CODEWITHSUNDEEP
c#
user1166981
user1166981

Reputation: 1746

Strange arithmetic error with vectors

I am using DirectX to draw on screen.

I want to make the image about whilst keeping the dimensions, so I am assigning some arithmetic to the vertexes:

float boxPosFactorX = (869-3)+(100/100 * (1063 - 869));
float boxPosFactorY = (940-3)+(100/100 * (1038 - 940));



vertexes[0].Position = new Vector4((50 * boxScale) + boxPosFactorX, (50 * boxScale) +     boxPosFactorY, 0, 1.0f);

// other vertexes with same structure just different constants (e.g. 50 above is the constant values of that vertex.

Now here is the really weird part, the code above works as expected, but as soon as change the ratio "100/100" to anything below "99/100" or less, it behaves as if the code were:

float boxPosFactorX = (869-3)
float boxPosFactorY = (940-3)

Upvotes: 1

Views: 62

Answers (1)

Marc Gravell
Marc Gravell

Reputation: 1062492

99/100 is 0 (and 101/100 is exactly 1). That is integer arithmetic. If you want floating point arithmetic, use 99F/100.

Upvotes: 4

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