GLdouble *lineWidth)
{
if (lineWidth)
{
*lineWidth = s_lineWidth;
}
}
void
glgdDrawLine(glgdVec2 xy, glgdVec2 wh, glgdColor col)
{
GLdouble x1, y1;
GLdouble x2, y2;
x1 = xy[0];
y1 = xy[1];
x2 = x1 + wh[0] - 1.0f;
y2 = y1 + wh[1] - 1.0f;
glgdDrawColorSet(col, GL_TRUE);
glBegin(GL_LINE_STRIP);
glVertex3d(x1, y1, s_zValue);
glVertex3d(x2, y2, s_zValue);
glEnd();
}
void
glgdDrawRect(glgdVec2 xy, glgdVec2 wh, glgdColor col)
{
GLdouble x1, y1;
GLdouble x2, y2;
x1 = xy[0];
y1 = xy[1];
x2 = x1 + wh[0];
y2 = y1 + wh[1];
glgdDrawColorSet(col, GL_FALSE);
glBegin(GL_TRIANGLE_STRIP);
glVertex3d(x1, y1, s_zValue);
glVertex3d(x1, y2, s_zValue);
glVertex3d(x2, y1, s_zValue);
glVertex3d(x2, y2, s_zValue);
glEnd();
}
void
glgdDrawBoundary(glgdVec2 xy, glgdVec2 wh, glgdColor col)
{
GLdouble x1, y1;
GLdouble x2, y2;
x1 = xy[0];
y1 = xy[1];
x2 = x1 + wh[0] - 1.0f;
y2 = y1 + wh[1] - 1.0f;
glgdDrawColorSet(col, GL_TRUE);
glBegin(GL_LINE_LOOP);
glVertex3d(x1, y1, s_zValue);
glVertex3d(x2, y1, s_zValue);
glVertex3d(x2, y2, s_zValue);
glVertex3d(x1, y2, s_zValue);
glEnd();
}
void
glgdDrawRectBoundary(glgdVec2 xy, glgdVec2 wh, glgdColor col)
{
GLdouble x1, y1;
GLdouble x2, y2;
x1 = xy[0];
y1 = xy[1];
x2 = x1 + wh[0] - 1.0f;
y2 = y1 + wh[1];
/* Draw the rectangle */
glgdDrawColorSet(col, GL_FALSE);
glBegin(GL_TRIANGLE_STRIP);
glVertex3d(x1 + 1.0f, y1, s_zValue);
glVertex3d(x1 + 1.0f, y2, s_zValue);
glVertex3d(x2, y1, s_zValue);
glVertex3d(x2, y2, s_zValue);
glEnd();
/* Draw the boundary */
glgdDrawColorSet(s_colorBlack, GL_TRUE);
glBegin(GL_LINE_LOOP);
glVertex3d(x1, y1, s_zValue);
glVertex3d(x2, y1, s_zValue);
glVertex3d(x2, y2, s_zValue);
glVertex3d(x1, y2, s_zValue);
glEnd();
}
void
glgdDrawQuad
(
glgdVec2 a,
glgdVec2 b,
glgdVec2 c,
glgdVec2 d,
glgdColor col
)
{
glgdDrawColorSet(col, GL_FALSE);
glBegin(GL_TRIANGLE_STRIP);
glVertex3d(a[0], a[1], s_zValue);
glVertex3d(b[0], b[1], s_zValue);
glVertex3d(d[0], d[1], s_zValue);
glVertex3d(c[0], c[1], s_zValue);
glEnd();
}
void
glgdDrawQuadBoundary
(
glgdVec2 a,
glgdVec2 b,
glgdVec2 c,
glgdVec2 d,
glgdColor col
)
{
glgdDrawQuad(a, b, c, d, col);
/* Draw the boundary */
glgdDrawColorSet(s_colorBlack, GL_TRUE);
