[英]How do I draw line (slanting line)?
How do I draw a non-orthogonal line? 如何绘制非正交线?
If we have an orthogonal line it's pretty easy: 如果我们有一条正交线,那很简单:
Consider X1 = 100, Y1 = 80; 考虑X1 = 100,Y1 = 80; And X2=100, Y2 = 185; 并且X2 = 100,Y2 = 185;
So we have something like this for this line. 因此,对于此行,我们有类似的内容。
for(nRow = Y1; nRow < Y2; nRow++)
{
for(nCol = X1; nCol < X2; nCol++)
{
nPixPos = nRow*nEffectiveWidth+nCol*3;
Image[nPixPos] = 0 ; /// Image -> unsigned char * (BUFFER) || 0 -> Black COLOR
Image[nPixPos+1] = 0 ;
Image[nPixPos+2] = 0 ;
}
}
If I want to draw a non-orthogonal line such as: 如果要绘制非正交线,例如:
X1 = 100 , Y1 = 80 and X2 = 115 , Y2 = 185 X1 = 100,Y1 = 80和X2 = 115,Y2 = 185
How would I go about constructing a loop to draw this line? 我将如何构建一个循环来画这条线?
如果您不想使用抗锯齿,则可以选择Bresenham的算法,如果需要,可以选择Xiaolin-Wu的 算法 。
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