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Src/Plugins/Visualization/vis_avs/linedraw.cpp
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261
Src/Plugins/Visualization/vis_avs/linedraw.cpp
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/*
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LICENSE
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-------
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Copyright 2005 Nullsoft, Inc.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation
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and/or other materials provided with the distribution.
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* Neither the name of Nullsoft nor the names of its contributors may be used to
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endorse or promote products derived from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <windows.h>
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#include "r_defs.h"
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#include <math.h>
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#define SWAP(x,y,temp) ( temp ) = ( x ); ( x ) = ( y ); ( y ) = ( temp )
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#define ABS(x) (( x ) < 0 ? - ( x ) : ( x ))
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void line(int *fb, int x1,int y1,int x2,int y2, int width, int height, int color, int lw)
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{
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int dy = ABS(y2-y1);
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int dx = ABS(x2-x1);
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#ifdef LASER
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lw=1;
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#define BLEND_LINE(fb,color) (*(fb)=BLEND(*(fb),(color)))
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#else
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if (lw<1) lw=1;
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else if (lw>255)lw=255;
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#endif
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int lw2=lw/2;
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if (!dx) // optimize vertical draw
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{
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x1-=lw2;
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if (x1+lw >= 0 && x1 < width)
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{
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int d=max(min(y1,y2),0);
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int ye=min(max(y1,y2),height-1);
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if (x1<0)
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{
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lw+=x1;
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x1=0;
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}
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if (x1+lw >= width) lw=width-x1;
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fb += d*width+x1;
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width-=lw;
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if (lw>0) while (d++ < ye)
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{
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int x=lw;
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while (x--) { BLEND_LINE(fb, color); fb++; }
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fb+=width;
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}
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}
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return;
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}
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if (y1==y2) // optimize horizontal draw.
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{
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y1-=lw2;
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if (y1+lw >= 0 && y1 < height)
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{
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int d=max(min(x1,x2),0);
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int xe=min(max(x1,x2),width-1);
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if (y1<0)
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{
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lw+=y1;
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y1=0;
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}
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if (y1+lw >= height) lw=height-y1;
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fb+=y1*width+d;
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width-=xe-d;
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int y=lw;
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while (y--)
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{
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int lt=d;
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while (lt++<xe) { BLEND_LINE(fb,color); fb++; }
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fb+=width;
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}
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}
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return;
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}
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if (dy <= dx) // x major, low slope
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{
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// first things first for better line drawing, let's see if we can't get the
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// width calculated right.
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// lw is the width in pixels. if dy = 0, then lw=lw. if dy=dx, then:
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/*
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__________ C=30d
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| \ lw
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| \_____ A=90d
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? | /
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| / pc2
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|/ ____ B = 60d
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tan(C) = sin(C)/cos(C) = (dy / dx)
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cos(C) = lw / ?
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sin(C)/(lw / ? ) = (dy / dx)
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sin(C) * ? / lw = (dy/dx)
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sin(C) * ? = lw * dy/dx;
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? = lw * dy/dx / sin(C)
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cos(C) = lw / ? === ? = lw / cos(C)
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tan(C) = dy / dx;
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C = atan2(dy,dx);
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? = lw / cos(C)
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*/
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#if 0// lame
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if (lw>1 && (GetAsyncKeyState(VK_SHIFT)&0x8000)){
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double d=atan2((double)dy,(double)dx);
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lw = (int) (lw / cos(d));
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if (lw<1)lw=1;
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}
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#endif
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if (x2 < x1)
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{
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int temp;
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SWAP(x1,x2,temp);
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SWAP(y1,y2,temp);
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}
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int yincr = y2>y1?1:-1;
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int offsincr= y2>y1?width:-width;
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y1-=lw2;
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int offs = y1 * width + x1;
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int d = dy + dy - dx;
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int Eincr = dy + dy;
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int NEincr = d - dx;
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if (x2 >= 0 && x1 < width)
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{
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if (x1<0)
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{
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int v;
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v=yincr * -x1;
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if (dx) v= (v * dy)/dx;
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y1 += v;
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offs += v*width - x1;
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x1=0;
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}
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if (x2 > width) x2=width;
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while (x1<x2)
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{
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int yp=y1;
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int ype=y1+lw;
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int *newfb=fb+offs;
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if (yp < 0)
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{
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newfb-=yp*width;
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yp=0;
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}
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if (ype>height) ype=height;
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while (yp++ < ype)
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{
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BLEND_LINE(newfb,color);
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newfb+=width;
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}
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if (d < 0) d += Eincr;
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else
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{
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d += NEincr;
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y1 += yincr;
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offs += offsincr;
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}
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offs++;
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x1++;
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}
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}
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}
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else
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{
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#if 0//lame
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if (lw>1 && (GetAsyncKeyState(VK_SHIFT)&0x8000)){
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double d=atan2((double)dx,(double)dy);
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lw = (int) (lw / cos(d));
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if (lw<1)lw=1;
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}
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#endif
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if (y2 < y1)
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{
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int temp;
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SWAP(x1,x2,temp);
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SWAP(y1,y2,temp);
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}
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int yincr=(x2>x1)?1:-1;
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int d = dx + dx - dy;
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int Eincr = dx + dx;
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int NEincr = d - dy;
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x1-=lw2;
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int offs = y1 * width + x1;
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if (y2 >= 0 && y1 < height)
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{
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if (y1<0)
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{
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int v;
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v=yincr * -y1;
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if (dy) v= (v * dx)/dy;
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x1 += v;
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offs += v - y1*width;
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y1=0;
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}
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if (y2 > height) y2 = height;
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while (y1 < y2)
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{
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int xp=x1;
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int xpe=x1+lw;
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int *newfb=fb+offs;
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if (xp<0)
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{
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newfb-=xp;
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xp=0;
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}
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if (xpe > width) xpe=width;
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while (xp++ < xpe) { BLEND_LINE(newfb, color); newfb++; }
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if (d < 0) d += Eincr;
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else
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{
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d += NEincr;
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x1 += yincr;
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offs += yincr;
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}
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offs += width;
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y1++;
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}
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}
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}
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}
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