glBegin(GL_LINE_LOOP);
glVertex3d(a[0], a[1], s_zValue);
glVertex3d(b[0], b[1], s_zValue);
glVertex3d(c[0], c[1], s_zValue);
glVertex3d(d[0], d[1], s_zValue);
glEnd();
}
void
glgdDrawBox
(
glgdDrawBoxType boxType,
glgdVec2 xy,
glgdVec2 wh,
glgdColor col,
GLdouble borderWidth
)
{
GLdouble borderHeight;
glgdVec2 tmpXY;
glgdVec2 tmpWH;
glgdVec2 qxy[4];
glgdColor tmpCol;
if (boxType == GLGDDRAW_BOXTYPE_NONE)
{
return;
}
borderHeight = borderWidth;
glgdPushAttributes();
switch (boxType)
{
case GLGDDRAW_BOXTYPE_UP:
tmpXY[0] = xy[0] + borderWidth;
tmpXY[1] = xy[1] + borderHeight;
tmpWH[0] = wh[0] - 2.0f * borderWidth - 1.0f;
tmpWH[1] = wh[1] - 2.0f * borderHeight - 1.0f;
glgdDrawRect(tmpXY, tmpWH, col);
tmpCol[0] = GLGDDRAW_COLORCLAMP(col[0] * GLGDDRAW_DARKEN);
tmpCol[1] = GLGDDRAW_COLORCLAMP(col[1] * GLGDDRAW_DARKEN);
tmpCol[2] = GLGDDRAW_COLORCLAMP(col[2] * GLGDDRAW_DARKEN);
tmpCol[3] = col[3];
tmpXY[0] = xy[0];
tmpXY[1] = xy[1];
tmpWH[0] = wh[0] - 1.0f;
tmpWH[1] = borderHeight;
glgdDrawRect(tmpXY, tmpWH, tmpCol);
tmpCol[0] = GLGDDRAW_COLORCLAMP(col[0] * GLGDDRAW_LIGHTEN);
tmpCol[1] = GLGDDRAW_COLORCLAMP(col[1] * GLGDDRAW_LIGHTEN);
tmpCol[2] = GLGDDRAW_COLORCLAMP(col[2] * GLGDDRAW_LIGHTEN);
tmpCol[3] = col[3];
tmpXY[0] = xy[0];
tmpXY[1] = xy[1] + wh[1] - borderHeight - 1.0f;
tmpWH[0] = wh[0] - 1.0f;
tmpWH[1] = borderHeight;
glgdDrawRect(tmpXY, tmpWH, tmpCol);
tmpCol[0] = GLGDDRAW_COLORCLAMP(col[0] * GLGDDRAW_DARKEN);
tmpCol[1] = GLGDDRAW_COLORCLAMP(col[1] * GLGDDRAW_DARKEN);
tmpCol[2] = GLGDDRAW_COLORCLAMP(col[2] * GLGDDRAW_DARKEN);
tmpCol[3] = col[3];
qxy[0][0] = xy[0];
qxy[0][1] = xy[1];
qxy[1][0] = xy[0];
qxy[1][1] = xy[1] + wh[1] - 1.0f;
qxy[2][0] = xy[0] + borderWidth;
qxy[2][1] = xy[1] + wh[1] - borderHeight - 1.0f;
qxy[3][0] = xy[0] + borderWidth;
qxy[3][1] = xy[1] + borderHeight;
glgdDrawQuad(qxy[0], qxy[1], qxy[2], qxy[3], tmpCol);
tmpCol[0] = GLGDDRAW_COLORCLAMP(col[0] * GLGDDRAW_LIGHTEN);
tmpCol[1] = GLGDDRAW_COLORCLAMP(col[1] * GLGDDRAW_LIGHTEN);
tmpCol[2] = GLGDDRAW_COLORCLAMP(col[2] * GLGDDRAW_LIGHTEN);
qxy[0][0] = xy[0] + wh[0] - borderWidth - 1.0f;
qxy[0][1] = xy[1] + borderHeight;
