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+/***********************************************************************
+ * Source File:
+ * User Interface Draw : put pixels on the screen
+ * Author:
+ * Br. Helfrich
+ * Summary:
+ * This is the code necessary to draw on the screen. We have a collection
+ * of procedural functions here because each draw function does not
+ * retain state. In other words, they are verbs (functions), not nouns
+ * (variables) or a mixture (objects)
+ ************************************************************************/
+
+#include <string> // need you ask?
+#include <sstream> // convert an integer into text
+#include <cassert> // I feel the need... the need for asserts
+#include <time.h> // for clock
+
+
+#ifdef __APPLE__
+#include <openGL/gl.h> // Main OpenGL library
+#include <GLUT/glut.h> // Second OpenGL library
+#endif // __APPLE__
+
+#ifdef __linux__
+#include <GL/gl.h> // Main OpenGL library
+#include <GL/glut.h> // Second OpenGL library
+#endif // __linux__
+
+#ifdef _WIN32
+#include <stdio.h>
+#include <stdlib.h>
+#include <GL/glut.h> // OpenGL library we copied
+#define _USE_MATH_DEFINES
+#include <math.h>
+#endif // _WIN32
+
+#include "point.h"
+#include "uiDraw.h"
+
+using namespace std;
+
+#define deg2rad(value) ((M_PI / 180) * (value))
+
+/*********************************************
+ * NUMBER OUTLINES
+ * We are drawing the text for score and things
+ * like that by hand to make it look "old school."
+ * These are how we render each individual charactger.
+ * Note how -1 indicates "done". These are paired
+ * coordinates where the even are the x and the odd
+ * are the y and every 2 pairs represents a point
+ ********************************************/
+const char NUMBER_OUTLINES[10][20] =
+{
+ {0, 0, 7, 0, 7, 0, 7,10, 7,10, 0,10, 0,10, 0, 0, -1,-1, -1,-1},//0
+ {7, 0, 7,10, -1,-1, -1,-1, -1,-1, -1,-1, -1,-1, -1,-1, -1,-1, -1,-1},//1
+ {0, 0, 7, 0, 7, 0, 7, 5, 7, 5, 0, 5, 0, 5, 0,10, 0,10, 7,10},//2
+ {0, 0, 7, 0, 7, 0, 7,10, 7,10, 0,10, 4, 5, 7, 5, -1,-1, -1,-1},//3
+ {0, 0, 0, 5, 0, 5, 7, 5, 7, 0, 7,10, -1,-1, -1,-1, -1,-1, -1,-1},//4
+ {7, 0, 0, 0, 0, 0, 0, 5, 0, 5, 7, 5, 7, 5, 7,10, 7,10, 0,10},//5
+ {7, 0, 0, 0, 0, 0, 0,10, 0,10, 7,10, 7,10, 7, 5, 7, 5, 0, 5},//6
+ {0, 0, 7, 0, 7, 0, 7,10, -1,-1, -1,-1, -1,-1, -1,-1, -1,-1, -1,-1},//7
+ {0, 0, 7, 0, 0, 5, 7, 5, 0,10, 7,10, 0, 0, 0,10, 7, 0, 7,10},//8
+ {0, 0, 7, 0, 7, 0, 7,10, 0, 0, 0, 5, 0, 5, 7, 5, -1,-1, -1,-1} //9
+};
+
+/************************************************************************
+ * DRAW DIGIT
+ * Draw a single digit in the old school line drawing style. The
+ * size of the glyph is 8x11 or x+(0..7), y+(0..10)
+ * INPUT topLeft The top left corner of the character
+ * digit The digit we are rendering: '0' .. '9'
+ *************************************************************************/
+void drawDigit(const Point & topLeft, char digit)
+{
+ // we better be only drawing digits
+ assert(isdigit(digit));
+ if (!isdigit(digit))
+ return;
+
+ // compute the row as specified by the digit
+ int r = digit - '0';
+ assert(r >= 0 && r <= 9);
+
+ // go through each segment.
