249 lines
7.2 KiB
C++
249 lines
7.2 KiB
C++
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//---------------------------------------------------------------------------
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// Gradient.cpp - gradient drawing support
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//---------------------------------------------------------------------------
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#include "stdafx.h"
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#include "Render.h"
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#include "Utils.h"
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#include "gradient.h"
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//---------------------------------------------------------------------------
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HRESULT PaintGradientRadialRect(HDC hdc, RECT &rcBand, int iPartCount,
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GRADIENTPART *pGradientParts)
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{
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if (iPartCount < 2)
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return MakeError32(E_INVALIDARG);
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int width = WIDTH(rcBand);
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int height = HEIGHT(rcBand);
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int radius = width;
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if (height > width)
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radius = height;
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radius = radius/2;
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int radiusOffset = 0;
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int ratioTotal = 0;
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UCHAR ratio;
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bool firstColor = true;
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COLORREF color, prevcolor = 0;
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for (int i=0; i <= iPartCount; i++) // go thru 1 extra time at end
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{
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if (i == iPartCount) // solid part of last color for remaining ratio
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{
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color = prevcolor;
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ratio = static_cast<UCHAR>(255 - ratioTotal);
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}
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else
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{
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color = RGBA2WINCOLOR(pGradientParts[i].Color);
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ratio = pGradientParts[i].Ratio;
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}
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if (firstColor)
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{
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prevcolor = color;
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firstColor = false;
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}
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int radius2 = radius*ratio/255;
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if (radius2)
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PaintGradientRadialBand(hdc, rcBand, radiusOffset, radius2, prevcolor, color);
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radiusOffset += radius2;
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prevcolor = color;
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ratioTotal += ratio;
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}
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return S_OK;
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}
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//---------------------------------------------------------------------------
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HRESULT PaintHorzGradient(HDC hdc, RECT &rcBand, int iPartCount,
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GRADIENTPART *pGradientParts)
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{
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if (iPartCount < 2)
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return MakeError32(E_INVALIDARG);
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int width = WIDTH(rcBand);
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int xoffset = rcBand.left;
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int ratioTotal = 0;
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UCHAR ratio;
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bool firstColor = true;
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COLORREF color, prevcolor = 0;
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for (int i=0; i <= iPartCount; i++) // go thru 1 extra time at end
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{
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if (i == iPartCount) // solid part of last color for remaining ratio
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{
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color = prevcolor;
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ratio = static_cast<UCHAR>(255 - ratioTotal);
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}
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else
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{
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color = RGBA2WINCOLOR(pGradientParts[i].Color);
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ratio = pGradientParts[i].Ratio;
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}
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if (firstColor)
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{
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prevcolor = color;
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firstColor = false;
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}
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int width2 = width*ratio/255;
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if (width2)
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{
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RECT rect2 = {xoffset, rcBand.top, xoffset+width2, rcBand.bottom};
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PaintGradientHorzBand(hdc, rect2, prevcolor, color);
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}
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xoffset += width2;
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prevcolor = color;
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ratioTotal += ratio;
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}
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return S_OK;
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}
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//---------------------------------------------------------------------------
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HRESULT PaintVertGradient(HDC hdc, RECT &rcBounds, int iPartCount,
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GRADIENTPART *pGradientParts)
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{
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if (iPartCount < 2)
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return MakeError32(E_INVALIDARG);
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int iHeight = HEIGHT(rcBounds);
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int yoffset = rcBounds.top;
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int ratioTotal = 0;
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UCHAR ratio;
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bool firstColor = true;
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COLORREF color, prevcolor = 0;
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for (int i=0; i <= iPartCount; i++) // go thru 1 extra time at end
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{
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if (i == iPartCount) // solid part of last color for remaining ratio
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{
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color = prevcolor;
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ratio = static_cast<UCHAR>(255 - ratioTotal);
