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290 lines
7.6 KiB
290 lines
7.6 KiB
#include <windows.h>
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#include "drawpie.h"
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#ifdef WIN32
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#define MoveTo(_hdc,_x,_y) MoveToEx(_hdc, _x, _y, NULL)
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#endif // WIN32
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int NEAR IntSqrt(unsigned long dwNum)
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{
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// We will keep shifting dwNum left and look at the top two bits.
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// initialize sqrt and remainder to 0.
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DWORD dwSqrt = 0, dwRemain = 0, dwTry;
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int i;
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// We iterate 16 times, once for each pair of bits.
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for (i=0; i<16; ++i)
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{
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// Mask off the top two bits of dwNum and rotate them into the
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// bottom of the remainder
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dwRemain = (dwRemain<<2) | (dwNum>>30);
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// Now we shift the sqrt left; next we'll determine whether the
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// new bit is a 1 or a 0.
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dwSqrt <<= 1;
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// This is where we double what we already have, and try a 1 in
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// the lowest bit.
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dwTry = dwSqrt*2 + 1;
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if (dwRemain >= dwTry)
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{
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// The remainder was big enough, so subtract dwTry from
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// the remainder and tack a 1 onto the sqrt.
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dwRemain -= dwTry;
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dwSqrt |= 0x01;
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}
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// Shift dwNum to the left by 2 so we can work on the next few
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// bits.
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dwNum <<= 2;
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}
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return(dwSqrt);
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}
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VOID NEAR DrawPie(HDC hDC, LPCRECT lprcItem, UINT uPctX10, BOOL TrueZr100,
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UINT uOffset, const COLORREF FAR *lpColors)
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{
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int cx, cy, rx, ry, x, y;
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int uQPctX10;
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RECT rcItem;
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HRGN hEllRect = NULL;
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HRGN hEllipticRgn = NULL;
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HRGN hRectRgn = NULL;
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HBRUSH hBrush = NULL;
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HBRUSH hOldBrush;
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HPEN hPen = NULL;
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HPEN hOldPen = NULL;
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rcItem = *lprcItem;
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rcItem.left = lprcItem->left;
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rcItem.top = lprcItem->top;
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rcItem.right = lprcItem->right - rcItem.left;
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rcItem.bottom = lprcItem->bottom - rcItem.top - uOffset;
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rx = rcItem.right / 2;
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cx = rcItem.left + rx;
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ry = rcItem.bottom / 2;
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cy = rcItem.top + ry;
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if (rx<=10 || ry<=10)
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{
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return;
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}
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rcItem.right = rcItem.left+2*rx;
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rcItem.bottom = rcItem.top+2*ry;
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if (uPctX10 > 1000)
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{
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uPctX10 = 1000;
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}
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/* Translate to first quadrant of a Cartesian system
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*/
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uQPctX10 = (uPctX10 % 500) - 250;
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if (uQPctX10 < 0)
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{
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uQPctX10 = -uQPctX10;
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}
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/* Calc x and y. I am trying to make the area be the right percentage.
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** I don't know how to calculate the area of a pie slice exactly, so I
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** approximate it by using the triangle area instead.
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*/
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if (uQPctX10 < 120)
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{
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x = IntSqrt(((DWORD)rx*(DWORD)rx*(DWORD)uQPctX10*(DWORD)uQPctX10)
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/((DWORD)uQPctX10*(DWORD)uQPctX10+(250L-(DWORD)uQPctX10)*(250L-(DWORD)uQPctX10)));
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y = IntSqrt(((DWORD)rx*(DWORD)rx-(DWORD)x*(DWORD)x)*(DWORD)ry*(DWORD)ry/((DWORD)rx*(DWORD)rx));
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}
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else
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{
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y = IntSqrt((DWORD)ry*(DWORD)ry*(250L-(DWORD)uQPctX10)*(250L-(DWORD)uQPctX10)
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/((DWORD)uQPctX10*(DWORD)uQPctX10+(250L-(DWORD)uQPctX10)*(250L-(DWORD)uQPctX10)));
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x = IntSqrt(((DWORD)ry*(DWORD)ry-(DWORD)y*(DWORD)y)*(DWORD)rx*(DWORD)rx/((DWORD)ry*(DWORD)ry));
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}
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/* Switch on the actual quadrant
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*/
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switch (uPctX10 / 250)
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{
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case 1:
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y = -y;
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break;
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case 2:
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break;
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case 3:
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x = -x;
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break;
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default: // case 0 and case 4
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x = -x;
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y = -y;
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break;
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}
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/* Now adjust for the center.
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*/
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x += cx;
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y += cy;
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/* Draw the shadows using regions (to reduce flicker).
