Chris Dick / Mbed 2 deprecated Gameduino_Bitmap_demo

Bitmap demo for the Gameduino

Dependencies:   Gameduino mbed

main.cpp@1:3637b078dd83, 2012-12-21 (annotated)

Committer:
TheChrisyd
Date:
Fri Dec 21 13:47:20 2012 +0000
Revision:
1:3637b078dd83
Parent:
0:abda4161bf6e 
updated Gameduino library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
TheChrisyd 0:abda4161bf6e 1 #include "mbed.h"
TheChrisyd 0:abda4161bf6e 2 #include "GD.h"
TheChrisyd 0:abda4161bf6e 3 #include "shield.h"
TheChrisyd 0:abda4161bf6e 4 GDClass GD(ARD_MOSI, ARD_MISO, ARD_SCK, ARD_D9, USBTX, USBRX) ;
TheChrisyd 0:abda4161bf6e 5
TheChrisyd 0:abda4161bf6e 6
TheChrisyd 0:abda4161bf6e 7 // replicate a 2-bit color across the whole byte. Optimization for setpixel
TheChrisyd 0:abda4161bf6e 8 byte replicate(byte color)
TheChrisyd 0:abda4161bf6e 9 {
TheChrisyd 0:abda4161bf6e 10 return (color << 6) | (color << 4) | (color << 2) | color;
TheChrisyd 0:abda4161bf6e 11 }
TheChrisyd 0:abda4161bf6e 12
TheChrisyd 0:abda4161bf6e 13 // Set pixel at (x,y) to color. (note that color is replicated).
TheChrisyd 0:abda4161bf6e 14 void setpixel(byte x, byte y, byte color)
TheChrisyd 0:abda4161bf6e 15 {
TheChrisyd 0:abda4161bf6e 16 /*
TheChrisyd 0:abda4161bf6e 17 Because of the way the sprites are laid out in setup(), it's not too
TheChrisyd 0:abda4161bf6e 18 hard to translate the pixel (x,y) to an address and mask. Taking the
TheChrisyd 0:abda4161bf6e 19 two byte values as x7-x0 and y7-y0, the address of the pixel is:
TheChrisyd 0:abda4161bf6e 20
TheChrisyd 0:abda4161bf6e 21 x5 x4 y7 y6 y5 y4 y3 y2 y1 y0 x3 x2 x1 x0
TheChrisyd 0:abda4161bf6e 22
TheChrisyd 0:abda4161bf6e 23 (x6, x7) gives the value of the mask.
TheChrisyd 0:abda4161bf6e 24 */
TheChrisyd 0:abda4161bf6e 25 unsigned int addr = RAM_SPRIMG | (x & 0xf) | (y << 4) | ((x & 0x30) << 8);
TheChrisyd 0:abda4161bf6e 26 byte mask = 0xc0 >> ((x >> 5) & 6);
TheChrisyd 0:abda4161bf6e 27 GD.wr(addr, (GD.rd(addr) & ~mask) | (color & mask));
TheChrisyd 0:abda4161bf6e 28 }
TheChrisyd 0:abda4161bf6e 29
TheChrisyd 0:abda4161bf6e 30 // Draw color line from (x0,y0) to (x1,y1).
TheChrisyd 0:abda4161bf6e 31 void line(byte x0, byte y0, byte x1, byte y1, byte color)
TheChrisyd 0:abda4161bf6e 32 {
TheChrisyd 0:abda4161bf6e 33 byte swap;
TheChrisyd 0:abda4161bf6e 34 #define SWAP(a, b) (swap = (a), (a) = (b), (b) = swap)
TheChrisyd 0:abda4161bf6e 35
TheChrisyd 0:abda4161bf6e 36 color = replicate(color);
TheChrisyd 0:abda4161bf6e 37 byte steep = abs(y1 - y0) > abs(x1 - x0);
TheChrisyd 0:abda4161bf6e 38 if (steep) {
TheChrisyd 0:abda4161bf6e 39 SWAP(x0, y0);
TheChrisyd 0:abda4161bf6e 40 SWAP(x1, y1);
TheChrisyd 0:abda4161bf6e 41 }
TheChrisyd 0:abda4161bf6e 42 if (x0 > x1) {
TheChrisyd 0:abda4161bf6e 43 SWAP(x0, x1);
TheChrisyd 0:abda4161bf6e 44 SWAP(y0, y1);
TheChrisyd 0:abda4161bf6e 45 }
TheChrisyd 0:abda4161bf6e 46 int deltax = x1 - x0;
TheChrisyd 0:abda4161bf6e 47 int deltay = abs(y1 - y0);
TheChrisyd 0:abda4161bf6e 48 int error = deltax / 2;
TheChrisyd 0:abda4161bf6e 49 signed char ystep;
TheChrisyd 0:abda4161bf6e 50 if (y0 < y1)
TheChrisyd 0:abda4161bf6e 51 {
TheChrisyd 0:abda4161bf6e 52 ystep = 1;
TheChrisyd 0:abda4161bf6e 53 }