+ for (int c = 0; c < 20 && NUMBER_OUTLINES[r][c] != -1; c += 4)
+ {
+ assert(NUMBER_OUTLINES[r][c ] != -1 &&
+ NUMBER_OUTLINES[r][c + 1] != -1 &&
+ NUMBER_OUTLINES[r][c + 2] != -1 &&
+ NUMBER_OUTLINES[r][c + 3] != -1);
+
+ //Draw a line based off of the num structure for each number
+ Point start;
+ start.setX(topLeft.getX() + NUMBER_OUTLINES[r][c]);
+ start.setY(topLeft.getY() - NUMBER_OUTLINES[r][c + 1]);
+ Point end;
+ end.setX(topLeft.getX() + NUMBER_OUTLINES[r][c + 2]);
+ end.setY(topLeft.getY() - NUMBER_OUTLINES[r][c + 3]);
+
+ drawLine(start, end);
+ }
+}
+
+/*************************************************************************
+ * DRAW NUMBER
+ * Display an integer on the screen using the 7-segment method
+ * INPUT topLeft The top left corner of the character
+ * digit The digit we are rendering: '0' .. '9'
+ *************************************************************************/
+void drawNumber(const Point & topLeft, int number)
+{
+ // our cursor, if you will. It will advance as we output digits
+ Point point = topLeft;
+
+ // is this negative
+ bool isNegative = (number < 0);
+ number *= (isNegative ? -1 : 1);
+
+ // render the number as text
+ ostringstream sout;
+ sout << number;
+ string text = sout.str();
+
+ // handle the negative
+ if (isNegative)
+ {
+ glBegin(GL_LINES);
+ glVertex2f(point.getX() + 1, point.getY() - 5);
+ glVertex2f(point.getX() + 5, point.getY() - 5);
+ glEnd();
+ point.addX(11);
+ }
+
+ // walk through the text one digit at a time
+ for (const char *p = text.c_str(); *p; p++)
+ {
+ assert(isdigit(*p));
+ drawDigit(point, *p);
+ point.addX(11);
+ }
+}
+
+
+/*************************************************************************
+ * DRAW TEXT
+ * Draw text using a simple bitmap font
+ * INPUT topLeft The top left corner of the text
+ * text The text to be displayed
+ ************************************************************************/
+void drawText(const Point & topLeft, const char * text)
+{
+ void *pFont = GLUT_BITMAP_HELVETICA_12; // also try _18
+
+ // prepare to draw the text from the top-left corner
+ glRasterPos2f(topLeft.getX(), topLeft.getY());
+
+ // loop through the text
+ for (const char *p = text; *p; p++)
+ glutBitmapCharacter(pFont, *p);
+}
+
+/************************************************************************
+ * DRAW POLYGON
+ * Draw a POLYGON from a given location (center) of a given size (radius).
+ * INPUT center Center of the polygon
+ * radius Size of the polygon
+ * points How many points will we draw it. Larger the number,
+ * the more line segments we will use
+ * rotation True circles are rotation independent. However, if you
+ * are drawing a 3-sided polygon (triangle), this matters!
+ *************************************************************************/
+void drawPolygon(const Point & center, int radius, int points, int rotation)
+{
+ // begin drawing
+ glBegin(GL_LINE_LOOP);
+
+ //loop around a circle the given number of times drawing a line from
+ //one point to the next
+ for (double i = 0; i < 2 * M_PI; i += (2 * M_PI) / points)
+ {
+ Point temp(false /*check*/);
+ temp.setX(center.getX() + (radius * cos(i)));
+ temp.setY(center.getY() + (radius * sin(i)));
+ rotate(temp, center, rotation);
+ glVertex2f(temp.getX(), temp.getY());
+ }
+
+ // complete drawing
+ glEnd();
+
+}
+
+
+/************************************************************************
+ * ROTATE
+ * Rotate a given point (point) around a given origin (center) by a given
+ * number of degrees (angle).
+ * INPUT point The point to be moved
+ * center The center point we will rotate around
+ * rotation Rotation in degrees
+ * OUTPUT point The new position
+ *************************************************************************/
+void rotate(Point & point, const Point & origin, int rotation)
+{
+ // because sine and cosine are expensive, we want to call them only once
+ double cosA = cos(deg2rad(rotation));
+ double sinA = sin(deg2rad(rotation));
+
+ // remember our original point
+ Point tmp(false /*check*/);
+ tmp.setX(point.getX() - origin.getX());
+ tmp.setY(point.getY() - origin.getY());
+
+ // find the new values
+ point.setX(static_cast<int> (tmp.getX() * cosA -
+ tmp.getY() * sinA) +
+ origin.getX());
+ point.setY(static_cast<int> (tmp.getX() * sinA +
+ tmp.getY() * cosA) +
+ origin.getY());
+}
+
+/************************************************************************
+ * DRAW LINE
+ * Draw a line on the screen from the beginning to the end.
