/**
* Draw a polygon in the foreground color, applying clipping if necessary.
* The polygon is only closed if the first point is repeated at the end.
* Some care is taken to plot the endpoints correctly if the current
* drawing mode is XOR. However, internal crossings are not handled
* correctly.
*
* @param psd Drawing surface.
* @param count Number of points in polygon.
* @param points The array of points.
*/
void
GdPoly(PSD psd, int count, MWPOINT *points)
{
MWCOORD firstx;
MWCOORD firsty;
MWBOOL didline;
if (count < 2)
return;
firstx = points->x;
firsty = points->y;
didline = FALSE;
while (count-- > 1) {
if (didline && (gr_mode == MWMODE_XOR))
drawpoint(psd, points->x, points->y);
/* note: change to drawline*/
GdLine(psd, points[0].x, points[0].y, points[1].x, points[1].y, TRUE);
points++;
didline = TRUE;
}
if (gr_mode == MWMODE_XOR) {
points--;
if (points->x == firstx && points->y == firsty)
drawpoint(psd, points->x, points->y);
}
GdFixCursor(psd);
}
int TBMP::drawline(int x0, int y0, int x1, int y1){
#ifdef BMP_TEST
if (!checkborder(x0, y0) || !checkborder(x1, y1))
return 1;
if (x0==x1 && y0==y1)
return drawpoint(x0, y0);
int xs, ys, xe, ye;
int i, j;
double t;
if (abs(x0-x1) >= abs(y0-y1)){
if (x0 < x1){
xs = x0;
ys = y0;
xe = x1;
ye = y1;
}
else{
xs = x1;
ys = y1;
xe = x0;
ye = y0;
}
t = (double)(ye - ys) / (double)(xe - xs);
for (i=xs; i<=xe; i++){
j = (int)((i - xs) * t + ys);
drawpoint(i,j);
//bitmap[j][i] = Grey;
}
}
else{
if (y0 < y1){
xs = x0;
ys = y0;
xe = x1;
ye = y1;
}
else{
xs = x1;
ys = y1;
xe = x0;
ye = y0;
}
t = (double)(xe - xs) / (double)(ye - ys);
for (j=ys; j<=ye; j++){
i = (int)((j-ys) * t + xs);
drawpoint(i,j);
//bitmap[j][i] =Grey;
}
}
return 0;
#endif
}
void draw_data(FR_GUI_GRAPH_T* gr,FR_DATA_T* data_struct){
if(data_struct->pointQTY>=2){
FR_DATA_POINT_T* actualpoint;
FR_DATA_POINT_T* nextpoint;
actualpoint=data_struct->first_point;
do{
nextpoint=actualpoint->next;
//GUI_DrawLine(actualpoint->x,actualpoint->y,nextpoint->x,nextpoint->y);
drawpoint(actualpoint,nextpoint,gr);
actualpoint=nextpoint;
}while(actualpoint!=NULL);
}
}
void myDisplay(void)
{
// 清除。GL_COLOR_BUFFER_BIT表示清除颜色
/*
在RGB模式下，使用glClearColor来指定“空”的颜色，它需要四个参数，其参数的意义跟glColor4f相似。
在索引颜色模式下，使用glClearIndex来指定“空”的颜色所在的索引，它需要一个参数，其意义跟glIndexi相似。
*/
glClearColor(0.5f, 0.5f, 0.5f, 0.5f);
glClear(GL_COLOR_BUFFER_BIT);
drawrect();
drawpoint();
drawline();
drawpolygon();
draw5star();
drawsin();
drawtriangle();
//保证前面的OpenGL命令立即执行（而不是让它们在缓冲区中等待）。其作用跟fflush(stdout)类似。
glFlush();
}
/**
* Draw a polygon in the foreground color, applying clipping if necessary.
* The polygon is only closed if the first point is repeated at the end.
* Some care is taken to plot the endpoints correctly if the current
* drawing mode is XOR. However, internal crossings are not handled
* correctly.
*
* @param psd Drawing surface.
* @param count Number of points in polygon.
* @param points The array of points.
*/
void cgfx_Poly(CoreGfxBase *CoreGfxBase, struct CRastPort *rp, int count, CGfxPoint *points)
{
INT32 firstx;
INT32 firsty;
BOOL didline;
if (count < 2) return;
firstx = points->x;
firsty = points->y;
didline = FALSE;
while (count-- > 1) {
if (didline && (rp->crp_Mode == ROP_XOR)) drawpoint(CoreGfxBase, rp, points->x, points->y);
/* note: change to drawline*/
Line(rp, points[0].x, points[0].y, points[1].x, points[1].y, TRUE);
points++;
didline = TRUE;
}
if (rp->crp_Mode == ROP_XOR) {
points--;
if (points->x == firstx && points->y == firsty) drawpoint(CoreGfxBase, rp, points->x, points->y);
}
FixCursor(rp->crp_PixMap);
}