qxy[1][0] = xy[0] + wh[0] - borderWidth - 1.0f;
qxy[1][1] = xy[1] + wh[1] - borderHeight - 1.0f;
qxy[2][0] = xy[0] + wh[0] - 1.0f;
qxy[2][1] = xy[1] + wh[1] - 1.0f;
qxy[3][0] = xy[0] + wh[0] - 1.0f;
qxy[3][1] = xy[1];
glgdDrawQuad(qxy[0], qxy[1], qxy[2], qxy[3], tmpCol);
glgdDrawBoundary(xy, wh, col);
break;
case GLGDDRAW_BOXTYPE_DOWN:
tmpXY[0] = xy[0] + borderWidth + 1.0f;
tmpXY[1] = xy[1] + borderHeight + 1.0f;
tmpWH[0] = wh[0] - 2.0f * borderWidth - 2.0f;
tmpWH[1] = wh[1] - 2.0f * borderHeight - 1.0f;
glgdDrawRectBoundary(tmpXY, tmpWH, col);
tmpCol[0] = GLGDDRAW_COLORCLAMP(col[0] * GLGDDRAW_DARKEN);
tmpCol[1] = GLGDDRAW_COLORCLAMP(col[1] * GLGDDRAW_DARKEN);
tmpCol[2] = GLGDDRAW_COLORCLAMP(col[2] * GLGDDRAW_DARKEN);
tmpCol[3] = col[3];
tmpXY[0] = xy[0];
tmpXY[1] = xy[1];
tmpWH[0] = wh[0];
tmpWH[1] = borderHeight;
glgdDrawRect(tmpXY, tmpWH, tmpCol);
tmpCol[0] = GLGDDRAW_COLORCLAMP(col[0] * GLGDDRAW_LIGHTEN);
tmpCol[1] = GLGDDRAW_COLORCLAMP(col[1] * GLGDDRAW_LIGHTEN);
tmpCol[2] = GLGDDRAW_COLORCLAMP(col[2] * GLGDDRAW_LIGHTEN);
tmpCol[3] = col[3];
tmpXY[0] = xy[0];
tmpXY[1] = xy[1] + wh[1] - borderHeight;
tmpWH[0] = wh[0];
tmpWH[1] = borderHeight;
glgdDrawRect(tmpXY, tmpWH, tmpCol);
tmpCol[0] = GLGDDRAW_COLORCLAMP(col[0] * GLGDDRAW_DARKEN);
tmpCol[1] = GLGDDRAW_COLORCLAMP(col[1] * GLGDDRAW_DARKEN);
tmpCol[2] = GLGDDRAW_COLORCLAMP(col[2] * GLGDDRAW_DARKEN);
tmpCol[3] = col[3];
qxy[0][0] = xy[0];
qxy[0][1] = xy[1];
qxy[1][0] = xy[0];
qxy[1][1] = xy[1] + wh[1];
qxy[2][0] = xy[0] + borderWidth;
qxy[2][1] = xy[1] + wh[1] - borderHeight;
qxy[3][0] = xy[0] + borderWidth;
qxy[3][1] = xy[1] + borderHeight;
glgdDrawQuad(qxy[0], qxy[1], qxy[2], qxy[3], tmpCol);
tmpCol[0] = GLGDDRAW_COLORCLAMP(col[0] * GLGDDRAW_LIGHTEN);
tmpCol[1] = GLGDDRAW_COLORCLAMP(col[1] * GLGDDRAW_LIGHTEN);
tmpCol[2] = GLGDDRAW_COLORCLAMP(col[2] * GLGDDRAW_LIGHTEN);
qxy[0][0] = xy[0] + wh[0] - borderWidth;
qxy[0][1] = xy[1] + borderHeight;
qxy[1][0] = xy[0] + wh[0] - borderWidth;
qxy[1][1] = xy[1] + wh[1] - borderHeight;
qxy[2][0] = xy[0] + wh[0];
qxy[2][1] = xy[1] + wh[1];
qxy[3][0] = xy[0] + wh[0];
qxy[3][1] = xy[1];
glgdDrawQuad(qxy[0], qxy[1], qxy[2], qxy[3], tmpCol);
