/* * Copyright (c) 2012, 2013, Joel Bodenmann aka Tectu * Copyright (c) 2012, 2013, Andrew Hannam aka inmarket * Derived from the 2011 IOCCC submission by peter.eastman@gmail.com * * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * Neither the name of the nor the * names of its contributors may be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "gfx.h" #include /** * NOTE: * * This demo uses floating point operations. Don't expect it to work with any * speed unless your processor has an FPU. * * If you see garbage inside the ball as it is running rather than the red and yellow * checkerboard pattern then the fast invsqrt() function in GMISC does not work on * your processor. * * You can modify the implementation of invsqrt() by firstly defining * #define GMISC_INVSQRT_MIXED_ENDIAN TRUE * in your gfxconf.h file. * * If it still doesn't work then instead define * #define GMISC_INVSQRT_REAL_SLOW TRUE * in your gfxconf.h file. This should always work although it will probably be slow. */ #define BALLCOLOR1 Red #define BALLCOLOR2 Yellow #define WALLCOLOR HTML2COLOR(0x303030) #define BACKCOLOR HTML2COLOR(0xC0C0C0) #define FLOORCOLOR HTML2COLOR(0x606060) #define SHADOWALPHA (255-255*0.2) int main(void) { coord_t width, height, x, y, radius, ballx, bally, dx, floor; coord_t minx, miny, maxx, maxy; coord_t ballcx, ballcy; color_t colour; float ii, spin, dy, spinspeed, h, f, g; gfxInit(); #if GDISP_NEED_CONTROL gdispSetOrientation(GDISP_ROTATE_90); #endif width = gdispGetWidth(); height = gdispGetHeight(); radius=height/5+height%2+1; // The ball radius ii = 1.0/radius; // radius as easy math floor=height/5-1; // floor position spin=0.0; // current spin angle on the ball spinspeed=0.1; // current spin speed of the ball ballx=width/2; // ball x position (relative to the ball center) bally=height/4; // ball y position (relative to the ball center) dx=.01*width; // motion in the x axis dy=0.0; // motion in the y axis ballcx = 12*radius/5; // ball x diameter including the shadow ballcy = 21*radius/10; // ball y diameter including the shadow minx = miny = 0; maxx = width; maxy = height; // The clipping window for this frame. while(1) { // Draw one frame gdispStreamStart(minx, miny, maxx-minx, maxy-miny); for (y=miny; h = (bally-y)*ii, y height-floor) { if (x < height-y || height-y > width-x) colour = WALLCOLOR; else colour = FLOORCOLOR; } else if (xwidth-floor) colour = WALLCOLOR; else colour = BACKCOLOR; // The ball shadow is darker if (g*(g+.4)+h*(h+.1) < 1) colour = gdispBlendColor(colour, Black, SHADOWALPHA); } gdispStreamColor(colour); /* pixel to the LCD */ } } gdispStreamStop(); // Force a display update if the controller supports it gdispFlush(); // Calculate the new frame size (note this is a drawing optimisation only) minx = ballx - radius; miny = bally - radius; maxx = minx + ballcx; maxy = miny + ballcy; if (dx > 0) maxx += dx; else minx += dx; if (dy > 0) maxy += dy; else miny += dy; if (minx < 0) minx = 0; if (maxx > width) maxx = width; if (miny < 0) miny = 0; if (maxy > height) maxy = height; // Motion spin += spinspeed; ballx += dx; bally += dy; dx = ballx < radius || ballx > width-radius ? spinspeed=-spinspeed,-dx : dx; dy = bally > height-1.75*floor ? -.04*height : dy+.002*height; } }