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}
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else
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{
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color = RGBA2WINCOLOR(pGradientParts[i].Color);
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ratio = pGradientParts[i].Ratio;
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}
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if (firstColor)
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{
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prevcolor = color;
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firstColor = false;
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}
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int iHeight2 = iHeight*ratio/255;
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if (iHeight2)
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{
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RECT rect2 = {rcBounds.left, yoffset, rcBounds.right, yoffset+iHeight2};
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PaintGradientVertBand(hdc, rect2, prevcolor, color);
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}
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yoffset += iHeight2;
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prevcolor = color;
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ratioTotal += ratio;
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}
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return S_OK;
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}
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//---------------------------------------------------------------------------
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void DrawGradient(HDC hdc, RECT &rcBand, COLORREF color1, COLORREF color2, BOOL fHorz)
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{
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TRIVERTEX vert[2];
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GRADIENT_RECT gRect;
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vert[0].x = rcBand.left;
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vert[0].y = rcBand.top;
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vert[1].x = rcBand.right;
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vert[1].y = rcBand.bottom;
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// first vertex
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vert[0].Red = (USHORT)(GetRValue(color1) << 8);
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vert[0].Green = (USHORT)(GetGValue(color1) << 8);
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vert[0].Blue = (USHORT)(GetBValue(color1) << 8);
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vert[0].Alpha = 0x0000;
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// second vertex
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vert[1].Red = (USHORT)(GetRValue(color2) << 8);
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vert[1].Green = (USHORT)(GetGValue(color2) << 8);
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vert[1].Blue = (USHORT)(GetBValue(color2) << 8);
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vert[1].Alpha = 0x0000;
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gRect.UpperLeft = 0;
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gRect.LowerRight = 1;
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GdiGradientFill(hdc, vert, 2, &gRect, 1, fHorz ? GRADIENT_FILL_RECT_H : GRADIENT_FILL_RECT_V);
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}
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//---------------------------------------------------------------------------
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void PaintGradientHorzBand(HDC hdc, RECT &rcBand, COLORREF color1, COLORREF color2)
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{
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DrawGradient(hdc, rcBand, color1, color2, TRUE);
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}
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//---------------------------------------------------------------------------
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void PaintGradientVertBand(HDC hdc, RECT &rcBand, COLORREF color1, COLORREF color2)
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{
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DrawGradient(hdc, rcBand, color1, color2, FALSE);
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}
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//---------------------------------------------------------------------------
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void PaintGradientRadialBand(HDC hdc, RECT &rcBand, int radiusOffset,
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int radius, COLORREF color1, COLORREF color2)
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{
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int red1 = RED(color1);
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int red2 = RED(color2);
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int green1 = GREEN(color1);
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int green2 = GREEN(color2);
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int blue1 = BLUE(color1);
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int blue2 = BLUE(color2);
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int maxcolors = abs(red1 - red2);
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int cnt = abs(green1 - green2);
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if (cnt > maxcolors)
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maxcolors = cnt;
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cnt = abs(blue1 - blue2);
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if (cnt > maxcolors)
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maxcolors = cnt;
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int linewidth;
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if (color1 == color2) // just do solid color1
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linewidth = radius;
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else if (radius > maxcolors)
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linewidth = radius/maxcolors;
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else
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linewidth = 1;
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POINT center = {rcBand.left + WIDTH(rcBand)/2, rcBand.top + HEIGHT(rcBand)/2};
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radiusOffset += linewidth/2; // center pen within line
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for (int r=0; r < radius; r += linewidth)
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{
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int red = (red2*r + red1*(radius-r))/radius;
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int green = (green2*r + green1*(radius-r))/radius;
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int blue = (blue2*r + blue1*(radius-r))/radius;
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int radius2 = radiusOffset + r; // center pen within target line
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//---- calculate rcBand around "center" with "radius2" ----
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int left = center.x - radius2;
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int right = center.x + radius2;
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int top = center.y - radius2;
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int bottom = center.y + radius2;
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//---- overlap lines slightly so that bg doesn't leak thru ----
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HPEN pen = CreatePen(PS_SOLID, linewidth+2, RGB(red, green, blue));
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HPEN oldpen = (HPEN)SelectObject(hdc, pen);
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Arc(hdc, left, top, right, bottom, 0, 0, 0, 0);
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SelectObject(hdc, oldpen);
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DeleteObject(pen);
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}
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}
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//---------------------------------------------------------------------------
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