break;
case GLGDDRAW_BOXTYPE_FLAT:
glgdDrawRect(xy, wh, col);
break;
case GLGDDRAW_BOXTYPE_BORDER:
glgdDrawRectBoundary(xy, wh, col);
break;
case GLGDDRAW_BOXTYPE_SHADOW:
/* The Shadow */
tmpCol[0] = GLGDDRAW_COLORCLAMP(col[0] * GLGDDRAW_DARKEN);
tmpCol[1] = GLGDDRAW_COLORCLAMP(col[1] * GLGDDRAW_DARKEN);
tmpCol[2] = GLGDDRAW_COLORCLAMP(col[2] * GLGDDRAW_DARKEN);
tmpCol[3] = col[3];
tmpXY[0] = xy[0] + borderWidth;
tmpXY[1] = xy[1] + wh[1];
tmpWH[0] = wh[0];
tmpWH[1] = borderHeight;
glgdDrawRect(tmpXY, tmpWH, tmpCol);
tmpXY[0] = xy[0] + wh[0];
tmpXY[1] = xy[1] + borderHeight;
tmpWH[0] = borderWidth;
tmpWH[1] = wh[1];
glgdDrawRect(tmpXY, tmpWH, tmpCol);
/* The box */
glgdDrawRectBoundary(xy, wh, col);
break;
case GLGDDRAW_BOXTYPE_FRAME:
glgdDrawRect(xy, wh, col);
tmpCol[0] = GLGDDRAW_COLORCLAMP(col[0] * GLGDDRAW_DARKEN);
tmpCol[1] = GLGDDRAW_COLORCLAMP(col[1] * GLGDDRAW_DARKEN);
tmpCol[2] = GLGDDRAW_COLORCLAMP(col[2] * GLGDDRAW_DARKEN);
tmpCol[3] = col[3];
tmpXY[0] = xy[0];
tmpXY[1] = xy[1];
tmpWH[0] = wh[0] - 2.0f;
tmpWH[1] = wh[1] - 2.0f;
glgdDrawBoundary(tmpXY, tmpWH, tmpCol);
tmpCol[0] = GLGDDRAW_COLORCLAMP(col[0] * GLGDDRAW_LIGHTEN);
tmpCol[1] = GLGDDRAW_COLORCLAMP(col[1] * GLGDDRAW_LIGHTEN);
tmpCol[2] = GLGDDRAW_COLORCLAMP(col[2] * GLGDDRAW_LIGHTEN);
tmpCol[3] = col[3];
tmpXY[0] = xy[0] + 2.0f;
tmpXY[1] = xy[1] + 2.0f;
tmpWH[0] = wh[0] - 2.0f;
tmpWH[1] = wh[1] - 2.0f;
glgdDrawBoundary(tmpXY, tmpWH, tmpCol);
break;
default:
break;
}
glgdPopAttributes();
}
void
glgdDrawSlider
(
glgdDrawBoxType boxType,
glgdDrawSliderType sliderType,
glgdVec2 xy,
glgdVec2 wh,
glgdColor col1,
glgdColor col2,
GLdouble size,
GLdouble val
)
{
GLdouble xsl, ysl, wsl, hsl;
glgdDrawBoxType slBoxType;
glgdVec2 pos, dim;
glgdPushAttributes();
switch (sliderType)
{
case GLGDDRAW_SLIDERTYPE_VERT:
case GLGDDRAW_SLIDERTYPE_VERT_NICE:
hsl = size * (wh[1] - 2.0f * GLGDDRAW_BW1);
ysl = glgdDrawLERP(1.0f - val, 0.0f, 1.0f, xy[1] + GLGDDRAW_BW1, xy[1] + wh[1] - GLGDDRAW_BW1 - hsl);
wsl = wh[0] - 2.0f * GLGDDRAW_BW1;
xsl = xy[0] + GLGDDRAW_BW1;
break;
case GLGDDRAW_SLIDERTYPE_HORIZ:
case GLGDDRAW_SLIDERTYPE_HORIZ_NICE:
