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Read the paint program below carefully and complete the source code paint.cpp by:
/* paint.cpp */
#define LINE 1
#define RECTANGLE 2
#define TRIANGLE 3
#define POINTS 4
#define TEXT 5
#include <stdlib.h>
#include <GL/glut.h>
// global variables
GLsizei wh = 500, ww = 500; // initial window size
GLfloat size = 3.0; // half side length of square
int draw_mode = 0; // drawing mode
int rx, ry; // raster position
GLfloat r = 1.0, g = 1.0, b = 1.0; // drawing color
int fill = 0; // fill flag
// pick function
int pick(int x, int y)
{
y = wh - y;
if(y < wh-ww/10) return 0;
else if(x < ww/10) return LINE;
else if(x < ww/5) return RECTANGLE;
else if(x < 3*ww/10) return TRIANGLE;
else if(x < 2*ww/5) return POINTS;
else if(x < ww/2) return TEXT;
else return 0;
}
// draw square function
void drawSquare(int x, int y)
{
y=wh-y;
glColor3ub( (char) rand()%256, (char) rand()%256, (char) rand()%256);
glBegin(GL_POLYGON);
glVertex2f(x+size, y+size);
glVertex2f(x-size, y+size);
glVertex2f(x-size, y-size);
glVertex2f(x+size, y-size);
glEnd();
}
// mouse event handlers
void mouse(int btn, int state, int x, int y)
{
static int count;
int where;
static int xp[2],yp[2];
if(btn==GLUT_LEFT_BUTTON && state==GLUT_DOWN)
{
glPushAttrib(GL_ALL_ATTRIB_BITS);
where = pick(x,y);
glColor3f(r, g, b);
if(where != 0)
{
count = 0;
draw_mode = where;
}
else
switch(draw_mode)
{
case(LINE):
if(count==0)
{
count++;
xp[0] = x;
yp[0] = y;
}
else
{
glBegin(GL_LINES);
glVertex2i(x,wh-y);
glVertex2i(xp[0],wh-yp[0]);
glEnd();
count=0;
}
break;
case(RECTANGLE):
if(count == 0)
{
count++;
xp[0] = x;
yp[0] = y;
}
else
{
if(fill) glBegin(GL_POLYGON);
else glBegin(GL_LINE_LOOP);
glVertex2i(x,wh-y);
glVertex2i(x,wh-yp[0]);
glVertex2i(xp[0],wh-yp[0]);
glVertex2i(xp[0],wh-y);
glEnd();
count=0;
}
break;
case (TRIANGLE):
switch(count)
{
case(0):
count++;
xp[0] = x;
yp[0] = y;
break;
case(1):
count++;
xp[1] = x;
yp[1] = y;
break;
case(2):
if(fill) glBegin(GL_POLYGON);
else glBegin(GL_LINE_LOOP);
glVertex2i(xp[0],wh-yp[0]);
glVertex2i(xp[1],wh-yp[1]);
glVertex2i(x,wh-y);
glEnd();
count=0;
}
break;
case(POINTS):
{
drawSquare(x,y);
count++;
}
break;
case(TEXT):
{
rx=x;
ry=wh-y;
glRasterPos2i(rx,ry);
count=0;
}
}
glPopAttrib();
glFlush();
}
}
// keyboard input function
void key(unsigned char k, int xx, int yy)
{
if(draw_mode!=TEXT) return;
glColor3f(0.0,0.0,0.0);
glRasterPos2i(rx,ry);
glutBitmapCharacter(GLUT_BITMAP_9_BY_15, k);
rx+=glutBitmapWidth(GLUT_BITMAP_9_BY_15,k);
}
// draw screen box
void screen_box(int x, int y, int s )
{
glBegin(GL_QUADS);
glVertex2i(x, y);
glVertex2i(x+s, y);
glVertex2i(x+s, y+s);
glVertex2i(x, y+s);
glEnd();
}
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