+ * INPUT begin The position of the beginning of the line
+ * end The position of the end of the line
+ *************************************************************************/
+void drawLine(const Point & begin, const Point & end,
+ float red, float green, float blue)
+{
+ // Get ready...
+ glBegin(GL_LINES);
+ glColor3f(red, green, blue);
+
+ // Draw the actual line
+ glVertex2f(begin.getX(), begin.getY());
+ glVertex2f( end.getX(), end.getY());
+
+ // Complete drawing
+ glColor3f(1.0 /* red % */, 1.0 /* green % */, 1.0 /* blue % */);
+ glEnd();
+}
+
+/***********************************************************************
+ * DRAW Lander
+ * Draw a moon-lander spaceship on the screen at a given point
+ ***********************************************************************/
+void drawLander(const Point & point)
+{
+ // ultra simple point
+ struct PT
+ {
+ int x;
+ int y;
+ } points[] =
+ {
+ {-6, 0}, {-10,0}, {-8, 0}, {-8, 3}, // left foot
+ {-5, 4}, {-5, 7}, {-8, 3}, {-5, 4}, // left leg
+ {-1, 4}, {-3, 2}, { 3, 2}, { 1, 4}, {-1, 4}, // bottom
+ { 5, 4}, { 5, 7}, {-5, 7}, {-3, 7}, // engine square
+ {-6,10}, {-6,13}, {-3,16}, { 3,16}, // left of habitat
+ { 6,13}, { 6,10}, { 3, 7}, { 5, 7}, // right of habitat
+ { 5, 4}, { 8, 3}, { 5, 7}, { 5, 4}, // right leg
+ { 8, 3}, { 8, 0}, {10, 0}, { 6, 0} // right foot
+ };
+
+ // draw it
+ glBegin(GL_LINE_STRIP);
+ for (int i = 0; i < sizeof(points) / sizeof(points[0]); i++)
+ glVertex2f(point.getX() + points[i].x,
+ point.getY() + points[i].y);
+
+ // complete drawing
+ glEnd();
+
+
+}
+
+
+/***********************************************************************
+ * DRAW Lander Flame
+ * Draw the flames coming out of a moonlander for thrust
+ ***********************************************************************/
+void drawLanderFlames(const Point & point,
+ bool bottom,
+ bool left,
+ bool right)
+{
+ // simple point
+ struct PT
+ {
+ int x;
+ int y;
+ };
+
+ int iFlame = random(0, 3); // so the flame flickers
+
+ // draw it
+ glBegin(GL_LINE_LOOP);
+ glColor3f(1.0 /* red % */, 0.0 /* green % */, 0.0 /* blue % */);
+
+ // bottom thrust
+ if (bottom)
+ {
+ PT points[3][3] =
+ {
+ { {-5, -6}, { 0, -1}, { 3, -10} },
+ { {-3, -6}, {-1, -2}, { 0, -15} },
+ { { 2, -12}, { 1, 0}, { 6, -4} }
+ };
+
+ glVertex2f(point.getX() - 2, point.getY() + 2);
+ for (int i = 0; i < 3; i++)
+ glVertex2f(point.getX() + points[iFlame][i].x,
+ point.getY() + points[iFlame][i].y);
+ glVertex2f(point.getX() + 2, point.getY() + 2);
+ }
+
+ // right thrust
+ if (right)
+ {
+ PT points[3][3] =
+ {
+ { {10, 14}, { 8, 12}, {12, 12} },
+ { {12, 10}, { 8, 10}, {10, 8} },
+ { {14, 11}, {14, 11}, {14, 11} }
+ };
+
+ glVertex2f(point.getX() + 6, point.getY() + 12);
+ for (int i = 0; i < 3; i++)
+ glVertex2f(point.getX() + points[iFlame][i].x,
+ point.getY() + points[iFlame][i].y);
+ glVertex2f(point.getX() + 6, point.getY() + 10);
+ }
+
+ // left thrust
+ if (left)
+ {
+ PT points[3][3] =
+ {
+ { {-10, 14}, { -8, 12}, {-12, 12} },
+ { {-12, 10}, { -8, 10}, {-10, 8} },
+ { {-14, 11}, {-14, 11}, {-14, 11} }
+ };
+
+ glVertex2f(point.getX() - 6, point.getY() + 12);
+ for (int i = 0; i < 3; i++)
+ glVertex2f(point.getX() + points[iFlame][i].x,
+ point.getY() + points[iFlame][i].y);
+ glVertex2f(point.getX() - 6, point.getY() + 10);
+ }
+
+ glColor3f(1.0 /* red % */, 1.0 /* green % */, 1.0 /* blue % */);
+ glEnd();
+}
+
+
+/******************************************************************
+ * RANDOM
+ * This function generates a random number.