wsl = size * (wh[0] - 2.0f * GLGDDRAW_BW1);
xsl = glgdDrawLERP(val, 0.0f, 1.0f, xy[0] + GLGDDRAW_BW1, xy[0] + wh[0] - GLGDDRAW_BW1 - wsl);
hsl = wh[1] - 2.0f * GLGDDRAW_BW1;
ysl = xy[1] + GLGDDRAW_BW1;
break;
case GLGDDRAW_SLIDERTYPE_VERT_FILL:
hsl = val * (wh[1] - 2.0f * GLGDDRAW_BW1);
ysl = xy[1] + GLGDDRAW_BW1 + (1.0f - val) * (wh[1] - 2.0f * GLGDDRAW_BW1);
wsl = wh[0] - 2.0f * GLGDDRAW_BW1;
xsl = xy[0] + GLGDDRAW_BW1;
break;
case GLGDDRAW_SLIDERTYPE_HORIZ_FILL:
wsl = val * (wh[0] - 2.0f * GLGDDRAW_BW1);
xsl = xy[0] + GLGDDRAW_BW1;
hsl = wh[1] - 2.0f * GLGDDRAW_BW1;
ysl = xy[1] + GLGDDRAW_BW1;
break;
default:
return;
}
/* Draw the slider */
glgdDrawBox(boxType, xy, wh, col1, GLGDDRAW_BW1);
if (sliderType == GLGDDRAW_SLIDERTYPE_VERT_NICE)
{
pos[0] = xy[0] + wh[0] / 2.0f - 1.0f;
pos[1] = xy[1] + GLGDDRAW_BW1;
dim[0] = 2.0f;
dim[1] = wh[1] - 2.0f * GLGDDRAW_BW1;
glgdDrawBox(GLGDDRAW_BOXTYPE_FLAT, pos, dim, s_colorBlack, 0.0f);
pos[0] = xsl;
pos[1] = ysl;
dim[0] = wsl;
dim[1] = hsl;
glgdDrawBox(GLGDDRAW_BOXTYPE_UP, pos, dim, col1, GLGDDRAW_BW1);
pos[0] = xsl + 2.0f;
pos[1] = ysl + hsl / 2.0f - 2.0f;
dim[0] = wsl - 2.0f;
dim[1] = 4.0f;
glgdDrawBox(GLGDDRAW_BOXTYPE_DOWN, pos, dim, col2, 1.0f);
}
else if (sliderType == GLGDDRAW_SLIDERTYPE_HORIZ_NICE)
{
pos[0] = xy[0] + GLGDDRAW_BW1;
pos[1] = xy[1] + wh[1] / 2.0f - 1.0f;
dim[0] = wh[0] - 2.0f * GLGDDRAW_BW1;
dim[1] = 2.0f;
glgdDrawBox(GLGDDRAW_BOXTYPE_FLAT, pos, dim, s_colorBlack, 0.0f);
pos[0] = xsl;
pos[1] = ysl;
dim[0] = wsl;
dim[1] = hsl;
glgdDrawBox(GLGDDRAW_BOXTYPE_UP, pos, dim, col1, GLGDDRAW_BW1);
pos[0] = xsl + wsl / 2.0f - 2.0f;
pos[1] = ysl + 1.0f;
dim[0] = 4.0f;
dim[1] = hsl - 2.0f;
glgdDrawBox(GLGDDRAW_BOXTYPE_DOWN, pos, dim, col2, 1.0f);
}
else
{
switch (boxType)
{
case GLGDDRAW_BOXTYPE_UP:
case GLGDDRAW_BOXTYPE_DOWN:
slBoxType = GLGDDRAW_BOXTYPE_UP;
break;
case GLGDDRAW_BOXTYPE_FRAME:
slBoxType = GLGDDRAW_BOXTYPE_FRAME;
break;
default:
slBoxType = GLGDDRAW_BOXTYPE_BORDER;
break;
}
pos[0] = xsl;
pos[1] = ysl;
dim[0] = wsl;
dim[1] = hsl;
glgdDrawBox(slBoxType, pos, dim, col2, GLGDDRAW_BW2);
}
glgdPopAttributes();
}
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