latest SDK

libPPUI/CMiddleDragImpl.cpp

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+#include "stdafx.h"
+#include "CMiddleDragImpl.h"
+
+double CMiddleDragCommon::myPow(double p_val, double p_exp) {
+	if (p_val < 0) {
+		return -pow(-p_val, p_exp);
+	} else {
+		return pow(p_val, p_exp);
+	}
+}
+
+double CMiddleDragCommon::ProcessMiddleDragDeltaInternal(double p_delta) {
+	p_delta *= (double)KTimerPeriod / 25; /*originally calculated for 25ms timer interval*/
+	return myPow(p_delta * 0.05, 2.0);
+}
+
+double CMiddleDragCommon::radiusHelper(double p_x, double p_y) {
+	return sqrt(p_x * p_x + p_y * p_y);
+}
+int CMiddleDragCommon::mySGN(LONG v) {
+	if (v > 0) return 1;
+	else if (v < 0) return -1;
+	else return 0;
+}
+
+int32_t CMiddleDragCommon::Round(double val, double & acc) {
+	val += acc;
+	int32_t ret = (int32_t)floor(val + 0.5);
+	acc = val - ret;
+	return ret;
+}
+
+LONG CMiddleDragCommon::LineToPixelsHelper(LONG & p_overflow, LONG p_pixels, LONG p_dpi, LONG p_lineWidth) {
+	const int lineWidth = MulDiv(p_lineWidth, p_dpi, 96);
+	if (lineWidth == 0) return 0;
+	p_overflow += p_pixels;
+	LONG ret = p_overflow / lineWidth;
+	p_overflow -= ret * lineWidth;
+	return ret;
+}