void graphicsDrawRect(JsGraphics *gfx, short x1, short y1, short x2, short y2) {
graphicsToDeviceCoordinates(gfx, &x1, &y1);
graphicsToDeviceCoordinates(gfx, &x2, &y2);
// rather than writing pixels, we use fillrect - as it is faster
graphicsFillRectDevice(gfx,x1,y1,x2,y1);
graphicsFillRectDevice(gfx,x2,y1,x2,y2);
graphicsFillRectDevice(gfx,x1,y2,x2,y2);
graphicsFillRectDevice(gfx,x1,y2,x1,y1);
}
void graphicsDrawCircle(JsGraphics *gfx, short posX, short posY, short rad) {
graphicsToDeviceCoordinates(gfx, &posX, &posY);
int radY = 0,
radX = rad;
// Decision criterion divided by 2 evaluated at radX=radX, radY=0
int decisionOver2 = 1 - radX;
while (radX >= radY) {
graphicsSetPixelDevice(gfx, radX + posX, radY + posY, gfx->data.fgColor);
graphicsSetPixelDevice(gfx, radY + posX, radX + posY, gfx->data.fgColor);
graphicsSetPixelDevice(gfx, -radX + posX, radY + posY, gfx->data.fgColor);
graphicsSetPixelDevice(gfx, -radY + posX, radX + posY, gfx->data.fgColor);
graphicsSetPixelDevice(gfx, -radX + posX, -radY + posY, gfx->data.fgColor);
graphicsSetPixelDevice(gfx, -radY + posX, -radX + posY, gfx->data.fgColor);
graphicsSetPixelDevice(gfx, radX + posX, -radY + posY, gfx->data.fgColor);
graphicsSetPixelDevice(gfx, radY + posX, -radX + posY, gfx->data.fgColor);
radY++;
if (decisionOver2 <= 0) {
// Change in decision criterion for radY -> radY+1
decisionOver2 += 2 * radY + 1;
}
else {
radX--;
// Change for radY -> radY+1, radX -> radX-1
decisionOver2 += 2 * (radY - radX) + 1;
}
}
}
void graphicsDrawLine(JsGraphics *gfx, short x1, short y1, short x2, short y2) {
graphicsToDeviceCoordinates(gfx, &x1, &y1);
graphicsToDeviceCoordinates(gfx, &x2, &y2);
int xl = x2-x1;
int yl = y2-y1;
if (xl<0) xl=-xl; else if (xl==0) xl=1;
if (yl<0) yl=-yl; else if (yl==0) yl=1;
if (xl > yl) { // longer in X - scan in X
if (x1>x2) {
short t;
t = x1; x1 = x2; x2 = t;
t = y1; y1 = y2; y2 = t;
}
int pos = (y1<<8) + 128; // rounding!
int step = ((y2-y1)<<8) / xl;
short x;
for (x=x1;x<=x2;x++) {
graphicsSetPixelDevice(gfx, x, (short)(pos>>8), gfx->data.fgColor);
pos += step;
}
} else {
if (y1>y2) {
void graphicsFillCircle(JsGraphics *gfx, short x, short y, short rad) {
graphicsToDeviceCoordinates(gfx, &x, &y);
int radY = 0;
int decisionOver2 = 1 - rad;
while (rad >= radY) {
graphicsFillRectDevice(gfx, rad + x, radY + y, -rad + x, -radY + y);
graphicsFillRectDevice(gfx, radY + x, rad + y, -radY + x, -rad + y);
graphicsFillRectDevice(gfx, -rad + x, radY + y, rad + x, -radY + y);
graphicsFillRectDevice(gfx, -radY + x, rad + y, radY + x, -rad + y);
radY++;
if (decisionOver2 <= 0){
// Change in decision criterion for radY -> radY+1
decisionOver2 += 2 * radY + 1;
}else{
rad--;
// Change for radY -> radY+1, rad -> rad-1
decisionOver2 += 2 * (radY - rad) + 1;
}
}
}
void graphicsFillRect(JsGraphics *gfx, short x1, short y1, short x2, short y2) {
graphicsToDeviceCoordinates(gfx, &x1, &y1);
graphicsToDeviceCoordinates(gfx, &x2, &y2);
graphicsFillRectDevice(gfx, x1, y1, x2, y2);
}
unsigned int graphicsGetPixel(JsGraphics *gfx, short x, short y) {
graphicsToDeviceCoordinates(gfx, &x, &y);
return graphicsGetPixelDevice(gfx, x, y);
}
void graphicsSetPixel(JsGraphics *gfx, short x, short y, unsigned int col) {
graphicsToDeviceCoordinates(gfx, &x, &y);
graphicsSetPixelDevice(gfx, x, y, col);
}