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*/
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hEllipticRgn = CreateEllipticRgnIndirect(&rcItem);
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if (hEllipticRgn == NULL) {
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goto Cleanup;
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}
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OffsetRgn(hEllipticRgn, 0, uOffset);
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hEllRect = CreateRectRgn(rcItem.left, cy, rcItem.right, cy+uOffset);
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if (hEllRect == NULL) {
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goto Cleanup;
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}
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hRectRgn = CreateRectRgn(0, 0, 0, 0);
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if (hRectRgn == NULL) {
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goto Cleanup;
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}
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CombineRgn(hRectRgn, hEllipticRgn, hEllRect, RGN_OR);
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OffsetRgn(hEllipticRgn, 0, -(int)uOffset);
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CombineRgn(hEllRect, hRectRgn, hEllipticRgn, RGN_DIFF);
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/* Always draw the whole area in the free shadow/
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*/
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hBrush = CreateSolidBrush(lpColors[DP_FREESHADOW]);
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if (hBrush)
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{
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FillRgn(hDC, hEllRect, hBrush);
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DeleteObject(hBrush);
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hBrush = NULL;
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}
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/* Draw the used shadow only if the disk is at least half used.
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*/
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if (uPctX10>500 && (hBrush=CreateSolidBrush(lpColors[DP_USEDSHADOW]))!=NULL)
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{
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DeleteObject(hRectRgn);
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hRectRgn = CreateRectRgn(x, cy, rcItem.right, lprcItem->bottom);
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if (hRectRgn == NULL) {
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goto Cleanup;
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}
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CombineRgn(hEllipticRgn, hEllRect, hRectRgn, RGN_AND);
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FillRgn(hDC, hEllipticRgn, hBrush);
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DeleteObject(hBrush);
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hBrush = NULL;
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}
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hPen = CreatePen(PS_SOLID, 1, GetSysColor(COLOR_WINDOWFRAME));
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if (hPen == NULL) {
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goto Cleanup;
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}
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hOldPen = SelectObject(hDC, hPen);
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if((uPctX10 < 100) && (cy == y))
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{
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hBrush = CreateSolidBrush(lpColors[DP_FREECOLOR]);
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if (hBrush == NULL) {
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goto Cleanup;
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}
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hOldBrush = SelectObject(hDC, hBrush);
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if((TrueZr100 == FALSE) || (uPctX10 != 0))
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{
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Pie(hDC, rcItem.left, rcItem.top, rcItem.right, rcItem.bottom,
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rcItem.left, cy, x, y);
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}
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else
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{
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Ellipse(hDC, rcItem.left, rcItem.top, rcItem.right,
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rcItem.bottom);
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}
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}
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else if((uPctX10 > (1000 - 100)) && (cy == y))
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{
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hBrush = CreateSolidBrush(lpColors[DP_USEDCOLOR]);
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if (hBrush == NULL) {
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goto Cleanup;
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}
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hOldBrush = SelectObject(hDC, hBrush);
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if((TrueZr100 == FALSE) || (uPctX10 != 1000))
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{
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Pie(hDC, rcItem.left, rcItem.top, rcItem.right, rcItem.bottom,
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rcItem.left, cy, x, y);
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}
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else
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{
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Ellipse(hDC, rcItem.left, rcItem.top, rcItem.right,
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rcItem.bottom);
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}
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}
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else
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{
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hBrush = CreateSolidBrush(lpColors[DP_USEDCOLOR]);
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if (hBrush == NULL) {
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goto Cleanup;
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}
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hOldBrush = SelectObject(hDC, hBrush);
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Ellipse(hDC, rcItem.left, rcItem.top, rcItem.right, rcItem.bottom);
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SelectObject(hDC, hOldBrush);
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DeleteObject(hBrush);
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hBrush = NULL;
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hBrush = CreateSolidBrush(lpColors[DP_FREECOLOR]);
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if (hBrush == NULL) {
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goto Cleanup;
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}
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hOldBrush = SelectObject(hDC, hBrush);
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Pie(hDC, rcItem.left, rcItem.top, rcItem.right, rcItem.bottom,
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rcItem.left, cy, x, y);
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}
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SelectObject(hDC, hOldBrush);
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DeleteObject(hBrush);
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hBrush = NULL;
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/* Do not draw the lines if the %age is truely 0 or 100 (completely
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** empty disk or completly full disk)
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*/
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if((TrueZr100 == FALSE) || ((uPctX10 != 0) && (uPctX10 != 1000)))
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{
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Arc(hDC, rcItem.left, rcItem.top+uOffset, rcItem.right, rcItem.bottom+uOffset,
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rcItem.left, cy+uOffset, rcItem.right, cy+uOffset-1);
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MoveTo(hDC, rcItem.left, cy);
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LineTo(hDC, rcItem.left, cy+uOffset);
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MoveTo(hDC, rcItem.right-1, cy);
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LineTo(hDC, rcItem.right-1, cy+uOffset);
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if (uPctX10 > 500)
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{
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MoveTo(hDC, x, y);
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LineTo(hDC, x, y+uOffset);
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}
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}
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SelectObject(hDC, hOldPen);
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Cleanup:
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if (hRectRgn) {
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DeleteObject(hRectRgn);
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}
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if (hEllipticRgn) {
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DeleteObject(hEllipticRgn);
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}
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if (hEllRect) {
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DeleteObject(hEllRect);
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}
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if (hPen) {
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DeleteObject(hPen);
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}
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if (hBrush) {
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DeleteObject(hBrush);
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}
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return;
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}
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