+ *
+ * INPUT: min, max : The number of values (min <= num < max)
+ * OUTPUT <return> : Return the integer
+ ****************************************************************/
+int random(int min, int max)
+{
+ assert(min < max);
+ int num = (rand() % (max - min)) + min;
+ assert(min <= num && num <= max);
+
+ return num;
+}
+
+/******************************************************************
+ * RANDOM
+ * This function generates a random number.
+ *
+ * INPUT: min, max : The number of values (min <= num < max)
+ * OUTPUT <return> : Return the double
+ ****************************************************************/
+double random(double min, double max)
+{
+ assert(min <= max);
+ double num = min + ((double)rand() / (double)RAND_MAX * (max - min));
+
+ assert(min <= num && num <= max);
+
+ return num;
+}
+
+
+/************************************************************************
+ * DRAW RECTANGLE
+ * Draw a rectangle on the screen centered on a given point (center) of
+ * a given size (width, height), and at a given orientation (rotation)
+ * INPUT center Center of the rectangle
+ * width Horizontal size
+ * height Vertical size
+ * rotation Orientation
+ *************************************************************************/
+void drawRect(const Point & center, int width, int height, int rotation)
+{
+ Point tl(false /*check*/); // top left
+ Point tr(false /*check*/); // top right
+ Point bl(false /*check*/); // bottom left
+ Point br(false /*check*/); // bottom right
+
+ //Top Left point
+ tl.setX(center.getX() - (width / 2));
+ tl.setY(center.getY() + (height / 2));
+
+ //Top right point
+ tr.setX(center.getX() + (width / 2));
+ tr.setY(center.getY() + (height / 2));
+
+ //Bottom left point
+ bl.setX(center.getX() - (width / 2));
+ bl.setY(center.getY() - (height / 2));
+
+ //Bottom right point
+ br.setX(center.getX() + (width / 2));
+ br.setY(center.getY() - (height / 2));
+
+ //Rotate all points the given degrees
+ rotate(tl, center, rotation);
+ rotate(tr, center, rotation);
+ rotate(bl, center, rotation);
+ rotate(br, center, rotation);
+
+ //Finally draw the rectangle
+ glBegin(GL_LINE_STRIP);
+ glVertex2f(tl.getX(), tl.getY());
+ glVertex2f(tr.getX(), tr.getY());
+ glVertex2f(br.getX(), br.getY());
+ glVertex2f(bl.getX(), bl.getY());
+ glVertex2f(tl.getX(), tl.getY());
+ glEnd();
+}
+
+/************************************************************************
+ * DRAW CIRCLE
+ * Draw a circle from a given location (center) of a given size (radius).
+ * INPUT center Center of the circle
+ * radius Size of the circle
+ *************************************************************************/
+void drawCircle(const Point & center, int radius)
+{
+ assert(radius > 1.0);
+ const double increment = 1.0 / (double)radius;
+
+ // begin drawing
+ glBegin(GL_LINE_LOOP);
+
+ // go around the circle
+ for (double radians = 0; radians < M_PI * 2.0; radians += increment)
+ glVertex2f(center.getX() + (radius * cos(radians)),
+ center.getY() + (radius * sin(radians)));
+
+ // complete drawing
+ glEnd();
+}
+
+/************************************************************************
+ * DRAW DOT
+ * Draw a single point on the screen, 2 pixels by 2 pixels
+ * INPUT point The position of the dow
+ *************************************************************************/
+void drawDot(const Point & point)
+{
+ // Get ready, get set...
