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99 lines
2.5 KiB
C++
99 lines
2.5 KiB
C++
#include "ScanLine.h"
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inline int Cv(double x)
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{
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return int(x * 256 + 0.5);
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}
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void Rasterizer::CvLine(double x1, double y1, double x2, double y2)
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{
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LineRaw(Cv(x1), Cv(y1), Cv(x2), Cv(y2));
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}
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void Rasterizer::LineClip(double x1, double y1, double x2, double y2)
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{
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if(y1 < cliprect.top) {
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if(y2 < cliprect.top)
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return;
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x1 = (x2 - x1) * (cliprect.top - y1) / (y2 - y1) + x1;
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y1 = cliprect.top;
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}
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else
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if(y1 > cliprect.bottom) {
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if(y2 > cliprect.bottom)
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return;
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x1 = (x2 - x1) * (cliprect.bottom - y1) / (y2 - y1) + x1;
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y1 = cliprect.bottom;
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}
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if(y2 < cliprect.top) {
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x2 = (x2 - x1) * (cliprect.top - y1) / (y2 - y1) + x1;
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y2 = cliprect.top;
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}
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else
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if(y2 > cliprect.bottom) {
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x2 = (x2 - x1) * (cliprect.bottom - y1) / (y2 - y1) + x1;
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y2 = cliprect.bottom;
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}
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double y, yy;
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if(x1 < cliprect.left) {
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if(x2 < cliprect.left) {
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CvLine(cliprect.left, y1, cliprect.left, y2);
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return;
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}
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y = (y2 - y1) * (cliprect.left - x1) / (x2 - x1) + y1;
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if(x2 > cliprect.right) {
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yy = (y2 - y1) * (cliprect.right - x1) / (x2 - x1) + y1;
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CvLine(cliprect.left, y1, cliprect.left, y);
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CvLine(cliprect.left, y, cliprect.right, yy);
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CvLine(cliprect.right, yy, cliprect.right, y2);
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return;
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}
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CvLine(cliprect.left, y1, cliprect.left, y);
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CvLine(cliprect.left, y, x2, y2);
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return;
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}
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else
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if(x1 > cliprect.right) {
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if(x2 > cliprect.right) {
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CvLine(cliprect.right, y1, cliprect.right, y2);
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return;
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}
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y = (y2 - y1) * (cliprect.right - x1) / (x2 - x1) + y1;
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if(x2 < cliprect.left) {
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yy = (y2 - y1) * (cliprect.left - x1) / (x2 - x1) + y1;
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CvLine(cliprect.right, y1, cliprect.right, y);
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CvLine(cliprect.right, y, cliprect.left, yy);
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CvLine(cliprect.left, yy, cliprect.left, y2);
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return;
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}
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CvLine(cliprect.right, y1, cliprect.right, y);
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CvLine(cliprect.right, y, x2, y2);
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return;
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}
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if(x2 < cliprect.left) {
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y = (y2 - y1) * (cliprect.left - x1) / (x2 - x1) + y1;
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CvLine(x1, y1, cliprect.left, y);
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CvLine(cliprect.left, y, cliprect.left, y2);
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return;
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}
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else
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if(x2 > cliprect.right) {
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y = (y2 - y1) * (cliprect.right - x1) / (x2 - x1) + y1;
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CvLine(x1, y1, cliprect.right, y);
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CvLine(cliprect.right, y, cliprect.right, y2);
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return;
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}
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CvLine(x1, y1, x2, y2);
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}
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void Rasterizer::Move(const Pointf& p)
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{
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p0 = p;
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}
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void Rasterizer::Line(const Pointf& p)
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{
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PAINTER_TIMING("Line");
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LineClip(p0.x, p0.y, p.x, p.y);
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p0 = p;
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}
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