TheChrisyd 0:abda4161bf6e 54 else
TheChrisyd 0:abda4161bf6e 55 {
TheChrisyd 0:abda4161bf6e 56 ystep = -1;
TheChrisyd 0:abda4161bf6e 57 }
TheChrisyd 0:abda4161bf6e 58 byte x;
TheChrisyd 0:abda4161bf6e 59 byte y = y0;
TheChrisyd 0:abda4161bf6e 60 for (x = x0; x < x1; x++)
TheChrisyd 0:abda4161bf6e 61 {
TheChrisyd 0:abda4161bf6e 62 if (steep)
TheChrisyd 0:abda4161bf6e 63 {
TheChrisyd 0:abda4161bf6e 64 setpixel(y, x, color);
TheChrisyd 0:abda4161bf6e 65 }
TheChrisyd 0:abda4161bf6e 66 else
TheChrisyd 0:abda4161bf6e 67 {
TheChrisyd 0:abda4161bf6e 68 setpixel(x, y, color);
TheChrisyd 0:abda4161bf6e 69 }
TheChrisyd 0:abda4161bf6e 70 error -= deltay;
TheChrisyd 0:abda4161bf6e 71 if (error < 0)
TheChrisyd 0:abda4161bf6e 72 {
TheChrisyd 0:abda4161bf6e 73 y += ystep;
TheChrisyd 0:abda4161bf6e 74 error += deltax;
TheChrisyd 0:abda4161bf6e 75 }
TheChrisyd 0:abda4161bf6e 76 }
TheChrisyd 0:abda4161bf6e 77 }
TheChrisyd 0:abda4161bf6e 78
TheChrisyd 0:abda4161bf6e 79 struct point {
TheChrisyd 0:abda4161bf6e 80 int x, y;
TheChrisyd 0:abda4161bf6e 81 signed char xv, yv;
TheChrisyd 0:abda4161bf6e 82 };
TheChrisyd 0:abda4161bf6e 83 static struct point triangle[3];
TheChrisyd 0:abda4161bf6e 84
TheChrisyd 0:abda4161bf6e 85 #define RANDOM_RGB() RGB(rand()%256,rand()%256,rand()%256)
TheChrisyd 0:abda4161bf6e 86
TheChrisyd 0:abda4161bf6e 87 // Restart the drawing
TheChrisyd 0:abda4161bf6e 88 static void restart()
TheChrisyd 0:abda4161bf6e 89 {
TheChrisyd 0:abda4161bf6e 90 // Clear the screen
TheChrisyd 0:abda4161bf6e 91 GD.fill(RAM_SPRIMG, 0, 16384);
TheChrisyd 0:abda4161bf6e 92
TheChrisyd 0:abda4161bf6e 93 // Position triangle at random
TheChrisyd 0:abda4161bf6e 94 byte i;
TheChrisyd 0:abda4161bf6e 95 for (i = 0; i < 3; i++) {
TheChrisyd 0:abda4161bf6e 96 triangle[i].x = 3 + rand()%250;
TheChrisyd 0:abda4161bf6e 97 triangle[i].y = 3 + rand()%250;
TheChrisyd 0:abda4161bf6e 98 }
TheChrisyd 0:abda4161bf6e 99 triangle[0].xv = 1;
TheChrisyd 0:abda4161bf6e 100 triangle[0].yv = 1;
TheChrisyd 0:abda4161bf6e 101 triangle[1].xv = -1;
TheChrisyd 0:abda4161bf6e 102 triangle[1].yv = 1;
TheChrisyd 0:abda4161bf6e 103 triangle[2].xv = 1;
TheChrisyd 0:abda4161bf6e 104 triangle[2].yv = -1;
TheChrisyd 0:abda4161bf6e 105
TheChrisyd 0:abda4161bf6e 106 // Choose a random palette
TheChrisyd 0:abda4161bf6e 107 GD.wr16(PALETTE4A, RGB(0,0,0));
TheChrisyd 0:abda4161bf6e 108 GD.wr16(PALETTE4A + 2, RANDOM_RGB());
TheChrisyd 0:abda4161bf6e 109 GD.wr16(PALETTE4A + 4, RANDOM_RGB());
TheChrisyd 0:abda4161bf6e 110 GD.wr16(PALETTE4A + 6, RANDOM_RGB());
TheChrisyd 0:abda4161bf6e 111 }
TheChrisyd 0:abda4161bf6e 112
TheChrisyd 0:abda4161bf6e 113 void setup()
TheChrisyd 0:abda4161bf6e 114 {
TheChrisyd 0:abda4161bf6e 115 int i;
TheChrisyd 0:abda4161bf6e 116
TheChrisyd 0:abda4161bf6e 117 GD.begin();
TheChrisyd 0:abda4161bf6e 118 GD.ascii();
TheChrisyd 0:abda4161bf6e 119 GD.putstr(0, 0,"Bitmap demonstration");
TheChrisyd 0:abda4161bf6e 120
TheChrisyd 0:abda4161bf6e 121 // Draw 256 sprites left to right, top to bottom, all in 4-color
TheChrisyd 0:abda4161bf6e 122 // palette mode. By doing them in column-wise order, the address
TheChrisyd 0:abda4161bf6e 123 // calculation in setpixel is made simpler.