+ glBegin(GL_POINTS);
+
+ // Go...
+ glVertex2f(point.getX(), point.getY() );
+ glVertex2f(point.getX() + 1, point.getY() );
+ glVertex2f(point.getX() + 1, point.getY() + 1);
+ glVertex2f(point.getX(), point.getY() + 1);
+
+ // Done! OK, that was a bit too dramatic
+ glEnd();
+}
+
+/************************************************************************
+ * DRAW Tough Bird
+ * Draw a tough bird on the screen
+ * INPUT point The position of the sacred
+ * radius The size of the bird
+ * hits How many its remaining to kill the bird
+ *************************************************************************/
+void drawToughBird(const Point & center, float radius, int hits)
+{
+ assert(radius > 1.0);
+ const double increment = M_PI / 6.0;
+
+ // begin drawing
+ glBegin(GL_TRIANGLES);
+
+ // three points: center, pt1, pt2
+ Point pt1(false /*check*/);
+ pt1.setX(center.getX() + (radius * cos(0.0)));
+ pt1.setY(center.getY() + (radius * sin(0.0)));
+ Point pt2(pt1);
+
+ // go around the circle
+ for (double radians = increment;
+ radians <= M_PI * 2.0 + .5;
+ radians += increment)
+ {
+ pt2.setX(center.getX() + (radius * cos(radians)));
+ pt2.setY(center.getY() + (radius * sin(radians)));
+
+ glVertex2f(center.getX(), center.getY());
+ glVertex2f(pt1.getX(), pt1.getY() );
+ glVertex2f(pt2.getX(), pt2.getY() );
+
+ pt1 = pt2;
+ }
+
+ // complete drawing
+ glEnd();
+
+ // draw the score in the center
+ if (hits > 0 && hits < 10)
+ {
+ glColor3f(0.0 /* red % */, 0.0 /* green % */, 0.0 /* blue % */);
+ glRasterPos2f(center.getX() - 4, center.getY() - 3);
+ glutBitmapCharacter(GLUT_BITMAP_8_BY_13, (char)(hits + '0'));
+ glColor3f(1.0, 1.0, 1.0); // reset to white
+ }
+}
+
+/************************************************************************
+ * DRAW Sacred Bird
+ * Draw a sacred bird on the screen
+ * INPUT point The position of the sacred
+ * radius The size of the bird
+ *************************************************************************/
+void drawSacredBird(const Point & center, float radius)
+{
+ // handle auto-rotation
+ static float rotation = 0.0;
+ rotation += 5.0;
+
+
+ // begin drawing
+ glBegin(GL_LINE_LOOP);
+ glColor3f(1.0 /* red % */, 0.0 /* green % */, 0.0 /* blue % */);
+
+
+ //loop around a circle the given number of times drawing a line from
+ //one point to the next
+ for (int i = 0; i < 5; i++)
+ {
+ Point temp(false /*check*/);
+ float radian = (float)i * (M_PI * 2.0) * 0.4;
+ temp.setX(center.getX() + (radius * cos(radian)));
+ temp.setY(center.getY() + (radius * sin(radian)));
+ rotate(temp, center, rotation);
+ glVertex2f(temp.getX(), temp.getY());
+ }
+
+ // complete drawing
+ glColor3f(1.0, 1.0, 1.0); // reset to white
+ glEnd();
+}
+
+/**********************************************************************
+ * DRAW SMALL ASTEROID
+ **********************************************************************/
+void drawSmallAsteroid( const Point & center, int rotation)
+{
+ // ultra simple point
+ struct PT
+ {
+ int x;
+ int y;
+ } points[] =
+ {
+ {-5, 9}, {4, 8}, {8, 4},
+ {8, -5}, {-2, -8}, {-2, -3},
+ {-8, -4}, {-8, 4}, {-5, 10}
+ };
+
+ glBegin(GL_LINE_STRIP);
+ for (int i = 0; i < sizeof(points)/sizeof(PT); i++)
+ {
+ Point pt(center.getX() + points[i].x,
+ center.getY() + points[i].y);
+ rotate(pt, center, rotation);
+ glVertex2f(pt.getX(), pt.getY());
+ }
+ glEnd();
+}
+
+/**********************************************************************
+ * DRAW MEDIUM ASTEROID
+ **********************************************************************/
+void drawMediumAsteroid( const Point & center, int rotation)
+{
+ // ultra simple point
+ struct PT
+ {
+ int x;
+ int y;
+ } points[] =
+ {
+ {2, 8}, {8, 15}, {12, 8},
+ {6, 2}, {12, -6}, {2, -15},
+ {-6, -15}, {-14, -10}, {-15, 0},
+ {-4, 15}, {2, 8}
+ };
+
+ glBegin(GL_LINE_STRIP);
+ for (int i = 0; i < sizeof(points)/sizeof(PT); i++)
+ {
+ Point pt(center.getX() + points[i].x,
+ center.getY() + points[i].y);
+ rotate(pt, center, rotation);
+ glVertex2f(pt.getX(), pt.getY());
+ }
+ glEnd();
+}
+
+/**********************************************************************
+ * DRAW LARGE ASTEROID
+ **********************************************************************/
+void drawLargeAsteroid( const Point & center, int rotation)
+{
+ // ultra simple point
+ struct PT
+ {
+ int x;
+ int y;
+ } points[] =
+ {
+ {0, 12}, {8, 20}, {16, 14},
+ {10, 12}, {20, 0}, {0, -20},
+ {-18, -10}, {-20, -2}, {-20, 14},
+ {-10, 20}, {0, 12}
+ };
+
+ glBegin(GL_LINE_STRIP);
+ for (int i = 0; i < sizeof(points)/sizeof(PT); i++)
+ {
+ Point pt(center.getX() + points[i].x,
+ center.getY() + points[i].y);
+ rotate(pt, center, rotation);
+ glVertex2f(pt.getX(), pt.getY());
+ }
+ glEnd();
+}
+
+
+/************************************************************************
+ * DRAW Ship
+ * Draw a spaceship on the screen
+ * INPUT point The position of the ship
+ * angle Which direction it is ponted
+ *************************************************************************/
+void drawShip(const Point & center, int rotation, bool thrust)
+{
+ // ultra simple point
+ struct PT
+ {
+ int x;
+ int y;
+ };
+
+ // draw the ship
+ const PT pointsShip[] =
+ { // top r.wing r.engine l.engine l.wing top
+ {0, 6}, {6, -6}, {2, -3}, {-2, -3}, {-6, -6}, {0, 6}
+ };
+
+ glBegin(GL_LINE_STRIP);
+ for (int i = 0; i < sizeof(pointsShip)/sizeof(PT); i++)
+ {
+ Point pt(center.getX() + pointsShip[i].x,
+ center.getY() + pointsShip[i].y);
+ rotate(pt, center, rotation);
+ glVertex2f(pt.getX(), pt.getY());
+ }
+ glEnd();
+
+ // draw the flame if necessary
+ if (thrust)
+ {
+ const PT pointsFlame[3][5] =
+ {
+ { {-2, -3}, {-2, -13}, { 0, -6}, { 2, -13}, {2, -3} },
+ { {-2, -3}, {-4, -9}, {-1, -7}, { 1, -14}, {2, -3} },
+ { {-2, -3}, {-1, -14}, { 1, -7}, { 4, -9}, {2, -3} }
+ };
+
+ glBegin(GL_LINE_STRIP);
+ glColor3f(1.0 /* red % */, 0.0 /* green % */, 0.0 /* blue % */);
+ int iFlame = random(0, 3);
+ for (int i = 0; i < 5; i++)
+ {
+ Point pt(center.getX() + pointsFlame[iFlame][i].x,
+ center.getY() + pointsFlame[iFlame][i].y);
+ rotate(pt, center, rotation);
+ glVertex2f(pt.getX(), pt.getY());
+ }
+ glColor3f(1.0, 1.0, 1.0); // reset to white
+ glEnd();
+ }
+}
+
+
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-09-21 10:07:11 +0000