TheChrisyd 0:abda4161bf6e 124 // First 64 use bits 0-1, next 64 use bits 2-4, etc.
TheChrisyd 0:abda4161bf6e 125 // This gives a 256 x 256 4-color bitmap.
TheChrisyd 0:abda4161bf6e 126
TheChrisyd 0:abda4161bf6e 127 for (i = 0; i < 256; i++) {
TheChrisyd 0:abda4161bf6e 128 int x = 72 + 16 * ((i >> 4) & 15);
TheChrisyd 0:abda4161bf6e 129 int y = 22 + 16 * (i & 15);
TheChrisyd 0:abda4161bf6e 130 int image = i & 63; /* image 0-63 */
TheChrisyd 0:abda4161bf6e 131 int pal = 3 - (i >> 6); /* palettes bits in columns 3,2,1,0 */
TheChrisyd 0:abda4161bf6e 132 GD.sprite(i, x, y, image, 0x8 | (pal << 1), 0);
TheChrisyd 0:abda4161bf6e 133 }
TheChrisyd 0:abda4161bf6e 134 restart();
TheChrisyd 0:abda4161bf6e 135 }
TheChrisyd 0:abda4161bf6e 136
TheChrisyd 0:abda4161bf6e 137 int main()
TheChrisyd 0:abda4161bf6e 138 {
TheChrisyd 0:abda4161bf6e 139 setup();
TheChrisyd 0:abda4161bf6e 140 while(1)
TheChrisyd 0:abda4161bf6e 141 {
TheChrisyd 0:abda4161bf6e 142 static byte color;
TheChrisyd 0:abda4161bf6e 143
TheChrisyd 0:abda4161bf6e 144 if (rand()%1000 == 0)
TheChrisyd 0:abda4161bf6e 145 {
TheChrisyd 0:abda4161bf6e 146 restart();
TheChrisyd 0:abda4161bf6e 147 }
TheChrisyd 0:abda4161bf6e 148 line(triangle[0].x, triangle[0].y, triangle[1].x, triangle[1].y, color);
TheChrisyd 0:abda4161bf6e 149 line(triangle[1].x, triangle[1].y, triangle[2].x, triangle[2].y, color);
TheChrisyd 0:abda4161bf6e 150 line(triangle[2].x, triangle[2].y, triangle[0].x, triangle[0].y, color);
TheChrisyd 0:abda4161bf6e 151 color = (color + 1) & 3;
TheChrisyd 0:abda4161bf6e 152 byte i;
TheChrisyd 0:abda4161bf6e 153 for (i = 0; i < 3; i++)
TheChrisyd 0:abda4161bf6e 154 {
TheChrisyd 0:abda4161bf6e 155 triangle[i].x += triangle[i].xv;
TheChrisyd 0:abda4161bf6e 156 triangle[i].y += triangle[i].yv;
TheChrisyd 0:abda4161bf6e 157 if (triangle[i].x == 0 || triangle[i].x == 255)
TheChrisyd 0:abda4161bf6e 158 {
TheChrisyd 0:abda4161bf6e 159 triangle[i].xv = -triangle[i].xv;
TheChrisyd 0:abda4161bf6e 160 }
TheChrisyd 0:abda4161bf6e 161 if (triangle[i].y == 0 || triangle[i].y == 255)
TheChrisyd 0:abda4161bf6e 162 {
TheChrisyd 0:abda4161bf6e 163 triangle[i].yv = -triangle[i].yv;
TheChrisyd 0:abda4161bf6e 164 }
TheChrisyd 0:abda4161bf6e 165 }
TheChrisyd 0:abda4161bf6e 166 }
TheChrisyd 0:abda4161bf6e 167 }